7 Year old glowworm swiftflow 80 (honeywell) has recently got a bit noisy and last week, out of the blue stopped heating either when the hot water is on or when the central heating is on. It sounded like a classic fan issue, so I've changed the fan for a new one. It worked straight away for about 5 minutes, but then stopped again. It came on again for 5 minutes after about 15 minutes of being off, and as of now comes on every now and again for the heating, but not as it should, but never for the hot water. Can anyone help from here. When the system has been off for a while, if a open up the hot water, i get scalding hot water for a second or two but then straight back to cold, even when the main nurner has not been on. The pilot light always stays on and never goes out.
I think that the pump stays on and can be heard vibrating a little but never goes off. The fan does go onand off as required when the burner cuts in, but when the burn dies out, the fan slows but the pump keeps going.
As a further note, I've checked the flow valve and the sensor is making a circuit when the hot water is pumped through.Also, the pressure on the pressure on the system seems to be going down quite quickly.
Hope someone can help.
I think that the pump stays on and can be heard vibrating a little but never goes off. The fan does go onand off as required when the burner cuts in, but when the burn dies out, the fan slows but the pump keeps going.
As a further note, I've checked the flow valve and the sensor is making a circuit when the hot water is pumped through.Also, the pressure on the pressure on the system seems to be going down quite quickly.
Hope someone can help.