Dkoss08
New Member
if anyone could give some ideas that would be great. I have a hot water boiler system that sometimes does not kick on when thermostat calls for heat. It is a 2 zone boiler system with two thermostats. The damper is in the always open position. When not running the water pressure is between 10-20psi when running it’s 30psi. I cleaned the tip off from excess carbon and the pilot lights just fine once the gas starts entering the system. I checked the voltage when the thermostat called for heat across the high voltage and it was 0 volts. When I check the B1 and B2 terminals in the aquastat and I get a reading of 20V... I thought it would be 24V. Attached is some pictures of the schematic. I am not sure if it has something to do with the gas valve coil or the block vent safety switch or possibly a wire that has a bad connection that doesn’t allow the boiler to kick on when the thermostat calls for heat. It can work for two weeks fine and then it won’t, I can always get it to start again usually by powering down the whole system and waiting a few mintues but I would like to fix the problem so that I don’t have to worry about the heater turning off and not restarting.
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