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Get them back out to check the heat exchanger. If when they take the combustion chamber cover off there is any staining on the side insulation panels or the heat exchanger has green staining(normally at the sides of it),it needs changed. Don't be afraid to ask them to show you the inside off the...

Its either the fill loop passing or the heat exchanger passing. Disconnect fill loop first if its still doing it then must be heat exchanger.

REPEAT ADVICE!!, you may have had your boiler serviced but if you have opened up the conmbustion chamber to replace the fan, it needs to be checked again by a gas safe engineer. FFS why do people think its alright to mess about with gas appliances. Get it checked. No one on this forum is going...

I dont think anyone will give you advice if your on about dismanteling flues etc, you say sensor fault, but the only sensors on that boiler you've already changed. You should just bite the bullet and call out someone qualified.

Thats really quite a small leak. You could go down the road off trying some leak sealer in the system. Normally a last resort,but if you've check all rads etc i'd give it a go.

What was wrong?, out off curiousity.

Better draing the system m8. :D :D :D :D

X 2 expansion vessel

If you open up the combustion chamber then you could be effecting the combustion off the boiler.

Thats me told!, its idiots like you that cause accidents. :D :D :D :D

Are you gase safe registered?

Mclearg areyou gas safe registered?, if you're not then don't open up the combustion chamber. If you've changed the thermistors, then i would get on to a gas safe registered engineer.

Flipsix it sounds to me like the synchron motor inside the mid position valve is loose, turn the power off to your central heating at the main isolator and remove the silv cover there will be a motor in there with one or two screws securing it. Check if they are tight. If they're loose when you...

Coals broken,flames coming into room,soot.... No brainer for me this fire would be chopped and nomway i'd be attempting to fix it. If you do want a gas fire as previously advised get a fan flued fire.

How much pressure is the system loosing and over what time?

Agree with plumbplumb, sounds like the calorifier restricted. You might be able to add some cleanser to it. But most likely it will need changed.

Check your main water storage tank in the loft. Not the first time i've found dead brds etc in the tank.

Aluminium heat module?, i take it you mean the heat exchanger?, not likely if you're getting heat with the stat turned up. Did the engineer check the resistance readings on the sensors?. It definately sounds like a sensor/potentiometer fault to me.

If all your radiators and radiator valves are dry and there is no leaks around your boiler and you're sure there's no water coming out off the pressure relief pipe, then get a gas safe engineer to check the main heat exchanger on your boiler, vokera boilers off the type you have are famous for...

Did you say that you still get heating if stat tured right up?, if so not your pump thats faulty. Sounds like a sensor probem to me. Best to get a qualified engineer out to check it.