How do I run diagnostics on my GE washer?

To run diagnostics on your GE washer to check error codes and test components, procedure depends on model but general method for most GE top-load and front-load washers like GTW465ASNWW and GFW650SSNWW is to enter service mode. First, clear current cycle: press and hold Start/Pause or Power button for 3 seconds to stop any running cycle and turn washer off, leave lid closed. Second, enter diagnostic mode: for many GE top-load washers, with washer off, turn cycle knob to 12 o'clock position, then press and hold Start and select buttons or turn knob in sequence like 3 clicks clockwise, 1 counterclockwise, 1 clockwise within 8 seconds, all lights will flash and display shows t01 or similar. For GE front-load washers, press and hold Spin and Temp buttons for 3 seconds until display shows service mode. Third, run automatic test: once in service mode, press Start to run automatic test that checks door lock, fill valves, drain pump, and spin, washer will display error codes like E22 for drain pump failure or E4 for door lock. Fourth, check error codes: after test, display shows last 10 error codes, write them down. Fifth, exit service mode: unplug washer for 1 minute or press Power. Always consult manual for your model as procedure varies, and if not comfortable, call technician. Diagnostics help identify failed pump or inlet valve that costs 40 to 100 dollars.