error code e102.

[Dianefam]

I had my unit turned off, but turned on the heat this morning and got an error code after 10 min, does this mean I need a new thermostat?  Or there is an actual issue with my system?  Everything was working perfection prior to this.  My nest is about 8 years old now

[zoeuvre]

Hi Dianefam, 

Yikes! I'm sorry to hear that your thermostat gave you an E102 error. E102 error means overcurrent to W1 wire. An overcurrent error on the thermostat is an indicator that the electrical current on the thermostat wires connected to the Nest Thermostat has spiked multiple times, causing the internal breakers of the thermostat to activate in order to protect the thermostat base plate and system components from damage. In this case, I highly recommend you contact a pro to service your system and fix this issue. 

Let us know how it goes.

Best,

Zoe