System 2K boiler oddly fires briefly

KyleO

When the boiler is hot and circulating to the zone calling for heat, it will abruptly restart and fire the boiler for a second, then go back to normal.

Is my energy manager going bad? Is there a short? Any suggestions?

Video demonstrating the weird reboot:

https://youtu.be/--TOEeEDJ2Q?si=IBSaCzSIk2UfRqsi

Thanks in advance!

szwedj

@KyleO based on your video, I believe what you have is digital sensor that is intermittently losing its signal to the manager. In the video you have a zone that is calling and heating and the return is coming back at 170 deg so the burner is shut off based on return temp at the time. Then you see the temperature bars go out and the burner light comes on, and that because once the manager loses the temperature reading from the sensor, it will switch to service board mode where it fires the burner to run up on the high limit instead but then the sensor sends a temperature signal and the manager reads the 170 and turns the burner light back off. That is my best guess based on the short video. When you call your service company, I would suggest they bring a new sensor with them and we can verify it with the tech when they are on site.

KyleO

Thanks Joe