Question about Heating & Cooling
I have an Amana Gas Fired Furnace Model CCA24FCC. It recently started blowing cold air out of the vent registers in the house and would then shut off after a call for heat at the thermostat with the setting on Auto. In the ON setting the circulator fan just blows ambient temp air. Upon further investigation I found I have a blinking LED. It blinks three times. The manual says- pressure switch circuit not closed. That is the case because the induced draft blower is not spinning. When a call for heat occurs this fan should spin. The pressure switch is functioning- with the furnace off or not operational the switch has no continuity across its terminals. When I pull a slight vacuum on the switch, I can hear it move and then my ohmeter has continuity across it. The problem is the draft motor wont run. When the furnace is switched on or a call for heat occurs, I do not have any voltage at the induced draft blower motor terminals nor do I have voltage at the control unit terminals. Am I on the right track to replacing the control unit? By the way, I had skipped replacing my filters for a few months and they were really dirty when I replaced them today while diagnosing the furnace.
Your doing well just right. When the call for heat is on the draft motor gets a call from the board to come on. When this happens if no voltage is present at the motor then you ahve abad baord. Replace it.
Posted on Nov 28, 2009
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