I just wrote this on another post, trouble shoot your system,if you can get the probe, its not taped or glued down you can test the thermostat.
To test a thermostat put the probe in cold water, plug a lamp into the thermostat, and heat the water up, using a thermometer check the water temp when the lamp shuts off and compare it to the settings.
If the thermostat tests good turn the heat on, with a temp gun watch how the heat tape warms up.
Reply With Quote