Water has started to run slowly from the Overflow? The pressure gaug
onthe boiler is indicating approx 3bar. I have de-pressurised th system and refilled to 1 bar bleed & bleed all raditors. The fillin key is removed.
Everything seemed ok but overnight the pressure rose again to 3 bar an the overflow is running again.
This is not covered in the fault diagnosis provided? my guess is tha the water divering valve is faulty.
has anyone had experience of this fault
-- MrMick
I would bet that your 'water-to-water' plate heat exchanger has got a leak. This is a twin chamber, one side of which contains the 'heated water' from your boiler, the other half contains mains pressure water which goes off to your hot tap. Turn on your hot tap, mains water goes through the plate heat exchanger, gets hot, then comes out of your tap! If there is a leak between the wall in the chamber, mains water (being of much higher pressure than 3 bar) will push its way into your heating circuit, thus raising the pressure. Empty your pressure, turn off your boiler at the mains before you go to work, if it has raised when you come home then the plate heat exchanger is definitely your problem.
Easy to change, order yourself a pressure relief valve at the same time though as this may continue to drip.
Angus
Thanks, Did that last night and after 2 hours pressure had increased to 2. bar. looking at the connections inside the boiler I see that the cold suppl goes through the diverter valve to the heat exchanger, is it possibl for the leak to be in the diverter and is there any way of confirmin if its diverter or heat exchanger?
Mic
-- MrMick
The diverter will leak to atmosphere along the shaft not into the other wet system
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