Gas boiler stopped heating

Old 02-18-15, 03:33 AM
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Gas boiler stopped heating

I have a hot water baseboard heating system with a gas furnace. 1 zone. The furnace stops heating after a while. The pilot light remains lit. I can get it going again by turning the thermostat down and back up. When I do cycle the thermostat I do hear a clicking sound at the furnace (is this the ignitor?). They furnace seems to stop heating every night and every morning we wake to a cold house. Help!

an hour later, more information.....after restarting furnace this morning by cycling thermostat, it shut off again. So, I recycled thermostat again and it restarted. I took the front cover off and sat and monitored it. The outlet pipe quickly got hot, the return with the circulating pump was somewhat cool. I watched the temp/pressure gauge. As the temp rose, the circulating pump must have turned on because the return pipes got hot. However, I cannot say the pump was working, I could not detect minor vibration in it to verify it was pumping, though I know it is subtle. The temp gauge rose to 170, pressure barely moved from 20 to 22 psi, at 170 degrees the furnace burner shutoff. The thermostat is still well below the setting. Hope this additional information helps you point me in the right direction. Its cold outside, and inside too!

Last edited by 4Ceesins; 02-18-15 at 04:57 AM.
Old 02-18-15, 06:44 AM
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What model aquastat is on that boiler?
Can you use a Multi meter?
Old 02-18-15, 07:50 AM
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Not only the aquastat, but the complete make and model of the boiler itself.

We don't call hot water systems 'furnaces' by the way... but BOILERS . Furnaces are for scorching hot air.

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