Thermostat: Testing and Inspection

Thermostat Test

Replace the thermostat Thermostat Replacement if it is stuck in the open position at room temperature.

To test a closed thermostat:

1. Suspend the thermostat (A) in a container of water. Do not let the thermostat and the thermometer (B) touch the bottom of the hot container.

2. Heat the water, and check the temperature with a thermometer. Check the temperature when the thermostat first opens, then check the temperature again when the thermostat is fully open.

3. Measure the lift height of the thermostat when it is fully open. If the thermostat is not within the specification, replace it.

Standard Thermostat