Hi,
Its a Worcester 35CDI MK2 combi, in our new house, installed about 5 years ago according to the paper work that was with it
The hot water was cutting in and out and with help from here I took off the secondary plate heat exchanger and de-scaled. This seemed to fix the problem.
We haven't moved in yet so when I left the house I turned it off to be safe. Now we're nearly in I've programmed it and left it to run twice a day to dry the house out.
The pressure rose quite high when it was hot so I released pressure from the PRV and it leaked, I replaced the PRV.
I have re-pressurised the expansion tank as it had no pressure at all and then released the air and no water came out. Re-pressurised it again and left for a couple of days and it seems to be holding pressure.
I have reduced the pressure in the CH to 0.5 bar and left the boiler off thinking if the HE is holed then the mains water pressure will leak through and raise the CH pressure, it didn't.
Now the Diverter valve seems to buzz when there is DHW demand and the hot water cycles with boiler lighting and shutting down as it did before.
if the boiler is left alone for a week or so the pressure when hot stays high enough to vent water but doesn't drop enough when cold to cause the boiler to not fire up from cold in the mornings. This suggests to me water is leaking across to be filling the CH. Is that a possibility anywhere other than the secondary HE?
I don't want to replace the HE and it make no difference as money is very tight and I'd have to borrow to buy it.
Any help greatly appreciated
Adam
Its a Worcester 35CDI MK2 combi, in our new house, installed about 5 years ago according to the paper work that was with it
The hot water was cutting in and out and with help from here I took off the secondary plate heat exchanger and de-scaled. This seemed to fix the problem.
We haven't moved in yet so when I left the house I turned it off to be safe. Now we're nearly in I've programmed it and left it to run twice a day to dry the house out.
The pressure rose quite high when it was hot so I released pressure from the PRV and it leaked, I replaced the PRV.
I have re-pressurised the expansion tank as it had no pressure at all and then released the air and no water came out. Re-pressurised it again and left for a couple of days and it seems to be holding pressure.
I have reduced the pressure in the CH to 0.5 bar and left the boiler off thinking if the HE is holed then the mains water pressure will leak through and raise the CH pressure, it didn't.
Now the Diverter valve seems to buzz when there is DHW demand and the hot water cycles with boiler lighting and shutting down as it did before.
if the boiler is left alone for a week or so the pressure when hot stays high enough to vent water but doesn't drop enough when cold to cause the boiler to not fire up from cold in the mornings. This suggests to me water is leaking across to be filling the CH. Is that a possibility anywhere other than the secondary HE?
I don't want to replace the HE and it make no difference as money is very tight and I'd have to borrow to buy it.
Any help greatly appreciated
Adam