The CH thermostat was turned down for the summer; when turned up to activate the CH, the boiler will only fire if the DHW is already on/coming on at same time as the heating.
Where the hot water is not on, the boiler makes no noises at all/no response. However the CH light iluminates on the valve and it hums/clicks quietly.
Any help greatly apreciated.
(my gut instinct is that it may be the EP2001 control not telling the boiler to fire)
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