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Models

Upright S-Series

Commercial Series

Refrigerated Kitchen Equipment

Service Manual

Number: 73207

Issued: 8-3-2015

Revised: 6-24-2016

hoshizakiamerica.com

WARNING

Only qualied service technicians should install and service the appliance. To

obtain the name and phone number of your local Hoshizaki Certied Service

Representative, visit www.hoshizaki.com. No service should be undertaken until

the technician has thoroughly read this Service Manual. Failure to service and

maintain the appliance in accordance with this manual will adversely affect safety,

performance, component life, and warranty coverage. Proper installation is the

responsibility of the installer. Product failure or property damage due to improper

installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the

service and maintenance of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily

addressed, please call, send an e-mail message, or write to the Hoshizaki Technical

Support Department for assistance.

Phone: 1-800-233-1940; (770) 487-2331

Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsupport@hoshizaki.com

HOSHIZAKI AMERICA, INC.

618 Highway 74 South

Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read

the warnings and guidelines contained in this manual carefully as they provide

essential information for the continued safe use, service, and maintenance of the

appliance. Retain this manual for any further reference that may be necessary.

CONTENTS

Important Safety Information 5 .................................................................................................

I. General Information 8 ............................................................................................................

A. Construction 8 ..................................................................................................................

B. Refrigeration Flow Chart ............................................................................................. 10

II. Sequence of Operation and Service Diagnosis ................................................................11

A. Sequence of Operation Flow Charts ............................................................................11

1a. Refrigerator Auxiliary Code F-6 and Earlier ..........................................................11

1b. Refrigerator: Auxiliary Code F-7 and Later ........................................................... 12

2a. Freezer: Auxiliary Code F-7 and Earlier ............................................................... 13

2b. Freezer: Auxiliary Code F-8 and Later ................................................................. 14

B. Service Diagnosis ....................................................................................................... 15

1a. Refrigerator: Auxiliary Code F-6 and Earlier ........................................................ 16

1b. Refrigerator: Auxiliary Code F-7 and Later ........................................................... 19

2a. Freezer: Auxiliary Code F-7 and Earlier 22 ...............................................................

2b. Freezer: Auxiliary Code F-8 and Later 27 .................................................................

C. Control Module Check 32 .................................................................................................

D. Thermistor Check ........................................................................................................ 34

E. Diagnostic Tables ........................................................................................................ 35

III. Controls and Adjustments 37 ...............................................................................................

A. Control Module 37 ............................................................................................................

1. Display Icons 37 ......................................................................................................

2. Display Layout 37 ....................................................................................................

3. Control Module Connections 38 ...............................................................................

B. Temperature ............................................................................................................... 39

1. Default Settings 39 ......................................................................................................

2. Temperature Setpoint ............................................................................................ 39

3. Changing the Temperature Display Scale ( F or C) 39° ° .............................................

C. Defrost 40 ........................................................................................................................

D. Alarm Safeties ............................................................................................................. 41

E. Safety Devices 42 ............................................................................................................

F. Mullion/Perimeter Heater 42 .............................................................................................

IV. Replacement of Components 43 .........................................................................................

A. Service for Refrigerant Lines 43 .......................................................................................

B. Important Notes for Component Replacement 46 ............................................................

C. Door Reversal 46 .............................................................................................................

V. Maintenance 47 ....................................................................................................................

VI. Preparing the Appliance for Periods of Non-Use 48 ............................................................

VII. Disposal 49 .........................................................................................................................

VIII. Technical Information .................................................................................................... 50

A. Electrical and Refrigerant Data 50 ...................................................................................

B. Wiring Diagrams .......................................................................................................... 51

1. CR1S-FS/FSL/HS/HSL Auxiliary Code E-5 and Earlier 51 .........................................

2. CR2S-FS/HS Auxiliary Code E-5 and Earlier 52 ........................................................

3. CR1S-FGY/FS/FSL/HS/HSL,

CR2S-FGY/FS/HS/FGY,

CR3S-FS/HS Auxiliary Code E-6 to F-6 53 ................................................................

4. CR1S-FGE/FGECL/FGECR/FS/FSL/HS/HSL,

CR2S-FGE/FS/HS Auxiliary Code F-7 and Later 54 ..................................................

5. CF1S-FS/FSL/HS/HSL Auxiliary Code E-5 and Earlier 55 .........................................

6. CF1S-FS/FSL/HS/HSL Auxiliary Code E-6 to F-7 56 .................................................

7. CF1S-FGE/FGECL/FGECR/FS/HS F-8 and Later 57 .................................................

8. CF2S-FS/HS Auxiliary Code E-5 and Earlier 58 .........................................................

9. CF2S-FS/FSL/HS/HSL Auxiliary Code E-6 to F-7 59 .................................................

10. CF2S-FGE/FGECL/FGECR/FS/FSL/HS/HSL Auxiliary Code F-8 and Later 60 .......

11. CR3S-FS/HS Receptacle Box Connection 61 ...........................................................

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could

result in death, serious injury, or damage to the appliance or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly

conceived. Any other use should be considered improper and therefore dangerous.

The manufacturer cannot be held responsible for injury or damage resulting from

improper, incorrect, and unreasonable use. Failure to service and maintain the

appliance in accordance with this manual will adversely affect safety, performance,

component life, and warranty coverage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic

precautions including the following:

• Only qualied service technicians should install and service the appliance.

• The appliance must be installed in accordance with applicable national, state, and

local codes and regulations.

• The appliance requires an independent power supply of proper capacity. Seethe

nameplate for electrical specications. Failure to use an independent power

supply of proper capacity can result in a tripped breaker, blown fuse, or damage

to existing wiring. This could lead to heat generation or re.

• To reduce the risk of electric shock, do not touch the plug or power switch with

damp hands.

• Make sure the power switch is in the "OFF" position before plugging in or

unplugging the appliance to reduce the risk of electric shock.

• Before servicing, move the power switch to the "OFF" position. Unplug the

appliance from the electrical outlet.

For 115VAC Models

• THE APPLIANCE MUST BE GROUNDED: The appliance is equipped with a

NEMA5-15 three-prong grounding plug to reduce the risk of potential shock

hazards. It must be plugged into a properly grounded, independent 3-prong wall

outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a

qualied electrician replace it with a properly grounded, independent 3-prong wall

outlet. Do not remove the ground prong from the plug and do not use an adapter

plug. Failure to follow these instructions may result in death, electric shock, or re.

WARNING, continued

For 208-230VAC Models

• THE APPLIANCE MUST BE GROUNDED: The appliance is equipped with a

NEMA L14-20 four-prong locking, grounding plug to reduce the risk of potential

shock hazards. It must be plugged into a properly grounded, independent 4-prong

wall outlet. If the outlet is a 3-prong outlet or a 4-prong non-locking outlet, it is your

personal responsibility to have a qualied electrician replace it with a properly

grounded, independent 4-prong locking wall outlet. Do not remove the ground

prong from the plug and do not use an adapter plug. After plugging in, twist the plug

clockwise to lock it into place. Failure to follow these instructions may result in death,

electric shock, or re.

For All Models

• The GREEN ground wire in the factory-installed power cord is connected to the

appliance. If it becomes necessary to remove or replace the power cord, be sure to

connect the power cord's ground wire.

• Do not use an extension cord.

• Do not use an appliance with a damaged power cord. The power cord should not

be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could

result in electric shock or re. To unplug the appliance, be sure to pull the plug, not

the cord, and do not jerk the cord. Before unplugging a 4-prong plug, rotate the plug

counter-clockwise to unlock it.

• Do not splash, pour, or spray water directly onto or into the appliance. This might

cause short circuit, electric shock, corrosion, or failure.

• Do not make any alterations to the appliance. Alterations could result in electric

shock, injury, re, or damage to the appliance.

• The appliance is not intended for use by persons (including children) with reduced

physical, sensory, or mental capabilities, or lack of experience and knowledge,

unless they have been given supervision or instruction concerning use of the

appliance by a person responsible for their safety.

• Children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance or door or allow children or animals to

do so. Do not climb into the appliance or allow children or animals to do so. Death or

serious injury could occur or the appliance could be damaged.

• Be careful not to pinch ngers when opening and closing the door. Be careful when

opening and closing the door when children are in the area.

• Open and close the doors with care. Doors opened too quickly or forcefully may

cause injury or damage to the appliance or surrounding equipment.

• Do not use combustible spray or place volatile or ammable substances near the

appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance

could cause harm to individuals or damage to the appliance.

• Do not throw anything onto the shelves or load any single shelf with more than

120lb. (54.5 kg) of product. They might fall off and cause injury.

WARNING, continued

• Do not place anything on top of the appliance. Foreign objects or moisture could

enter the appliance and result in electric shock or re.

• The appliance is designed only for temporary storage of food. Employ sanitary

methods. Use for any other purposes (for example, storage of chemicals or medical

supplies such as vaccine and serum) could cause deterioration of stored items.

• Do not block air inlets or outlets, otherwise cooling performance may be reduced.

• Do not tightly pack the cabinet. Allow some space between items to ensure good air

ow. Also allow space between items and interior surfaces.

• Do not put warm or hot foods in the cabinet. Let them cool rst, or they will raise the

cabinet temperature and could deteriorate other foods in the cabinet or overload the

appliance.

• All foods should be wrapped in plastic lm or stored in sealed containers. Otherwise

foods may dry up, pass their smells onto other foods, cause frost to develop, result

in poor appliance performance, or increase the likelihood of cross-contamination.

Certain dressings and food ingredients, if not stored in sealed containers, may

accelerate corrosion of the evaporator, resulting in failure.

• Do not store items near the air outlet. They might freeze up and crack or break

causing a risk of injury or contamination of other food.

NOTICE

• Protect the oor when moving the appliance to prevent damage to the oor.

• Keep ventilation openings, in the appliance enclosure or in the built-in structure,

clear of obstruction. Do not place anything on top of the appliance. Blockage of

airow could negatively affect performance and damage the appliance.

• To prevent deformation or cracks, do not spray insecticide onto the plastic parts or

let them come into contact with oil.

• To avoid damage to the gasket, use only the door handle when opening and closing.

I. General Information

A. Construction

1. Solid Door Models Condenser Fan Motor

Condenser

Control Module

Front Panel

Door

Gasket

Control Box

Power Switch

Door Lock

Model Shown: CR1S-FS

Light

Compressor

Power Cord

Door Switch

• Evaporator

• Cabinet Thermistor

• Defrost Thermistor

• Evaporator Fan Shroud

Thermostatic Expansion Valve

Condensate Pan

Pressure Relief Valve

Condensate Tube and Spring

2. Glass Door Models

Condenser Fan Motor

Condenser

Control Module

Front Panel

Door

Gasket

Control Box

Power Switch

Door Lock

Model Shown: CR2S-FGE

Compressor

Power Cord

• Evaporator

• Cabinet Thermistor

• Defrost Thermistor

• Evaporator Fan Shroud

Thermostatic Expansion Valve

Light Switch

(glass door

models only)

Condensate Pan

Pressure Relief

Valve

Condensate Tube

and Spring

LED Lights

FGE Glass

Door Models

Fluorescent Light Assembly:

FGY Glass Door Models

Fluorescent Light Ballast

Fluorescent

Light Mount

Fluorescent Light

Bulb Guard

Fluorescent Light

Bulb

Model Shown: CR2S-FGE

24VDC Driver

FGE Glass

Door Models

Evaporator Fans

(quantity depends on model)

Evaporator

Thermostatic

Expansion Valve

Compressor

Condensate Pan

High-Pressure Switch

Drier

Condenser Fan

Condenser

Defrost

Thermistor

Defrost Heater and

Defrost Thermostat

(freezer only)

Cabinet Thermistor

B. Refrigeration Flow Chart

20-min.

minimum

defrost

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Charts

1a. Refrigerator Auxiliary Code F-6 and Earlier

3. Cool Down Restart

Refrigerator Auxiliary Code F-6 and Earlier Sequence Flow Chart

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DTh-defrost thermistor

EvapFM-evaporator fan motor

1. Startup/Cool Down 2. Cool Down Achieved

Comp energized

ConFM energized

EvapFM energized

CTh in control

Slight

Delay at

Startup CTh cools

to 3°F (1.7°C)

below setpoint.

Factory default

36°F (2°C)

CTh warms

to 3°F (1.7°C)

above

setpoint

4. Defrost

2-hr defrost timer

terminates

EvapFM energized

Comp de-energized

ConFM de-energized

5. Defrost Termination

DTh warms to

40°F (4.4°C) or

1-hr maximum

defrost timer

terminates

Note:

a) EvapFM de-energizes when door is opened on -FS models and

when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 20-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) Temperature displayed during defrost.

DTh in control

Power On

EvapFM energized

Comp de-energized

ConFM de-energized

2-min. Comp off

timer starts

EvapFM energized

2-min. Comp on

timer starts

Comp energized

ConFM energized

EvapFM energized

Cycle Steps

1b. Refrigerator: Auxiliary Code F-7 and Later

3. Cool Down Restart

1. Startup/Cool Down 2. Cool Down Achieved

CTh in control

Slight

Delay at

Startup CTh cools to

3°F (1.7°C)

below setpoint.

Factory default

33°F (1°C)

CTh warms

to 3°F (1.7°C)

above setpoint

4. Defrost 5. Defrost Termination

Note:

a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 20-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) Temperature displayed during defrost.

Power on

2-min. Comp off

timer starts

2-min. Comp on

timer starts

2-hr defrost timer

terminates

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DTh-defrost thermistor

EvapFM-evaporator fan motor

20-min.

minimum

defrost

DTh in control

DTh warms to

44°F (6.6°C) or

1-hr maximum

defrost timer

terminates

Comp energized

ConFM energized

EvapFM energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

Comp energized

ConFM energized

EvapFM energized

Cycle Steps

Refrigerator Auxiliary Code F-7 and Later Sequence Flow Chart

2a. Freezer: Auxiliary Code F-7 and Earlier

Freezer Auxiliary Code F-7 and Earlier Sequence Flow Chart

3. Cool Down Restart

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DrH-drain heater

DTh-defrost thermistor

EvapFM-evaporator fan motor

MH-mullion heater

PH-perimeter heater

1. Startup/Cool Down 2. Cool Down Achieved

Comp energized

ConFM energized

EvapFM energized

MH energized

PH energized

CTh in control

Slight

Delay at

Startup

CTh cools to

3°F (1.7°C)

below setpoint.

Factory default

-4°F (-20°C)

CTh warms

to 3°F (1.7°C)

above setpoint

4. Defrost

EvapFM energized

MH energized

PH energized

Comp de-energized

ConFM de-energized

5. Defrost Termination

MH energized

PH energized

DH de-energized

DrH de-energized

After Delay:

Comp energized

ConFM energized

EvapFM energized

DTh warms to 59°F (15°C)

Note:

a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 5-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met.

g) 7-minute EvapFM delay timer starts when defrost termination temperature is met (3-minute delay timer when defrost initiated manually)

h) 18-minute temperature display delay timer starts when defrost termination temperature is met (15-minute delay timer when defrost

initiated manually).

DTh in control

Power on

DH energized

DrH energized

MH energized

PH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

2-min. Comp off

timer starts

MH energized

PH energized

2-min. Comp on

timer starts

4-hr. cumulative Comp run

time defrost timer starts

4-hr cumulative Comp run

time defrost timer terminates

2b. Freezer: Auxiliary Code F-8 and Later

3. Cool Down Restart

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DrH-drain heater

DTh-defrost thermistor

EvapFM-evaporator fan motor

MH-mullion heater

PH-perimeter heater

1. Startup/Cool Down 2. Cool Down Achieved

Comp energized

ConFM energized

DrH energized

EvapFM energized

MH energized

PH energized

CTh in control

Slight

Delay at

Startup

CTh cools to

3°F (1.7°C)

below setpoint.

Factory default

-4°F (-20°C)

CTh warms

to 3°F (1.7°C)

above setpoint

4. Defrost

Comp de-energized

ConFM de-energized

DrH energized

EvapFM de-energized

MH de-energized

PH de-energized

5. Defrost Termination

DH de-energized

DrH energized

After Delay:

Comp energized

ConFM energized

EvapFM energized

MH energized

PH energized

DTh warms to 45°F (7.2°C)

Note:

a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 5-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) 3-min. Comp/ConFM/MH/PH delay timer starts when defrost termination temperature is met.

g) 7-minute EvapFM delay timer starts when defrost termination temperature is met (3-minute delay timer when defrost initiated manually)

h) 18-minute temperature display delay timer starts when defrost termination temperature is met (15-minute delay timer when defrost

initiated manually).

DTh in control

Power on

DH energized

DrH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

MH de-energized

PH de-energized

2-min. Comp off

timer starts

2-min. Comp on

timer starts

5-hr. cumulative Comp run

time defrost timer starts

5-hr. cumulative Comp run

time defrost timer terminates

Freezer Auxiliary Code F-8 and Later Sequence Flow Chart

DrH energized

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service

personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• Make sure all food zones are clean after the appliance is serviced.

NOTICE

• This appliance is not intended for outdoor use.

• Normal operating ambient temperature:

– Refrigerators and Solid Door Freezers 45°F to 100°F (7.2°C to 38°C)

– Glass Door Freezers 45°F to 80°F (7.2°C to 27°C)

Operation of the appliance, for extended periods, outside of this normal

temperature range may affect appliance performance.

• The appliance must not be located next to ovens, grills, or other high heat

producing equipment.

• The appliance must not be located in a corrosive environment.

• Minimum Clearance:

Side RearTop

3" (8 cm) 12" (31 cm) 1" (3 cm)

The diagnostic procedure is a sequence check that allows you to diagnose the electrical

system and components. Before proceeding, check for correct installation and proper

voltage per nameplate. Always choose a neutral (W) to establish a good neutral

connection when checking high voltages. If the display is in alarm, see "III.D. Alarm

Safeties."

IMPORTANT

The maximum allowable voltage variation is ±10 percent of the nameplate rating.

115VAC is used as a reference voltage when checking voltage to components.

Voltage may vary depending on power supply.

1. Factory Default Settings:

a) Temperature Setpoint:

Model Auxiliary Code Temperature Setpoint

Refrigerator F-6 and Earlier 36°F (2°C)

F-7 and Later 33°F (1°C)

Freezer -4°F (-20°C) All

b) Temperature Display Scale: °F.

For further details, see "II.C. Control Module Check" or "III. Controls and Adjustments."

• There is a minimum 2-min. Comp on time and 2-min. Comp off time.

1) Move the power switch to the "OFF" position.

2) Unplug the appliance from the electrical outlet.

3) Remove the control box cover.

4) Plug the appliance back into the electrical outlet.

5) Move the power switch to the "ON" position.

6) Conrm 115VAC at the power switch. On 3-section models, also conrm proper supply

voltage at the receptacle box (115VAC for refrigerator/208-230VAC for freezer).

1a. Refrigerator: Auxiliary Code F-6 and Earlier

7) –There is a slight delay, cabinet temperature appears on display. Startup/Cool Down

Comp, ConFM, EvapFM, and MH energize. 2-hr defrost timer starts.

a) EvapFMDiagnosis : Conrm EvapFM energizes. If not, conrm doors are closed

and DS engaged. Next, check for 115VAC at DSR #8 (LBU or GY) to DSR #7(W).

If115VAC is not present, check DS continuity. If DS is engaged and contacts are

open, replace DS. If 115VAC is present, check for 115VAC at DSR #4(DBU) to

neutral (W). If115VAC is not present, check for 115VAC at DSR #6(BK or W/BU) to

neutral(W). If 115VAC is present at DSR #6 (BK or W/BU) to neutral (W) and not at

DSR#4(DBU) to neutral (W), replace DSR. If 115VAC is present at DSR #4 (DBU) to

neutral (W), check EvapFM blades for binding and EvapFM continuity.

b) Cabinet Light FGY (FGYCR and FGYCL) Diagnosis : Open the door and conrm

CLS is in the ON position. If not, move CLS to the ON position. CLS turns on. If

CLS does not turn on, check for 115VAC at both CLS (BK) wires to neutral(W). If

115VAC is present at 1 CLS(BK) wire and not at the other, conrm power supply

and continuity of CLS switch. If power supply is ok, check CLS continuity. IfCLS

is engaged and CLS switch is open, replace CLS. If CLS is engaged, contacts are

closed, and 115VAC is present at CLS(BK) and CL is not energized, replace CL.

FS/HS CL Diagnosis: Open the door (upper on HS) and conrm CL is energized.

Ifnot, with the door open, check for 115VAC at DSR #5 (BK) to neutral(W) and DSR

#1 (V or Y) to neutral(W). If115VAC is not present at DSR #5 (BK), conrm power

supply and continuity of power switch. If 115VAC is present at DSR #5 (BK) and not

present at DSR #1 (V or Y), check DS continuity. IfDS is disengaged and contacts

are closed (DSR energized), replace DS. If DSR is de-energized and 115VAC is

present at DSR#5(BK) and not at DSR #1 (V or Y) to neutral (W), replace DSR.

If 115VAC is present at DSR #1 (V or Y) and CL is not energized, replace CL.

c) : Cabinet temperature appears on display. If not, check for 115VACat CM Diagnosis

CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, check power switch,

power cord connections, and breaker/fuse. Conrm wiring connections are secure for

both CM L2 (BK) (power supply) and CMN3(W) (neutral). If 115VAC is present and

display is off, replace CM.

d) : Conrm Comp and ConFM energize. Ifnot, check for Comp and ConFM Diagnosis

115VAC at CM C1 (R or V) to neutral(W). If 115VAC is not present, check CTh status.

See "II.D.Thermistor Check." IfCTh ohm reading is in proper range, replace CM.

If115VAC is present at CM C1 (R or V) to neutral (W), check for 115VAC at CR #0

(GY or P) to CR#1(W). If 115VAC is not present, check continuity of HPS. If open,

allow time for HPS to reset (cut out: 300±10 PSIG, cut in: 190±20 PSIG). If HPS does

not reset, see "e) HPS Activation" below. IfHPS is closed and 115VAC is present,

check for 115VAC at CR#4(BK) and CR #6(R) to neutral (W). If 115VAC is present

at CR #4 (BK) and not at CR#6(R), replace CR. If115VAC is present at CR #6 (R)

to neutral (W) and ConFM is energized but Comp is not, give time for Comp internal

protector to cool and reset. Next, check Comp start capacitor, start relay, and Comp

motor windings. If Comp does not start, replace Comp. If ConFM is not energized,

check ConFM fan blades for binding and motor winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a

restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant

charge.

e) HPS Activation (cut out: 300±10 PSIG, cut in: 190±20 PSIG): Conrm ConFM

is energized and fan blade turns freely. Conrmcondenser coil is not clogged or

restricted. Conrm there are no restrictions in the refrigeration circuit (TXV and drier).

Let refrigeration circuit pressures equalize. IfHPS does not reset and pressures

are equalized, replace HPS. Ifpressures are not equalized, reclaim refrigerant and

diagnose refrigeration circuit restriction.

8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues.

Comp and ConFM de-energize. : Conrm Comp and ConFM de-energize. Diagnosis

If not, and Comp and ConFM were energized longer than 2 min., check CTh status.

See "II.D. Thermistor Check." If CTh ohm reading is in range and Comp and ConFM

continue longer than 2 min., check for 115VAC at CM C1 (R or V) to neutral(W).

If115VAC is present, replace CM. If 115VAC is not present and Comp and ConFM

continue, check for 115VAC at CR #1 (R or V). If 115VAC is present, replace CR.

9) –Cabinet temperature is displayed during defrost. There is a 20-min. minimum Defrost

defrost time, a 1-hr. maximum defrost time, and a 2-hr. minimum defrost interval.

1a) : 2-hr. defrost timer terminates. EvapFM continues. Comp and ConFM Time-Initiated

de-energize.

1b) Manually-Initiated: To initiate a manual defrost, press the manual defrost button

on display. Defrost icon turns on and, if energized, Comp and ConFM de-energize.

Cabinet temperature is displayed during defrost.

2) Defrost Termination: DTh warms to 40°F (4.4°C). EvapFM and MH continue. Comp

and ConFM energize.

Defrost Diagnosis :

1a) 2-hr. defrost timer terminates. Time-Initiation:

(1) : Conrm defrost icon turns on, "dEF" is displayed, and Comp CM Diagnosis

icon turns off. If not, replaceCM.

(2) Conrm Comp and ConFM de-energize. Comp and ConFM Diagnosis:

If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is present,

replace CM. If 115VAC is not present and Comp and ConFM continue, check

CR#6(R) to neutral (W). If 115VAC is present, replace CR.

1b) : After pressing the manual defrost button, check the following:Manual-Initiation

(1) : Conrm Comp icon turns off, defrost icon turns on, and "dEF" is CM Diagnosis

displayed. If not, replace CM.

(2) Conrm Comp and ConFM de-energize. Comp and ConFM Diagnosis:

If not, check for 115VAC at CM C1 (R or V) to neutral (W). If 115VAC is present,

replace CM. If 115VAC is not present and Comp and ConFM continue, check

CR#6(R) to neutral (W). If 115VAC is present, replace CR.

2) Defrost Temperature Termination: DTh warms to 40°F (4.4°C). If not, conrm

DTh status. See "II.D. Thermistor Check." If DTh is in proper range, have Comp and

ConFM energized? If not, see "7d) Comp and ConFM Diagnosis"above.

Legend: –cabinet light; –cabinet light switch (FGY); –control module; CL CLS CM

Comp–compressor; –condenser fan motor; –compressor relay; ConFM CR

CTh–cabinet thermistor; –door switch (FS/HS); –door switch relay DS DSR

(FS/HS); –defrost thermistor; –evaporator fan motors; DTh EvapFM

HPS–high-pressure switch; –thermostatic expansion valveTXV