I have columbia gas boiler that comes up when I crank up the thermostat, runs for 10-20 minutes and shuts off.
The last time I called the repair guys I know they cleared out the tube that leads to the PSI gauge in the pic. They told me they took the pipe under the gauge off, cleared it out, and then it ran no problem for a year.
The pressure reading on the gauge doesnt budge through the whole cycle of heating up and shutting off. Can someone shout out what role the curling pipe and gauge plays with the operation.
My guess is this some sort of override - it looking for an increase in pressure when the boiler gets hot, and has to register the pressure is increasing. But in my case the boiler gets hot, pipe is clogged, no pressure increase, boiler shuts off.
Here's a pic. I'm talking about the gauge in upper right that links to box with red wire.