Hi Mike681,
Oh no! Sorry to hear about that. Let me take a look at this for you. A few questions:
- Did you try using the Help Center or troubleshooter before contacting support? If so, which steps have you tried already?
- When did cooling last work?
- If newly installed
- Check compatibility using the Compatibility Checker tool.
- Gather all details of the old thermostat & HVAC system.
- Check the make and model of the cooling and heating system, including the make and model for the, fan-coil or air-handler units.
- Check if the HVAC system might be using a multi-speed or variable speed fan.
- If not newly installed, was it working before?
- Check for any recent changes to the HVAC system or servicing made.
- When was the last maintenance service and cleaning?
- Is this the first time you’re calling for cooling this year?
- If yes, did heating work without issues in the winter?
- What type of system do you have? (Heat Pump or conventional type)
- For Heat Pump:
- Did you check O/B wire configuration and tried changing the O-wire to B-wire configuration or vice versa?
- For conventional type:
- Did you verify if Fan and Heating still work?
- Did you turn off the power to your HVAC system?
- Are the breakers turned on?
- Did you recently experience a brownout or blackout?
- Did you have any construction or maintenance work done on your home?
- Do you have a photo of your old thermostat? Make sure your Nest Thermostat is wired correctly and verify that the display is receiving power.
- Do you see a power code on your thermostat?
- Have you set up a temperature schedule for your thermostat?
Also, gather the power readings of your Nest Learning Thermostat 3rd generation's power readings of Battery, VOC, VIN, and lIN under Settings > Technical Info > Power Info.
I'll look forward to your response.
Best,
Zoe
