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Blower fan runs continually with the thermostat removed or installed. This is a older carrier combined unit with a furnace. Control board installed is a HH84AA 011. Replaced the board with a new board and problem continues. Tried to find a fusible link, with no luck. No power to R and C. 120 v on PR-1 to PR-2 and 27 v at SEC-1 to SEC-2. Any suggestions? Bill

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  • excide Jun 25, 2008

    The blower fan continually runs all the time even when the thermostat is not calling. The ac supply is what feeds the control board that the thermostat controls. The blower runs with no control wires attached and the only way you can isolate it is by lifting wires. The ac and heat will not work in this condition. That was not the solution.

  • micksutliff Dec 10, 2008

    I have a day night furnace with the same problem and same control board number HH84AA 011 the BLOWER often stays on but not always, not sure if it's the board or one of the sensors. but sounds like same issue I am having I am going to clean board and replace ic ca3098 from intersil if I can find one!

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Your sensor to the fan is stuck in the closed position. This sensor kicks the fan on when a certain temp is reached in the heat chamber. It opens after cool down and apparently is stuck closed.

Posted on Jan 23, 2009

  • epilynn Jan 23, 2009

    actually it sounds like a bad transformer. This board requires 24vac to open the circuit to the blower motor. If no 24vac then it will run constantly. Check from terminal R To C on the board and ensure that you have 24vac if not you need a transformer

  • epilynn Jan 23, 2009

    Your transformer is bad this board needs 24vac to open the circuit to blower

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I had a similar problem but I changed the transformer and had 24volts to R and C and when I jumped R and G the blower would kick on. When I jumped R and W I heard a click and that was it. I'm leaning to it being a bad board

Posted on Nov 23, 2013

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Dear excide,
The blower fan is not controlled by thermostat. The thermostat only cuts off the supply to compressor when the desired temperature is attained.To switch off the fan you have to switch off the supply to ac.
ramesh22

Posted on Jun 25, 2008

  • Ramesh Kumar Jun 26, 2008

    Dear excide.

    I am sorry if my solution did not help you. As I understand the thermostate operate on temperature and it cuts off the supply to the compressor / heaters. The fan runs on mains.

    ramesh22

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