GE Electronic Refrigerator AC Diagnostics Manual

8/10/2019 GE Electronic Refrigerator AC Diagnostics Manual

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Electronic Refrigerator Diagnostics



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Main Electronic Board

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Electronic Diagnostic Test Mode

All the GE electronic refrigerators have a Diagnostic Mode that is incorporated in the software in each

main electronic board. This Diagnostic Mode will test certain components and operate others.

To activate this diagnostic test feature on an electronic refrigerator, you will need a touch padcontrol with at least 5 key pads; otherwise you will have to install the additional diagnostic tool.






Enter the appropriate display numbers as shown on the chart in the

next slide by pressing the freezer Colder or Warmer pad and the fresh

food Colder or Warmer pad. Then press any pad to activate thatspecific test. Not all tests are available on all models. If no pads are

pressed for 30 minutes, the diagnostic mode will time out.




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The main board outputs both AC and DC voltages to the refrigerator components. The one half of the

board is AC inputs and outputs; while the other half of the board is DC inputs and outputs.

Note: Wiring connectors are not shown for a better view of the board.

AC DC




All “J” connectors are labeled on the main board, check the schematic for each model; since there may be some

differences depending on the model.

J7

J8

J9

J11

J2

J3

J1

J4

J15

J5




The main board is supplied with 120vac power between the J11 (L1) and J7 pin 9 (N) circuit.

All the other 120vac components can be measured from the J7 connector.

AC

J 7 - 9

J11



Main Electronic Board Testing – Line Voltage Input

For a dead refrigerator with interior light operation only, check the input voltage to the main board.

To test for 120vac for line voltage to the main board, place your meter leads as shown in the above example.

AC

M e t e r L e a d

J11

Brown Wire

M e t e r

L e a d

J7-9

Orange Wire



Main Electronic Board Testing DC Output

For DC voltage measurement, you will need to read between a DC common connection and the

connection for the specific DC component you are checking. DC commons can be found at either

J2 pin 3 or J4 pin 3. Checking J4-2 to J4-3 verifies the main board 12-13vdc output voltage.

DC

J2-3 (Common)

J4-3 (Common)




•Each DC component is connected at various plugs on the DC side of the board and operate on different DC

voltages.

•J1 for Thermistors, J2 for fans, J3 for the 3-Way Valve, and J15 for the inverter models.

•Remember to measure a DC voltage, you must measure from one of the DC common points: J2 pin 3 or J4 pin 3.

DC

J3 – 3-Way Valve

J2 - Fans

J 1 - T h e r m i s t o r s

J 1 5

- I n v e

r t e r



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Component problems?



• The main board receives Inputs fromvarious operations and makes

decisions based on those inputs.

• The main board initiates Outputs

(commands) by opening or closing

relays on the board.

• The main board does NOT receive

AC feedback to determine whether thecommands were followed.

• As an example, the board will close the

compressor relay for cooling, but the

board does not know whether the

compressor started running.

• The main board will retain the input

data if there is a power failure.





•The main board outputs both AC and DC voltages to the refrigerator components. One half of the

board is for DC inputs and outputs; while the other half of the board is for AC inputs and outputs.

•The black “boxes” in the above picture are relays that the board uses to control the AC components

(compressor, defrost heater, dispenser, water valve, etc.)

AC

DCAC Relays




All “J” connectors are labeled on the main board, check the schematic for each model; since there may be some

differences depending on the model.

Note: J8 is not used for inverter model compressors.

J8 – AC Compressor

J9 – Defrost Heater

J11 – Line Power

J7 – AC Inputs and

Outputs

J12 – Used for various

heater outputs




•The main board is supplied with 120vac in order for the main board to function. If the unit is dead you canmeasure the incoming AC power between the J11 brown (L1) and J7 pin 9 orange (N) circuit.

•If the fuse on the main board is open; it most likely failed from a utility power surge or power supply short

circuit on the main board; replace the main board.

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Testing the AC Compressor Circuit

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•If the compressor does not run (condenser fan on) - check for 120vac measured between J8

black (Comp) and J7 pin 9 orange (N). Diagnostic mode code 1-2.

•If the voltage checks ok at this point the main board is not the fault; check the compressor and

the cabinet wiring.

•If you hear the relay click and the run voltage is not present replace the main board.


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•If the compressor does not run, unplug the refrigerator and check for resistance between

J8 black and J7 pin 9 orange (N). Refer to the specific diagram for resistance value.

•If the circuit reads open at this point; check the compressor and the cabinet wiring.

•Check the J8 black wire to cabinet ground to check for a grounded compressor; which may have

damaged the compressor relay on the main board.




•If the compressor resistance between J8 black and J7 pin 9 orange (N) checks good and is not

shorted to ground attempt to direct test the compressor.

•If your volt/ohm meter has an Ammeter function, set the meter for amps and check across the J8

black to the J11 brown to attempt to start the compressor by bypassing the main board. If the

compressor runs, replace the main board.

Note: Be sure to set your meter back to AC volts if your going to perform further voltage tests.


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Testing the AC Defrost Circuit

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The defrost heater receives 120vac measured between J9 blue and J7 orange pin 9 (N). If you read

120vac in this test, check the defrost heater and safety thermostat circuit. Diagnostic mode 1-4.

You can also clamp an amp probe around the JK L@6> wire to verify the heater is on and holding current.

Testing the AC Defrost Heater Circuit



An alternate test without diagnostic mode would be to set your meter for amperage and test from JK L@6>to the J11 brown line in. If the defrost heater comes on and holds current, replace the main board.

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Testing the AC Defrost Heater Circuit



Testing the AC Dispenser Functions

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Testing the AC Ice Dispenser

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Testing the AC Water Dispenser

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GE Electronic Refrigerator AC Diagnostics Manual