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Feel the flow and return pipes a couple of feet away from the boiler if you can. Are the pipes hot? If not, check he hasn't done something dumb like leave the flow and return isolation valves closed off after the repair. These can be found directly under the boiler.

Often takes ages to get through but I've always found the helpdesk team very helpful and knowledgable.

You say the pump is new. How long ago was it changed? Has the system been re-pressurised correctly since? What is the reading on the pressure gauge? Have you bled the radiators? :?:

Post us a photo of the boiler in the shed when its finished. Might be able to win myself a new cordless drill or pair of work pants from the 'I spy' page in Gas Installer Mag! :shock:

The fact that the pressure doesn't drop when the heating isn't on (which is what I think you mean) suggests that it is not a leak. I would think that if the system depressurises every 24hrs and the leak was in the combustion chamber there would be water dripping out by now assuming this has...

Air in the system still . Or failed or failing pump

Cant say without seeing it. Ring Worcester and request a service call. They will do the necessary diagnosis and replace upto three major parts for around £180 inc VAT.

Does the basin waste go straight into the soil pipe? Could be coming from the basin plug 'ole if thats the case. I,ve found smells this way sometimes if the bottle trap is partially blocked, especially with stuff like cotton buds. It can sometimes stop a proper water seal being formed and allow...

The whiring noise could be a bit of air in the pump. It should work its way out. Try bleeding the upstairs radiators in an hour or so and top up the water pressure again if necessary.

Probably has caused it. Sometimes when they dry out they come back to life. But if its been a while then chances are you need a new one. I,ve been to leaks on boilers which have wet the circuit boards etc. I've used a hairdryer to dry them off and they come back to life. And NO I don't carry...

You should have an external filling loop. This is usually a silver braided link about a foot long linking the cold water mains to the central heating flow or return pipes. It is usually located directly under the boiler but sometimes you have to root around under worktops, in cupboards etc. Just...

No (excessive) vibration is normal. Has the boiler been serviced in the 4 years since installed? A good service engineer should spot where any excess vibration is coming from and either fix it there and then if its straight forward - or advise how much to eliminate the noise if it needs parts. :)

Sorry, your post is not clear. However, if I've read correctly and anything has gone 'pop', turn off your boiler immediately and get a CORGI to check it out. Especially if you think it has something to do with the gas valve. :shock:

I assume you still have the old radiators. It is sometimes necessary to bleed the system a few days/week after a new installation. This is quite normal and settles down. However, if you have to do this more than a couple of times you probably have a small leak somewhere on the system which you...

Could you pull out your installation/service guide & tell me what code F.12 reads. Don't seem to be able to download one from Vaillant website at the moment. What are symptoms?. Does anything happen before the error code appears? From memory I think F.12 relates to a fan/aps fault but the manual...

Did you pull it out or undo with a radiator key? If the former, you've probably stripped the thread and need a new radiator. If the latter put the pin in the radiator key, put in the hole and turn clockwise until tight. If you have water squirting out, close the valves on both ends of the rad to...

I agree with Gasguru. Jointing compound or PTFE is essential for a reliable joint. Cant remember how many leaks I've been to on compression joints and found that the original installer has not done so(water and gas).

Oh,... and don't forget to invite the taxman :wink:

In my area we get about £80 average for strip out, incl about £18 - £25 for a cylinder. Set up an account with a scrappy and save up the cash value. We save it up over the year and use it as our company Christmas fund and have a mega blow-out. Just hope the scrappy doesnt take yer cash in...

Its possibly leaking from the gland, although this is more usual when open. You could try tightening the nut at the base of the spindle with a spanner (turn clockwise) - quarter to half turn should do it. If that doesn't sort it you may need a new stopcock. To change this you will need to find...