GE Dishwasher Error Code F97: Troubleshooting No Heat... | appliancefaults.com

Technical Background:

The F97 error code on a GE dishwasher indicates a problem with the heating circuit. The Main Control Unit (MCU) monitors the temperature sensor and heating element current. If the MCU detects that the water is not heating within a specified timeframe or that the heating element is not drawing the expected current, it will trigger the F97 error code. Voltage travels from the MCU to the heating element through relays and wiring harnesses. Feedback from the thermistor allows the MCU to regulate heating.

Symptoms:

The dishwasher runs its cycles, but the water remains cold, and dishes are not cleaned properly. The F97 error code is displayed on the control panel.

Possible Causes:

Faulty heating element
Defective temperature sensor (thermistor)
Open heating element wiring
Failed control board (MCU)
Low incoming voltage
Blown thermal fuse or high-limit thermostat

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the heating element at the bottom of the dishwasher tub. Using a multimeter set to Ohms, test the heating element for continuity. A reading of around 15-25 Ohms is normal. If the reading is open (OL), the element is faulty and needs replacement.
3

Locate the temperature sensor (thermistor), usually near the heating element. Test its resistance with a multimeter. Compare the reading to the service manual's temperature/resistance chart. Replace if out of spec.
4

Inspect the wiring to the heating element and thermistor for any breaks, burns, or loose connections. Repair or replace as needed. Use a 1/4-inch nut driver for access panels.
5

Check the incoming voltage at the dishwasher junction box with a multimeter set to AC Volts. You should read approximately 120V AC. If the voltage is significantly lower, check the breaker panel and wiring to the outlet.
6

Access the control board (MCU), often located behind the kickplate. Inspect the board for any burnt components or signs of damage. If the board is visibly damaged or all other components test good, replace the control board. Use a 5/16-inch socket for mounting screws.
7

Check the thermal fuse or high-limit thermostat (if equipped) for continuity. Replace if open.

Safety Warning:

Disconnect power to the dishwasher before performing any troubleshooting or repairs. Verify the power is off with a multimeter. Capacitors in the control board can store a dangerous charge. Lock Out/Tag Out (LOTO) procedures should be followed.

Prevention:

Periodically run a dishwasher cleaner through the machine to prevent mineral buildup on the heating element. Inspect the spray arms and filters regularly to ensure proper water circulation, which can affect heating efficiency.

Expert Tip:

After replacing the heating element or control board, run the dishwasher through a complete diagnostic cycle to ensure proper operation and clear any stored error codes. On some GE models, you can enter service mode by pressing and holding the 'Start' and 'Select Cycle' buttons simultaneously for 5 seconds.

Frequently Asked Questions

•What is the typical resistance range for a GE dishwasher heating element?

A healthy GE dishwasher heating element typically reads between 15 and 25 Ohms.

•Where is the thermistor usually located in a GE dishwasher?

The thermistor is usually located near the heating element, often attached to the bottom of the dishwasher tub or integrated into the heating element assembly.

•How can I access the control board in my GE dishwasher?

The control board is typically located behind the kickplate at the bottom front of the dishwasher. You may need to remove a few screws to access the control board housing.

GE Dishwasher Error Code F97: Troubleshooting No Heat Issue

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a GE dishwasher heating element?

•Where is the thermistor usually located in a GE dishwasher?

•How can I access the control board in my GE dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: