2. Gradually heat the water and determine the opening temperature of the thermostat valve.
Attention:
- If the thermostat valve is slightly open at normal temperature, replace it.
- Because the heating of the sensitive part of the thermostat lags slightly behind the heating of the water, hold for approx. 5 minutes. at approx. 93°C, and then measure the valve lift.
- Lower the thermostat into the water so that it does not touch the bottom of the container.