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Mine is two wires, with resistance at 100 ohms which according to worcester info is spot on. I have one on order, for the cost it's worth replacing, if it's not the problem I've got a spare. Control is over £120 though so ruling everything out first before buying that.

An update: The last two mornings the boiler has been switching on with demand, except for this morning. But every evening it has refused to start on demand. Every time it has refused to start on demand the burner reset light has been on except for this morning when the light was off. Every time...

I actually think the boiler stat is working because it fires up if I turn it up to a higher setting providing it is not locked out. For the last few hours, I've been running the rads by pressing the hour boost button on the timer with the programmed settings switched off. I've left fifteen...

Yes, I was reading about a similar problem someone had on another post with solenoid. I'm going to order one and a boiler stat and see from there, plus flush the system and add a new inhibitor. I think it is related to an overheating problem somewhere.

When i left the boiler last night the boiler demand light was lit and the burner reset light was lit. No pressing the burner reset it would not fire up. This morning the demand light was lit but the burner reset light was not lit. But the boiler was not running, I pressed the burner reset and...

Heres a few photos

I pretty sure the button works OK, but will check thanks. It's funny that this time the reset lockout button has illuminanted. I think I might be chasing two problems? I'm going to shut it down overnight and see what happens in the morning. Thanks for all help so far, we shall see what...

Just an update, the boiler turned on with demand from the system. Ran for about an hour and now the lock-out light has illuminated, this time. I've tried three times to reset by pressing the reset on the burner and it won't fire up. I'll give it an hour or so and then try again.

Baffles where cleaned when serviced in Aug and the guy did check them, still clean.

Yes, I did mean illuminated. the boiler reset is a different button. I'm referring to button 26 on the burner control box. I doesn't light up but when pressed the burner will fire and the boiler runs. I'll have to check the boiler stat tomorrow in the light. That isn't the same book as for my...

I'm starting to think likewise. Thanks.

When the boiler not working the pump is still working I can hear the water pumping around the system. There are two valves one for rads and one for hot water. I'm going to clear out the airing cupboard tomorrow and check it out though, thanks.

If it is being caused by a faulty thermostat on the boiler when the problem occurs if I link out each thermostat in turn and get no response does this mean the stat is not the problem? In my thinking, if I link out each stat and the boiler fires up then the problem is that stat, correct or not?

The pump pumping water around the rads seems to work fine. I can feel it working all rads get hot when it is actually working. I thought it could be an airlock from the rad being off but I've bled every rad and boiler several times and never found no air.

If it was an overheating problem would not the boiler overheat reset button (38) need to be reset? I've never had to touch this button. The only button I've had to press is the lockout reset button (26) when it has failed to fire up on demand from timer and it hasn't been lit up.

I've just looked at the bottom of the high-limit thermostat and it is just a solid plastic lump threaded with the retaining nut on. No cap or button. Can this not be reset?

The burner is riello the burner head is LD2XSH 12/18. What do you need a photo of ?

it is just like that, so i guess the air intake is via the case. All the hoses look in good condition, clean and not blocked.

The air intake is via an external flue in the boiler side casing, I've checked it for blockages. The guy that came out did meter the flow and CO2, not sure exactly what he did there. there are two reset buttons under two thermostats, one for flu manual reset and the other for boiler manual...

Thanks for that info Oldbuffer, All pipework is copper in my house, I made sure of that. The system was all new in 2008 so it might be time for a flush-out. I was thinking along the lines of there being nothing wrong with the boiler as it works fine when cool, apart from the intermittent...