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Nest thermostat

ChickenLeg
ChickenLeg Member Posts: 8
edited October 27 in Thermostats and Controls

Nest thermostat was working. Unplugged to charge and service boiler. Now have code E195. Wires all connected and 27v at boiler

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,815

    Is the Nest hooked up two wire or three wire? Do you have a common "C" wire hooked to the Nest?

    ChickenLeg
  • jimna01
    jimna01 Member Posts: 46

    Howeowner and ex-nest user. What generation of nest thermostat do you have? As of 10/25 Google EOL’d gen 1 and 2 thermostats. They no longer connect to nest, there wireless connection no longer works and they can’t be configured remotely. It may also affect other operations

  • ChickenLeg
    ChickenLeg Member Posts: 8

    2 wire red and white. Saying no signal at R1

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,815

    For a Nest to operate properly and charge the internal batter you need a wire connected from the C terminal on the Nest to the common on your 24 volt transformer. See if your thermostat cable contains an extra wire, it may or may not and some pictures on the boiler end.

  • hevysrf
    hevysrf Member Posts: 5
    edited 1:49AM

    You can fry the MOSFETS in the sub base if you unplug the stat from the sub base with the power on.

    but E195 is "no power at R terminal"

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