I have an old Bryant heater and the burners won't stay on until the thermostat setting is reached. The blower stays on but the burners will cycle on and off in short intervals.

If it has one,, clean the flame senser

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Originally Posted by RaybonSanderson

I have an old Bryant heater and the burners wont stay on until the thermostat setting is reached. The blower stays on but the burners will cycle on and off in short intervals.

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It could be the three wire pilot safety. The can cause that problem.