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Does Wood Boiler Pump Run All The Time. The tech when he cleaned the boiler had placed a pencil at times behind a switch in the aquastat to force the furnace to run. I turned off the temperature control and programmer but the pump continued to run.
Pressing the reset button had no effect. He said this should be switched by the programmer/valves. The tech when he cleaned the boiler had placed a pencil at times behind a switch in the aquastat to force the furnace to run.
Disconnecting either of the 2 thermostat wires in the aquastat stopped the circulator pump from running. He said this should be switched by the programmer/valves. The thermostat wires come into the honeywell aquastat.
The boiler itself is switching on and off correctly, presumably just keeping the water in it's internal loop at the correct temperature as heat is lost. The pump does not run 24/7, but appears to run all the time that the programmer is between it's on and off setting for the hot water. He thinks it probably is a wiring fault.
I turned off the temperature control and programmer but the pump continued to run. The boiler tripped out last night when i had it on the 24 hour setting to heat some water up. Pressing the reset button had no effect.
He said that there was 240v permamntly on the live return to the boiler and this would make the boiler pump run all the time. Does this help answer your question? It's a grundfos pump working with a potterton suprima 30l wall mounted fan assisted balanced flue gas boiler.
