Boiler does not fire up intermittently

[4EverNovice]

I have the following condition:

When the thermostat or hot water tank calls for heat, the circulator pump would turn on, but the boiler would not fire up. The pilot light is lit. I would have to turn the system off via shut-off switch, and when I turn it on, everything will work as it should.

This first happened in May of 2021. It has since happened once a month since October. I'm not sure where to start with troubleshooting. Any and all suggestions would be greatly appreciated and welcomed.

It is a three zone hydronic heating system running on a Weil-McLain gold CGa gas-fired water boiler. It is controlled by a Taco 3 Zone Switching Relay w/ Priority SR503-EXP-4. The switching replay was replaced in August.

 

[Sylvan]

My office is 4 blocks from Yonkers as we are in Riverdale


Shut the boiler switch and wait 3 minutes then turn it back on it should reset the circulator and main flame

 

[Sponsor]

 

[4EverNovice]

Shutting the boiler switch does indeed reset the boiler and it was fire up as intended. My question is what can I do to investigate why this is happening

 

[Sylvan]

I try not to give to much technical advice because of the liability. I try to keep it as simple as possible and just to get your service back on line . . .Good luck

 

[Fitter30]

Boiler should have a burner control with a blinking lite when a failure occurs. Label or wiring diagram should have for the blinking lite.

 

[John Gayewski]

Sounds like a relay issue, but that's a guess.