01-22-2024 01:11 PM
We have a 2019 Weil-McClane CGi Gold boiler that has always functioned well. We installed a Google Nest thermostat (two wires (red and white). This thermostat works fine, until it goes into Eco mode. Upon re-start it will send a signal to boiler to heat to say 66 degrees. However, it constantly cycles on and off, firing the igniter, turning on the exhaust, and running gas to the burner for a few seconds, but never staying lit. It does this over a period of several hours, before it eventually stays lit enough to heat the boiler and push hot water into our radiators.
This only occurs at night. I called a plumber, who came during the day, and he found no issues. I receive no errors from the Nest, and only see extensive heating usage reflecting the constant attempts to stay lit at night. If I cannot figure this out, I will have to go back to analog.
01-28-2024 10:08 AM
Hi NJMusicMan,
Uh-oh! Are you located in North America or Europe? Could you send us a wiring photo of your previous thermostat wire and a photo of how you connected the wires to the Nest Learning Thermostat? Alsom, kindly check on the following:
Let us know how it goes.
Best,
Zoe