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Noheatpump
Community Member
since 2 weeks ago
2 weeks ago

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  • 1 Posts
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Fantom O/B Hest Pump Wire (E413)

2 weeks ago
I am replacing a nest learning thermostat gen 1 to gen 4. Wiring should be the exact same. we have a gas, furnace (wires W1 and W2) and electric air-conditioning system (wire Y1). I have no heat pump and so no wire is connected to O/B. Yet when I try...