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I have a Burnham # 205ncl gas boiler.It is a cold start boiler that only come on when a zone calls for heat.It has started to run without any of the three zone valves opening but the circulator is running. Forgot to mention it a hot water boiler
I eliminated the three zone valves by disconnecting the thermostat wires but still had the same problem. the control on the boiler is a honeywell r8582d 5001 with a r822u 1006 relay. replaced the relay and still the same problem any help or thoughts would be greatly appreciated