Try remove the thermostat and see what happens...

来源: 冬前 于 2023-02-25 07:18:13 [] [旧帖] [给我悄悄话] 阅读数 : (226 bytes)
回答: 空调冷热同时工作是什么原因 由 惨白的天使 于 2023-02-24 19:30:07

Without thermostat connected, both heating and cooling should be off.  If none is on, change thermostat.  If heating/cooling or both on, mostly control board problem, replacement board costs about $100.

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