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When was it last serviced? Could be spark gap too small, duff spk gen, poor inlet working pressure at ignition. Ideal have a new improved ignition board now(pcb 41) which sparks then opens gas valve. Instead of sparking and opening gas valve at the same time.

£100 including expansion vessel

To replace the expansion vessel on the Response 120 you need to have either clearance at the right hand side or top of boiler to remove it, otherwise it is a boiler off the wall job. Fairly easy to replace £100 is a fair price to pay, shouldn't take longer than an hour. Bear in mind that Bgas...

The Ideal Minimiser can suffer from lockout in the mornings, usually caused by damp probes. Get your engineer to try the following; Adjust spark gap to 5mm ensure detection probe is aligned with burner ports. Increase burner pressure by 1mb Remove the pcb 37 and fit a pcb 41 Ideal...

Nelson, sounds like it needs a service. Pilot burner probably blocked and burner pressure may need checking. A full service should see it right again.

As I said before, good luck. By the way A plumber is not a heating engineer, and a heating engineer is not a plumber!

Getting a little upset? So you are too tight to pay out money for the regs? you want them for free? I have the current gas safety regs and British standards to hand and refer to them almost on a daily basis. As I am also corgi reg'd I have a back up technical line and relevant info needed. I...

So you have really answered your own question, have you not? You can't find the regs that you need, but you are competent in fitting a boiler? Part of the acs assessments that all corgi Engineers and Plumbers have to pass at great expense is to demonstrate an ability to find the regs...

Isn't that the point of getting a qualified Corgi guy to install the boiler? Have you already arranged for someone to commission?, I think you may struggle there, I can't think of any Corgi guys that would go in and put their name to an installation that was not at least over seen by them.

We normally fit the Ideal Classic boiler in conjunction with the Gledhill. It is a proven reliable boiler. Cost depends on system etc

I'm guessing that you either have an elan or a Classic, more details would help but if it was the gas valve you should expect to pay approx. 140 pounds for the valve plus what ever labour charge the engineer quotes. It would be a fairly easy diagnosis by any heating engineer what the fault is...

Yep agree fully, most probably the motorised valve is letting by, if that is the case the whole valve will need to be replaced. Price depends on size of valve and how much the heating engineer charges per hour. Ball park figure approx. 150 pounds

It depends what boiler you have, give me some more info and I will try and help you.

What boiler is it? Ideal make lots of different boilers. From the sound of things I would say gas valve not opening for main burner.

That is your calorifier, it should look like a round grey unit with several pipes coming out of it. If you plan to remove it I wish you well, they were a good boiler at the time but tend to leak more often than not when disturbed.( Even in places you haven't touched) DON'T TURN THE BOILER...

Ian the 3 things on the boiler that could cause this cycling on/off problem are: thermister ( black lead from pcb to top left of heat exchanger) Potentiometer ( from the back of the black knob on the front to the pcb) Pcb- ( board 25c) The only sure way to tell is to check the...

Precisiely my point. You removed the outer casing!!. That can be potentially lethal if the seal is not sound or is not correct.

How old is the boiler? Has it been serviced recently? May be flow switch or thermister related

What is the flowrate at the taps? You should be looking for about 11 litres per minute at a 35 degree rise.

Kash, if you ever listen to one piece of advice then please let it be this, If you have removed the front case of the boiler and poked around inside PLEASE CALL OUT A REGISTERED CORGI ENGINEER to look at the boiler. If you do a search on the Potterton Netaheat you will see why. Not meaning...