Thermostat - Testing: Lower the Thermostat into a pan of boiling water, if the thermostat fails to open fully within a minute renew it. The thermostat should close as the water cools, again, if not renew it.
For further analysis to see weather the thermostat works opens at the correct temperature a thermometer should be used for a more precise reading. Make sure you have the correct specifications for the thermostat (at what temperatures it should be fully open) and use the thermometer to confirm / check the correct opening and or closing of the thermostat.
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