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Hello, I need to know how many seconds the furnace is on before it goes off right away.
I need to know the approximate age of the furnace.
And I need to know if the furnace is heating the house or not.
I need all 3 bits of information to help diagnose the problem, we can go from there.
Hello again, the thermostat may be programmed incorrectly, for the wrong type of system compared to what you have, and the differential temperature set to the default of 0.5F when most systems work better at 1 to 1.5F temperature differential settings.
Looking into that range if issue will be step number 1, after that, it sounds like there might be wiring errors.
I need the brand and model number of the thermostat, it is stamped on the back after you gently pry the thermostat from its wall mount base.
We can go from there.
Hello again, a flaw has developed in the humidifier wiring, indeed if the water solenoid is going bad and sapping too much of the 24v power to the thermostats, it could cause the problem.
Let me know how it goes.