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Hi DIA, The boiler keeps going, I have to shut it off by pressing the CH or HW (or both depending whats on) buttons on the programmer. Oddly if I then press the CH and/or HW programmer buttons immediately after pressing them to turn the boiler off, the boiler does not fire up. I'd have...

Thanks Tony, Picking up from your earlier post I will check which HW pipe is the hottest but how would I know which is the flow to the cylinder and which is the return? (I just presumed the return would be colder which is the one with the pipe stat on in the garage) With reference...

You're right but at least War and Peace has a reasonably happy ending :)

Thanks DIA, No there is no stat on the cylinder return other than the one in the garage which is linked into the frost stat. Yes the boiler is controlled by it's own stat. At present it is turned to 6 O'Clock and it still boils up. There is still a lot of noise (whooshing water/steam...

System as follows: Potterton MF RS70 Floor Mounted Mains Gas Balanced Flue Boiler in garage Pumped CH with Grunfos three speed pump in garage, open vented with header tank (approx 12 - 15 ltrs) in loft 12 radiators with TRV's to most radiators Old fashioned analogue room thermostat...

Hi DIA, Didn't trust myself with a hosepipe across the carpet so cracked open the CH drain-off outside the conservatory 1/2 a turn and then nipped into the loft and the header tank was filling fine. I didn't have any particular concerns as last weekend we drained down, refilled, added...

] helpful.....****

Presumaby another cold feed is the one from the header tank in the loft to the boiler? How would we check if this is blocked? Thanks,

Hi Terence, Yes cold feed to expansion tank is fine and runs well when ball valve is pushed down and cuts off fine. Is there another cold feed we should check? Thanks Steve

Hi Tony, Just a quick update on our boiling problem. I drained down the system, refilled and put in Fernox F3 into the header/expansion tank, ran for a week and this morning drained down, refilled, drained down again, refilled and added Fernox F1. For the week the F3 was in the banging has...

Thanks DP BIL's been away so have not asked him before, just happened that he was round yesterday when it happened. Thanks for coming back and explaining where to check with a magnet. Steve

Hi all, been fine for a couple of days until this evening when the system went bonkers again, banging, boiling, overflowing. As it happened my BIL was round and he seemed to have a grasp of the system. Is going to check the tanks in the loft at the weekend for correct filling, going to drain the...

Hi Picasso, How and where would I check the cold feed? And cold feed to what? Thanks, Steve

Hi DIA, nothings changed, HW & CH on at 7.00am for an hour then off until 5.00pm then on for an hour then off. If during the day it gets a bit cold in the house we hit the CH advance button on the programmer which fires the boiler and also heats the hot water. Now, sometimes it will be...

Thanks Tony, Postcode is RG14 Newbury, about 2 mins from Junct 13 of M4 (Didn't boil up this morning!) Steve

LO GW, I changed the OH stat as Potterton tech told me to try it when I rang them back in September. It is on a bracket but I just presumed this was just a heat sink or something. I don't understand heating systems and thought a forum would be a good place to get a bit of feedback/advice on...

LO doitall, I don't know what fishing and playing means but this post has been 'revived' from September 2012 as the symptoms sre still there. Have a gander at first post for the boiler spec etc. No mods at all to the system, basically we've been here for nearly 7 years and had nothing done at...

Hi Tony, Installed the thermistor this morning, replaced the cover, fired up the boiler and within 20 minutes it was boiling again and water coming out of the (vent?) pipe into the expansion tank in the loft, creating steam and overflowing through the fascia overflow pipe. As the weather...

Thanks Slapper, it's been getting progressively worse over the last couple of years and now it's nearly every day so I guess a slow build up over time does seem a possibility. Just don't want to blow £300.00 on a flush if it's not going to work. as Tony mentioned in earlier post we really...

Hi gaswizzrd, I think Tony is just being realistic, there's two screws holding the front panel on and the thermistor unclips. I'm simply just going to do it myself, although I have a feeling it's not going to help the situation. The gas and mcb will be off when I do it. We all do things...