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Yep... its leaking... check the usual suspects (PRV pipe, Auto Air Vent, Rad Valves) best thing to find a leak is your eyes and a bit of toilet paper... It'll be the bit thats wet ;) fixing the leak depends on where it is :D

what is the model number of the existing timeclock?

or no bypass... boiler kettling as all the trv's turn off?

Tha auto air bleed is a fairly small cylindrical bottle almost always in either brass or black plastic. usually on the top is a car tyre valvelooking opening, which lets air out of the system, unless its faulty in which case it also lets water out. I can't remember the boiler layout but its...

Quick runthrough of what happens to the pressure of a heating system. (Pressures used are just examples and will vary) No Problems:Cold (1 Bar) Turn the Boiler on, Depending on pump location pressure may drop or rise slightly (1.2 Bar) Boiler Fires, hot water expands increasing the...

It ain't your pressure vessel. If it were the pressure would go up far greater then 0.2.. and the PRV would leak. What you have there is technically known as a leak somewhere.

Heya lads, Know of a good online repository of Boiler Manuals/Service Guides? Cheers. Dark.

Soaking through the tiles??

PCB? possible but you have had the fault with 2 seperate PCB's before, so No. Fan? No. It either spins or it doesn't, it doesn't have any decision over the matter. The Air Pressure Switch Does that bit. It can spin too slowly when the bearings start to go but its normally as noisy as hell...

Parts Centre now innit ;) Phone them before popping in to make sure they have the part, or they can order it in for you.

As Paul said.. its a fairly frequent occurence. I went to a house the other week who wanted a flush because of blocked radiators, 4 stuck TRV's. Told them it was sticking valves, they still wanted the flush (and to be honest, I found it wasn't the cleanest of systems whilst doing the...

Then you may have trouble overcladding/replacing it.

*perpetually

yep... just remember to open the hot tap up fully first. Edit: actually the cold taps in the bathroom may be fed from your tank rather then the mains... in which case, No.

Airlock: I find taking the spout of the kitchen tap... replacing the little screw, putting my hand over the hole and turning the hot and cold taps on (in that order) and off (cold then hot) is enough to get it shifted, easier then the bit of hose imo, and less likely to spray water everywhere...

Most likely to be the clock. test it with a multimeter if you wish to be sure. It's a nice easy swap out on the optima too. 6 screws - 4 wires if I remember correctly :)

if you can run the cable fairly easily I'd go wired myself, no batterys to worry about changing. (says the man with a wireless system) It stands a fair chance of being 240V though, just so you know.

feel free... it is switching device... it doesn't work on resistances.

not gravity fed

I have brought somthing recently that was ~£5, and the sales droid offered me platinum super gold 3 year insurance at ~£7, My responce was "Are you taking the ****?" I think it was somthing for my computer.... or car.