Gloworm Ultimate FF40 Boiler: The boiler won't fire up in heating mode but will fire up in hot water mode. I can only get the heating to come on by setting hot water as well. Have changed pumps, controller, thermostats and the valve. Convinced it must be something in the electrics somewhere in the boiler. Can you advise?
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The pilot is alight, but it doesn't fire up when the heating and/or hot water are switched on. I don't think there's a problem with the timer controls or thermostats as I can hear the pump running when it's supposed to be on, and the 3 ways valves move when turning the heating and hot water on and off, but the boiler won't fire into life.
I have a natural gas peerless boiler with a hot water radiator system that won't fire up with the thermostat all the way up. The pilot is lit. Coincidentally, it stopped working in the same day anothe … read more
In these hot water systems, once the radiator or baseboard convector is heated with the hot water, the cooled water is returned back to the boiler to be reheated, and the water circulation loop continues. Understanding the components of a hot water boiler helps you with basic troubleshooting steps.
Although the boiler will fire up when Central Heating is called for, it will not fire up when Hot Water is called for. The Drayton ZA5/679-2 (22mm) two port Zone Valve opens but the bolier will not fire up. The Zone Valve Casing feels quite hot whilst the water is cold, or cool. The Servo Motor must be working as the valve opens.
I also found out last night that the thermostat was not programmed correctly as it was programmed as a Heat / Cool type of system, but it really should be programmed as HEAT Only, and Hot Water Heating System. After i change the programming mode of the thermostat - the boiler still didnt fire up even with 80+.