GE Washer Error Code 1A/1B

The 1A and 1B codes on a GE washer indicate a thermistor error, meaning the water temperature sensor circuit is open or shorted. The control board cannot receive a valid temperature reading from the thermistor. This will typically stop the wash cycle from completing normally. The fix involves checking thermistor resistance, inspecting the wiring harness, and replacing the thermistor if needed.

It is not recommended to continue running the washer while this code is active. Without a functioning temperature sensor, the control board cannot properly regulate water temperature, which could result in incomplete wash cycles or incorrect water conditions for your laundry. Resolving the fault before resuming use is the safer approach.

A power reset may temporarily clear the code from the display, but the error will return if the underlying thermistor or wiring fault has not been corrected. The control board will detect the same out-of-range resistance reading as soon as the cycle begins and will trigger the fault again. A permanent fix requires diagnosing and repairing the thermistor circuit.

A knowledgeable DIYer can often resolve this code by checking the thermistor resistance with a multimeter and comparing the reading to the resistance table in the mini manual attached to the washer. If the wiring and connectors are intact but the thermistor reads open or shorted, replacing the thermistor is a straightforward repair. If the wiring harness is damaged, that repair requires more care but is still manageable with basic electrical skills.

If the repair only requires reseating a loose connector, there is no parts cost involved. A replacement thermistor typically costs in the range of $15 to $50 for the part alone. If a wiring harness section needs replacement, parts and labor combined can range from $100 to $250 depending on the technician's rates and harness availability. A control board replacement, if needed, is the most expensive scenario and can range from $150 to $400 or more.