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Furnace doesn't reach desired temperature

Have Armstrong Ultra V furnace. It shuts off before thermostat setting. Have changed thermostats and new one does the same thing. Furnace starts and heats but stops after running without reaching setting then restarts after a few minutes but never heats to set temperature of 72 degrees. Room temperature ranges down to 67 up to 70. It does this with old and new thermostat.

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  • dsmith5115 Dec 21, 2008

    This is a 90% furnace. Does that contribute to the problm

  • Ken Bledsoe May 11, 2010

    Does your unit have a condensate pump that clears out the condensate from furnace. Or does the condensate just get piped out by pvc piping to a drain?

  • Ken Bledsoe May 11, 2010

    Do you change the filter regularly what I mean at least every two months? I am thinking the furnace is back building heat and shutting off on a limit safety switch. So have to eliminate some problems to narrow it down. ken

  • Anonymous Mar 20, 2014

    needs to be reset. desire location of manual reset auxiliary control button

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On the thermostat if its a manual on then pop the cover off and look for a small dial with numbers on it. Take and move it tpoi a higher number than whats it is set at. Its called a heat anticipater and is supppose to make it so that the unit does not oveshoot or under shoot like what your experiencing. If its a digital oine then you are going to have to configure the setting in the insdtallers menu.

Posted on Dec 21, 2008

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One of two things you can try. Do you own a volt ohm meter? Anytime your unit cycles short like it is doing the control circuit which on this one is 24 volts that engages relays and controls the gas valve to open and close. I am thinking the heat exchanger is getting so hot it is tripping the upper limit which for the most part is around 180 degrees. So next time it turns off take your ohm meter and with the power to the whole unit off. Either turn the breaker off or there is a light switch that is real close to unit turn it off. Undo the two wires to the gas valve and ohm them out. You should have continuity if you get nothing check each limit switch should have a couple. Undo wires to them and check. If you find one that is open more then likely the upper one. They are a safety device that keeps the unit from getting too hot.

There might be another option increase the speed of your fan motor to get the heat out of furnace quicker. Look at the circuit board notice the fan wiring going to it. The Red wire from fan is low speed look to see if it is on HEAT on the board. You should have 4 speeds to pick from you could take the black off of COOL and swap wires and test the unit by doing that. I'm going to put a solution on this so I can come back to it quicker. Even though we a just testing it for now. ken

Posted on Dec 21, 2008

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