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Does Wood Boiler Pump Run All The Time. He thinks it probably is a wiring fault. The thermostat wires come into the honeywell aquastat.
Does this help answer your question? Pressing the reset button had no effect. Disconnecting either of the 2 thermostat wires in the aquastat stopped the circulator pump from running.
Based on the short description of your system it sounds like you only have one zone or thermostat controlling the whole house. 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. However, we don't know whether your boiler is designed to maintain a minimum core temperature or not.
I turned off the temperature control and programmer but the pump continued to run. Pressing the reset button had no effect. It's a grundfos pump working with a potterton suprima 30l wall mounted fan assisted balanced flue gas boiler.
The motorized valves appear to both be operating correctly. 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 said this should be switched by the programmer/valves.
He thinks it probably is a wiring fault. Disconnecting either of the 2 thermostat wires in the aquastat stopped the circulator pump from running. 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.
