Why Does My Thermostat Say HEAT ON But There Is No Heat?
Jessica McKendreePublished:
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Jessica McKendree
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3 comments
Jose Mancera
The contact on the thermostat does not turn on my heater. All seems to be fine. With the thermostat set higher than room temperature, I can turn on my two wire low volt heater by short circuiting the mechanical thermostat. This happened with two new mechanical circuit thermostats. I can’t find what the problem is given that two new thermostats operate the same. The original thermostat is the same. Help please. Jose
Uzaima
Very informative, you cleared all my confusion regarding why thermostat say heat on but no heat is coming from system. Thanks alot
Greg Martin
I have a hydronic heating system. The furnace is up to temperature, several zones are calling for heat, and the circulator pump light is on. But there’s no heat in the house. The large pipe from the rear of the furnace that sends hot water to the baseboard radiators is cold when its temperature is measured a few feet from the furnace. The end of that pipe on the furnace is very hot. It appears that hot water is not flowing through the pipes. The system was recently repaired and was bled. Suggestions ?