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Just to clarify, one of the parts changers tried to solve the problem by changing parts but being unsuccessful replaced the original ones. I do however have a spare new gas valve. So parts replaced over 11 years are APS, APS and Modulator on gas valve. The spark electrode didn't actually need...

So, the two holes in the pilot nipple were simply needing a good clean. This was checked, held to the light, two holes clearly visable. But looks like a more thorough clean was required. Looking back over the life of this boiler, I must say, I haven't been too disappointed by this ravenheat...

Let me put everones mind at rest. It cost me £40 to get this done by another gas safe person. I should add, however, that he did initially think the gas valve was at fault but when I told him what I had read on the forums (The pilot light not lighting would not allow the gas valve to open). He...

Having changed the spark electrode, a pilot flame appeared (with the pilot taken out of its housing and only doing a quick test, though I didn't try this with the original spark electrode). But flame was not appearing to be strong enough to ignite main burner(suction from the fan kept putting...

Both the measurements are fluctuating. Am I suppose to get a single value or is this dependant upon the APS?

ianmcd I'm using a DT-830B multimeter. Set to 200 ACV. To carry out this test, I removed the honeywell ignition pcb from the gas valve which gave me access to the enclosed plug at the back of the pcb. I connected common to the middle pin (earth) and measured against the very top pin. Then...

Ianmcd There are 5 connection points at the back of the honeywell ignition board. The middle one being earth. The top two are for the Gas valve Main and the bottom two are for the gas valve pilot both have a voltage at the point of boiler sparking.

Agile, the problem I have with the statement you have made is that__ a gas engineer does not repair parts. He identifies the problem and then replaces the part with another one. The responses, so far, to my questions appear to rule out all but the most expensive parts of the boiler, i.e the gas...

The closed plug is connected to the honeywell ignition board which has cable connections to the main control motherboard: What should be the voltage? If the voltage was incorrect then where would that point you in the direction off?

The trouble shooting flow chart mentions EV1-COM on the gas valve (pg44) but not on the pcb? Though the manual is suppose to be a guide I think it is unclear on this point.

ianmcd What would you direct a gas safe person to focus on?

How do I measure ev1 com. You asked me this at the beginning..please give details.

What is the voltage from the pcb to the gas valve suppose to be?

What is the wiring loom

Agile I spoke to a couple of gas safe persons (parts changers) and have found that in some cases I am able to get hold of a part at a better price than them. For example, the ravenheat thermister I purchased from ebay for £5. I believe this is cheaper than most places. I could be wrong but I'm...

Slugbabydotcom The pilot injector is clear and checked (by the parts changer). When held to the light the tiny holes were clearly visable. The pipe has also been checked (allows air to pass through and another one was used by the gas safe person) No problem with this.

The boiler has served me well for 11 years where the only fault has been the Air pressure switch. Once it was changed by the ravenheat engineer while the boiler was under warranty and later by me when roughly 8 years of use. I didn't think the APS would be faulty or even the Fan since a spark...

I bought the gas valve from an ebay supplier who has plenty of good history. Yes I know some of you might think its probably faulty but it did seem genuine and once delivered was in excellent (new) condition. Really, it had no signs of use. The thread for the pilot connection had no sign of wear.

I've changed an APS on two occasions for this boiler and I did pay for the gas valve but I'm completely stumped by this fault. The parts changer was recommended to me. I thought it couldn't do any harm to let him try, who knows he could also have been successful. The gas valve cost me £50 but...

Thanks Ianmcd Yes the reset button has been reset. And no rewiring has taken place. (The parts changer didn't charge me for his attempt to resolve the problem)