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we have 7 wires... one being a "U" terminal... it's for ventilation of outside air to be mixed in with the inside air and from what I can see Nest is not compatible with a 7 wire system.
Sorry, there was a problem. Please try again later.Check your heaters wiring For either a redundant ground or a redundant positive That should be piggyback at the thermostat
Sorry, there was a problem. Please try again later.Nest Learning Thermostat may be able to support your 6-wire heating and cooling system. However, we recommend checking the Compatibility Checker tool on our support page to verify if your heating and cooling system is compatible with Nest Learning Thermostat. Check out this link: https://store.google.com/us/widget/compatibility/thermostat
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