Nest turns on heat when hot water comes on

[MarkDev]

Hi

When my hot water comes on the heat comes on in zone one (downstairs). I have two zones. One nest for each zone. It worked perfectly up to about 3 months ago. I have tried trouble shooting and reinstalled the software but no joy. My system has three switches, one for each zone and one for the hot water.

I would appreciate your advice.

Thanks

• Mark

[RenzJ]

Hi Mark, 

Thanks for posting here in the Google Nest Community. I'd be happy to take a look at this for you. Does your HVAC turn on when you call for heating in either of your zones? Also, have you tried checking each zone separately, like, for example, turning on zone two and not zone one (downstairs) and checking for the result?

I look forward to your response.

Best,

Renz