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Two identical systems in the home. Single stage heat, 2 stage cooling. Both were functioning fine with Nest installed for two months. Last Friday, I got an E103 error on the app as soon as cooling turns on. Tried a new thermostat - same error. Have rechecked the wiring - all ok. Regular Honeywell thermostat works the system fine. Have measured control transformer outputs - 27.8V... C to Y1 - 27.8V as well.
Upstairs unit wired exactly the same and works without issues.
Not sure at this point what else I can check. Talked with Nest support and they indicated that they think it’s an over current spike - but I can’t figure out where that would be coming from. Error is quite consistent and doesn’t clear itself.
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