GE PSC21MGM Technical Service Manual Download Page 55

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Thermistor Test

Run Service Diagnostic Test (0-7)

Thermistor test - see page 33 for entering

diagnostic mode

Do all thermistors available on specific

model pass diagnostic test?

Did diagnostic test show O?

( open sensor )

Check wiring connections for an open

circuit. If OK, replace thermistor.

Yes

Verify thermistors are within

proper range using

temperature/resistance chart

on page 54

Yes

Replace

main board

Yes

Did diagnostic test show S?

( shorted sensor )

Check wiring connections for a short

in the circuit. If OK, replace thermistor.

Yes

Did diagnostic test show B?

( bad 5VDC circuit )

Summary of Contents for PSC21MGM

Page 1: ......

Page 2: ...ersonal injury disconnect power before servicing this product If electrical power is required for diagnosis or test purposes disconnect the power immediately after performing the necessary checks RECO...

Page 3: ...Specifications 4 Nomenclature 5 Warranty Information 6 Operating Characteristics 7 General Locator Views 14 Mechanical Disassembly 16 Diagnostics 32 Component and Connector Locator Views 55 Schematics...

Page 4: ...rature setpoint type and have settings of 0 9 with 9 being the coldest temperature possible The new NO CLEAN condenser is serviceable from the rear and is designed to prevent the customer from having...

Page 5: ...ates with a standard three prong grounding wall receptacle to minimize the risk of electric shock hazard from this appliance The customer should have the wall receptacle and circuit checked by a quali...

Page 6: ...or Capacity 22 inches Minimum Equalized Pressure 70 F 48 PSIG 90 F 60 PSIG IMPORTANT SAFETY NOTICE This information is intended for use by individuals possessing adequate backgrounds of electrical ele...

Page 7: ...CONTRACT DERIVATIVE X REGIONAL DERIVATIVE ICEMAKER EXTERIOR B NON DISPENSER ICEMAKER READY D CUBED ICE WATER E CUBED CRUSHED ICE WATER F 6 MO FILTER CUBED CRUSHED ICE G 1 YR FILTER CUBED CRUSHED ICE I...

Page 8: ...a d e h t m o r F e s a h c r u p l a n i g i r o t r a p y n A s l i a f h c i h w e g d i r t r a c r e t l i f r e t a w g n i d u l c x e r o t a r e g i r f e r e h t f o s i h t g n i r u D p i...

Page 9: ...Cooling Operation Adaptive Defrost 9 Pre Chill Operation Adaptive Defrost 9 Defrost Heater Operation Adaptive Defrost 9 Dwell Period Adaptive Defrost 9 Post Dwell Adaptive Defrost 9 Liner Protection...

Page 10: ...8 degrees of temperature change per minute as determined by resistance change of sensor Abnormal Operating Characteristics Incorrect Operation Fresh food fan on and evaporator fan off Evaporator fan o...

Page 11: ...After the 5 minute dwell period the unit goes into post dwell Post Dwell Adaptive Defrost The post dwell period is designed to cool the evaporator before circulating air within the refrigerator This p...

Page 12: ...tored in the event of a power failure Door Alarm The DOOR ALARM pad is used to turn on and turn off the door alarm feature If the feature is on the DOOR ALARM LED will flash when the door is opened If...

Page 13: ...loaded arm located at the bottom of the cabinet for each door The arm provides a stop for the door when the door is partially open and automatically closes the door when the door is almost closed IMP...

Page 14: ...located at one end of the jelly roll condenser and a solid plate is located at the other end Air is drawn in through the outside diameter of the condenser and pulled out by the condenser fan The cond...

Page 15: ...J6 K7 PAN HTR K6 WATER AUGER K1 C CR K2 K4 COMP J4 1 8 J7 DEFROST COOLING PRE CHILL DEFROST HEATER ON TIME MINUTES COMPRESSOR RUN TIME MINUTES ACCUMULATED FF AND FRZ DOOR OPENINGS MINUTES THERMISTOR...

Page 16: ...ture Controls Temperature Controls Damper Damper Fresh Food Thermistor Thermistor Fresh Food Thermistor Freezer Light Switch Freezer Light Switch Evaporator Fan Evaporator Fan Evaporator Thermistor Th...

Page 17: ...ntrol Board Jelly Roll Condenser Jelly Roll Condenser Compressor Compressor Overload and Relay under cover Overload and Relay under cover Dryer Dryer Capacitor Capacitor Condenser Fan Condenser Fan Wa...

Page 18: ...ompartment Drawers 19 Fresh Food Compartment Lights 19 Water Filter 20 Fresh Food Fan and Mullion Damper 20 Deli Fresh Damper 21 Fresh Food Thermistors 21 Temperature Control Panel 22 Freezer Door Bin...

Page 19: ...Light 26 Evaporator Fan 26 Evaporator Thermistor 27 Defrost Thermostat 27 Defrost Heater 27 Evaporator Drip Pan 28 Evaporator 28 Freezer Thermistor 28 Condenser Fan 29 Main Processor Card 29 Water So...

Page 20: ...ull in an outward motion until the molded gasket separates from the door liner Fresh Food Compartment Quick Access Door The fresh food compartment allows access to the fresh food compartment without o...

Page 21: ...er items and pull out for easy access 1 Pull the shelf out until the shelf stop tab meets the compartment stop 2 Push the shelf stop tab down and pull the shelf out until it is removed GEA00928 Fresh...

Page 22: ...terclockwise and pull it down 2 To install the filter push it up while turning 1 2 turn clockwise Do not force the filter Fresh Food Fan and Mullion Damper The fresh food compartment fan is located un...

Page 23: ...nst the compartment and open the back cover 10 Disconnect the wire connections and remove the damper or fan Deli Fresh Damper The deli fresh damper is located at the bottom of the cold air ductwork It...

Page 24: ...located at the lower left and right hand corners of the card 7 Remove the card Freezer Door Bins The freezer door bins are located on the inside of the freezer door and tilt out to allow easy access...

Page 25: ...table The fresh food door can be adjusted to match the height of the freezer door IMPORTANT The refrigerator rollers must be adjusted correctly to ensure proper door closure Refer to the Roller Adjust...

Page 26: ...ion of the freezer compartment and sends a signal to the processor 1 With a small flat blade screwdriver unlock the locking tabs and pull the switch out until the wire connector is visible 2 Disconnec...

Page 27: ...in housing mounting screws 4 located at the four corners of the housing 2 Slide the housing forward until the connector is visible disconnect the connector and remove the unit from the housing GEA009...

Page 28: ...emaker bracket screws 4 located at the four corners of the bracket GEA00957 Screws Screws 2 Remove 1 4 in ice dispenser drive mounting bracket screws 2 and remove the brackets GEA00958 Screws Screws 3...

Page 29: ...to the top portion of the evaporator The thermostat sends temperature information to the processor The defrost heater must be replaced when replacing the thermostat 1 Remove the lower fan duct work fr...

Page 30: ...ube the capillary tube must be desoldered first 6 Desolder the capillary tube from the evaporator 7 Desolder the suction line Use a pair of pliers to hold the evaporator 8 Remove the evaporator 9 With...

Page 31: ...or to the card or the card will be destroyed 1 Secure power to the unit 2 Remove the 1 4 in processor card panel screws 10 and remove the panel 3 Disconnect the processor cable connectors 4 Remove the...

Page 32: ...30 Notes...

Page 33: ...31 Notes...

Page 34: ...ezer Normal diagnostic chart 45 Freezer Warm Fresh Food Normal diagnostic chart 46 Compressor Not Running diagnostic chart 47 Damper Door Not Opening or Not Closing diagnostic chart 48 Condenser Fan N...

Page 35: ...mber in s e s u a C e r u l i a F 1 e l b a T t n e m t r a p m o C r e z e e r F t n e m t r a p m o C d o o F h s e r F 5 1 e v o b A o t i e h n e r h a F r o t s i m r e h t r e z e e r f e c n a...

Page 36: ...e 1 5 to completely reset the system Enter code 1 6 to exit diagnostic mode The temperature control panel is reset automatically Unplug the refrigerator for at least 10 seconds Test mode will terminat...

Page 37: ...f i y a l p s i d Z F e h t n o P K O t o n f i y a l p s i d Z F e h t n o F 0 4 l o r t n o c n i a m o t d r a o b r e s n e p s i D n o i t a c i n u m m o c d r a o b K O f i y a l p s i d Z F e...

Page 38: ...the display If the unit is not equipped with the Quick Chill option the third thermistor quick chill will display a 0 and 3 audible beeps will sound at the temperature control panel This is not a fai...

Page 39: ...S ACCUMULATED FF AND FRZ DOOR OPENINGS MINUTES THERMISTOR INPUTS ENCODER INPUTS MODEL SELECT COMMUNICATION INPUT OUTPUT DAMPER COILS FAN OUTPUTS INPUTS PROCESSING UNIT 1 Blk 2 Red 3 Blu 4 Pur 5 Wht 1...

Page 40: ...7 Red 8 Not Used 9 Orn GEA00907 PAN_HTR AUGER N DFZ DFF OCH COMMON WATER CRUSHER QC K5 DEFROST K3 L1 COMP J8 J9 J4 J12 DEFR LINE 2 1 J6 K7 PAN HTR K6 WATER AUGER K1 C CR K2 K4 COMP J7 DEFROST COOLING...

Page 41: ...n i p 1 J 2 J 1 e u l B n a f r o t a r o p a v E r e t e m o h c a t C D V 3 6 3 n i p o t 1 n i p 2 J 2 J 2 e t i h W e u l B t u p n i n a F C D V 2 1 3 n i p o t 2 n i p 2 J 2 J 3 e t i h W n o m...

Page 42: ...V 0 6 e g a t l o V g n i l e v a r T 3 J 3 n w o r B e t i h W r e p m a D 3 n i p 4 J o t 3 n i p 3 J C D V 3 2 e g a t l o V g n i d n a t S C D V 0 6 e g a t l o V g n i l e v a r T 3 J 4 w o l l...

Page 43: ...v l a v r e t a W C A V 0 2 1 9 n i p 7 J o t 3 n i p 7 J 7 J 4 e t i h W d e R k c o l r e t n i r o t o m r e g u A C A V 0 2 1 9 n i p 7 J o t 4 n i p 7 J 7 J 5 e t i h W e u l B r e t a e h l l i...

Page 44: ...teps in thermistor test to determine problem No Repair wire and connection at 6 pin connector Yes Check dispenser and temperature control lights Do they work Yes No Unplug J2 connector from control bo...

Page 45: ...r fan running Is the compressor running Is the evaporator fan running Is the airflow within the freezer normal Run Service Diagnostics Test 1 4 Defrost system check see page 52 No Heavy Frost Go to Co...

Page 46: ...ycle Run service diagnostic test 1 0 Damper test see page 48 No Is the Fresh food fan running Run service diagnostic test 1 1 Fan test see page 51 No Yes Is the airflow within the Fresh Food normal Ye...

Page 47: ...e adjustment Low ambient Is the room temperature must be above 55 F Control settings OK Advise consumer of refrigerator specifications No Is damper closed Yes Go to Damper flowchart page 48 Damper sho...

Page 48: ...al Yes Look for blockage at vents or heavy frost on evaporator cover No Blockage Run Service Diagnostics Test 1 4 Defrost system check see page 52 Check sealed system Normal frost pattern on evaporato...

Page 49: ...heck temperature setting of unit Yes Check for 120VAC at connector J7 9 orange wire to TAB1 J11 Black wire Do you have 120VAC Direct test the compressor Did it start Replace compressor Yes No Check wi...

Page 50: ...00 ohms J3 1 to J3 2 400 ohms J3 3 to J3 4 Check for same resistance values at damper motor No Damper motor defective replace motor No Unplug refrigerator then power up Check for 6VDC from J3 1 to J3...

Page 51: ...e approximatelty 1 5K ohms to 3K ohms Does the condenser fan motor read open Does the condenser fan motor read shorted below 1K ohm Replace the condenser fan motor Repair wiring harness Check for volt...

Page 52: ...voltage at main board J2 Is there at least 12 VDC between pins 3 and 8 Yes Replace fan motor Yes Replace main board and fan motor No Repair wiring harness Yes Check wiring to Evaporator fan motor Chec...

Page 53: ...Measure the resistance directly at the fan motor Is the resistance approximatley ohms No Repair wiring harness Yes Does the fan motor read open Replace FF fan motor Yes No Does the FFfan motor read sh...

Page 54: ...in board Is 120 VAC present Yes Run Service Diagnostic Test 0 7 for thermistors Do thermistors pass test Check door ajar Customer usage numerous door openings Yes Repair wiring connections or replace...

Page 55: ...test show O open sensor No Check wiring connections for an open circuit If OK replace thermistor Yes Verify thermistors are within proper range using temperature resistance chart on page 54 Yes Repla...

Page 56: ...s e e r g e D e r u t a r e p m e T F s e e r g e D o l i K n i e c n a t s i s e R s m h O 0 4 0 4 k 8 6 6 1 5 3 1 3 k 5 0 2 1 0 3 2 2 k 8 8 5 2 3 1 k 5 6 0 2 4 k 4 8 4 5 1 5 k 4 6 3 0 1 4 1 k 6 7 2...

Page 57: ...aporator Fan Evaporator Fan Freezer Thermistor Freezer Thermistor Defrost Thermostat Defrost Thermostat Light Light Freezer Light Switch Freezer Light Switch Evaporator Thermistor Evaporator Thermisto...

Page 58: ...56 GEA00980 Fresh Food Light Switch Fresh Food Light Switch Damper Damper Fresh Food Lights Fresh Food Lights Fresh Food Thermistor Fresh Food Thermistor...

Page 59: ...ntrol Board Jelly Roll Condenser Jelly Roll Condenser Compressor Compressor Overload and Relay under cover Overload and Relay under cover Dryer Dryer Capacitor Capacitor Condenser Fan Condenser Fan Wa...

Page 60: ...RMISTOR INPUTS ENCODER INPUTS MODEL SELECT COMMUNICATION INPUT OUTPUT DAMPER COILS FAN OUTPUTS INPUTS PROCESSING UNIT 1 Blk 2 Red 3 Blu 4 Pur 5 Wht 1 Yel 2 Red Blk 3 Wht Brn 4 Blu Yel 1 Blu Red 2 Yel...

Page 61: ...FZ DFF OCH COMMON WATER CRUSHER QC K5 DEFROST K3 L1 COMP J8 J9 J4 J12 DEFR LINE 2 1 J6 K7 PAN HTR K6 WATER AUGER K1 C CR K2 K4 COMP J7 DEFROST COOLING PRE CHILL DOOR SWITCH INPUTS COMPRESSOR DEFROST O...

Page 62: ...60 Thermistor Locator GEA00765 J4 J3 J1 Evaporator Thermistor Located on Evaporator Freezer Thermistor Fresh Food Thermistors...

Page 63: ...61 Schematics...

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Page 65: ...63 Illustrated Parts Catalog Exploded views of PSS25MGMABB are for general reference Always refer to specific model for latest part information...

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Page 70: ...68 Ref No Part Number Description 228 WR85X10022 Low Side Assembly...

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