Hello Mada2023,
Thank you for taking the time to let us know about your inquiry.
The message code you're getting from your Nest Thermostat reports an overcurrent on the Y1 wire. This report is an indicator that the electrical current on your 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.
To isolate:
- What type of Nest Thermostat do you have?
- What is the make and model of your heating, ventilation, and air conditioning (HVAC) equipment?
- How many wires are there?
- How are they labeled?
- Are the power breakers on, and are you receiving power to your home?
- Are all the wires firmly seated in the terminals? (No loose or exposed wires.)
I'll look forward to your response.
Regards,
Mark
