When replacing the base motherboard, removal from the wall is necessary and power to the thermostat must be turned off. The tools required are the blue opening tools, spudger, and a #0 Phillips screwdriver.

  1. Before disassembling your Nest Thermostat, be sure that your HVAC system is powered off.
    • Before disassembling your Nest Thermostat, be sure that your HVAC system is powered off.

    • Grasp the display's metal outer ring with your fingers and pull directly away from the wall, leaving the base behind.

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  2. Remember to turn off the power to your HVAC system and the thermostat.
    • Remember to turn off the power to your HVAC system and the thermostat.

    • Disconnect all wires from the grey spring-loaded connectors. This can be done using your fingers.

    HOW do you disconnect the wires? I can't get them out!

    Beverley Brown - Reply

    Same here. It is like the springs are in a stuck position

    Bill Redfield - Reply

    I also can not dis-engage the wires. Feels like the springs are frozen closed.

    Bill Redfield - Reply

    Hold down the button on the end and the wire should be able to slide right out.

    Amber - Reply

    • Remove the two 40mm screws from the base of the thermostat using a #0 Phillips screw driver.

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    • Unsnap the base from the trim plate (if used) using a plastic opening tool.

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    • Turn the base over.

    • Remove the four 6 mm screws from the back of the base using a #0 Phillips screwdriver.

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    • Pry the base mother board open from the side using the a plastic opening tool.

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    • The base mother board is only held together by light adhesive.

    • Pry the baseboard from the bottom using the flat end of a spudger.

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To reassemble your device, follow these instructions in reverse order.

4 other people completed this guide.

Rachael Deptula

Member since: 09/03/2014

531 Reputation

1 Guide authored


USF Tampa, Team 11-5, Blackwell Fall 2014 Member of USF Tampa, Team 11-5, Blackwell Fall 2014


5 Members

6 Guides authored


Would like to know where I can get just the base motherboard.

wesbug - Reply

Where can we purchase replacement parts?

brettspradley - Reply

i want the baseboard.. where i can buy? pls help...

john gemora - Reply

Yep, my base unit lasted exactly 8 days, then it shorted out. The furnace repairman said he has seen it a couple of times, the base unit can't handle the current needed by the furnace so it goes poof. Back to Honeywell...

bbolen - Reply

No replacement parts from Nest, my base unit died and I have perfectly working thermostat but am forced to buy a new one cause I can't get the base unit on its own.

Adrian Ma - Reply

I have no clue why people like their thermostats to the degree that they do.. I am both an A/c professional and an Engineer. They use what is called an SCR or silicon controlled rectifier for their switching instead of a tiny relay. An SCR is very sensitive to a spark or voltage spike. Yes the thermostat is pretty cool and has some nice features. It is advanced electronics but using SMC's or Surface Mounted Components?? . Maybe that would work well in a shielded component. But NOT in something that is connected to long external wires. The consumer bought warranty is only one year. I have seen too many issues in the field with their overpriced toys. Not having parts for this Chinese made thermostat? Priceless.

Jon Reid - Reply

Hey Jon, I’m trying to repair my parent’s 2nd Gen Nest. It sends out “heat” and “cool” signal at the same time. Anyway I can replace a component on the motherboard?

Lizik -

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