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RUUD (Protech Model 500) Thermostat Single Stage Not Programable

The thermostat LED shows the heat is suppose to be running (little fan rotating in the lower left hand corner). However it is not. I have to keep turning the thermostat off and back to heat in order for the heat to come on. When it comes on, runs for a few minutes and shuts down before reaching the set temp. I have changed the batteries and still the same problem. Anyone help with this problem?

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Problem is not the thermostat, thermostat is an on-off switch that happens to work on temperature. Your furnace is locking out. cycling the heat off switch resets the micro-processor in the furnace. You need to diagnose the problem in the furnace, to go further we will need the model and approximate age of the unit

Posted on Dec 18, 2008

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