Hi,
I have A Carrier Weathermaker SX furnace, model 58sx040-cc. When the thermostat calls for heat the draft inducer motor turns on, then the burner ignites. After the burner has run for about 30-45 seconds, the blower motor is triggered and comes on, but the burner and inducer shut off. Then after a minute or two the blower shuts off and the process is repeated.
If I turn the fan on always instead of auto at the thermostat, the furance will run until the thermostat reaches the proper temp. and shuts off.
Any ideas?