What should I check first for GE dishwasher error C7?

Unplug the dishwasher for 3 minutes to reset the electronic control board, then restore power.

C7Medium

GE dishwasher error C7

C7 means the temperature sensor is bad.

Symptom
C7
Free checks
2 checks
Most likely cause
Temperature sensor failed

The 2 free checks

Start at the top. Unplug the machine first.

01
Unplug the dishwasher for 3 minutes to reset the electronic control board, then restore power.
02
If the code returns, check the wiring connections on the water temperature sensor.

What causes it

Listed most likely first.

Cause	How often	DIY
Temperature sensor failed	Most common	Call a pro
Electronic control board failed	—	Call a pro

If none of that fixed it

The stated remedy is to replace the temperature sensor, which sits inside the door and needs the door removed to reach the access panel.

Before you check anything

Disconnect the power first. Unplug the machine at the socket, or switch off its circuit at the consumer unit if it is hard-wired. Do this before opening any panel, reaching into a pump filter, or moving the appliance.
Turn off the water before disconnecting a hose, and have a towel and a shallow tray ready — a drain hose holds water even when the drum looks empty.
Gas, mains wiring and sealed refrigeration are for a qualified professional — in many countries that is a legal requirement, not advice. If you smell gas, do not touch any switch: leave, and call your gas emergency number from outside.
Stop if you smell burning, see scorched wiring, or find water near an electrical connection. None of those is a code to look up.

The checks on this page are the manufacturer’s own, rewritten and sourced, and they are reference information rather than a repair instruction for your particular machine. Model, age and installation all change what is safe to do. You are the one standing in front of it — if a step looks wrong for the machine you have, trust that and call a technician.