Step 6 · Remove Faulty Thermostat and Purchase Replacement

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Once you've identified a faulty thermostat, disconnect all its wires. It is typically held against the tank by spring-like metal clips. Gently pry the thermostat away from the tank to release it from the clips. Take the old thermostat with you to a plumbing supply or home improvement store. Purchase a new thermostat that is an exact match in size, shape, and electrical ratings. Do not use a substitute.