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mushing_madness's avatar
mushing_madness
Explorer
Jun 27, 2015

Rooftop AC Compressor works, fan blows low, even if on high

My Rooftop AC compressor is working and creating cold air, however, when I change my fan speed from low to high on the wall mount thermostat, the fan speed does not increase to high. Worked on high y...
Ivylog's avatar
Ivylog
Explorer III
Jun 27, 2015
I would try the auto position because with a big enough difference in the air temp some Tstats will go to high speed. Unfortunately it sounds like a bad relay on the control board.

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