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Gloworm Fuelsaver Complheat 65 / Unvented Hot Water Cylinder Hi Can you shed some light on this problem. The Boiler will function for 1 hr from cold, heating the rads and hot water. After this time when the boiler needs to 'fire up' the PCB neons will only light to number 3, number 4...

I have a Glowworm Fuelsaver Complheat 65, age unknown. I needed to isolate and remove a radiator from the living room whilst decorating. After completion the radiator was replaced and rad valves opened. Unfortunately it seems that I forgot to top up the system, and as a consequence after a day...