Armstrong furnace doesn't reach set temperature

friborg11 Posts: 1, Reputation: 1

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Jan 24, 2013, 08:09 AM

Armstrong furnace doesn't reach set temperature

My Armstrong 80 furnace will work fine for about 10-20 minutes then turns off before reaching desired temperature. Example: My new thermostat reads 62 but is set for 70 degrees. When furnace kicks on, it only stays on for about 10-20 minutes and increases room temp to 65. I can then toggle the thermostat so that this furnace kicks back on. I already cleaned the flame sensor which didn't seem to make a difference.

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