I have an aging ferroli Hawk II combi boiler and it has developed a fault. It had a loss of pressure, which it often does, but now I have refilled it no heating. The hot water is OK and the Pump is working but all that happens for heating is that the boiler fires for approx
In message , " snipped-for-privacy@scannex.co.uk" writes
Air lock ?
Pump problem (despite what you say). Air locks. detached impellor. Temperature sensor.
Main flow/return isolator(s) closed.
See SealedCH FAQ about the pressure.
know why. The day before I undid the screw on the outside of the pump and I can hear the pump stop, if i push in the hole with a screwdriver it starts. Bleed the heat exchanger and found no air. If I listen at the rads I can hear the pump pushing water so if it is the pump what else can I do to confirm this. The mother board has diagnostic LEDs to show whats going on and when working and power applied some should light, however I have never seen any of them lite. Checked temp sensor and 1K which corresponds to cold water in Rads, CH overheat thermostate closed. I think it could well have needed venting, which I did but never found any air. Just hope it keeps going Thanks
I think I will try and replace the pressure release vent valve which is causing the loss of pressure, how easy is it to replace. Thanks
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