it should be about 24 volts between "red" and "common". you can

来源: TDF樂在其中 于 2014-11-29 21:34:07 [] [旧帖] [给我悄悄话] 阅读数 : 0 (284 bytes)

it should be about 24 volts between "red" and "common". you can measure it at the control board. You can bypass thermostat at the control board to see if the system works. If it works, check your thermostat. If it doesn't work, it could be a number of other things going bad.

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