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Vaillant, Glowworm, Viessmann. More important than the boiler, is the installer and how it is installed

High pressure area? Had this once with a combination cylinder. At off peak demand pressure got to over 12 bar and caused ball valve leak, thus overflowing.

Would of had 3 port originally, then megaflo added with its own 2 port. If it didnt have 2 port then 3 port springs back to hot water, not safe.

As an installer I would say go with your installer of the boiler. Yes it is more expensive, but he may have more knowledge of those boilers than the guy at £35 IMHO Plus as your service is overdue the warranty may be invalid anyway. :cry:

Are you sure it is not in frost setting mode?

This is best left to a registered gas installer, as those faults are concurrent with ignition faults.

the 400 series Vaillant, is an open vent boiler, and has top connections. If going down the vaillant route, then I would advise to get all vaillant controls, as they work well together.

Did you make sure all of the old sealing material was removed before fitting the new washer. I have never used any sealant on those syphon washers. Maybe it needs nipping up a bit. A quick tip(maybe). Before fitting the cistern back onto the pan, fill it with water while supported over the...

R2 :?:

There should be an adjustable speed toggle switch, on the side of the electrical connection box on the pump. I suspect that the pump is set on a speed too high.Try adjusting to see if it quitens down. Graham

Souds like it could be an astracast sink, which is basically made of a very hard resin. The first one I ever did, I burned out two hole saws cutting into it. You will need a grit edged holesaw, if it is that tough. Graham

I have a durgo on mine at home terminating in the upstairs bathroom. Building inspector said it was fine. Have also done a few others like this. But the majority are additions ie new ensuite etc, so like you say Tony there is another open pipe somwhere else

As long as the top of the pipe is open to the air, or an air admittance valve (durgo valve) is fitted then yes you can.

Nothing to worry about. The timer on the boiler governs your heating requirements. So for example timer goes off at 8am, even if the stat is showing the flame symbol, the boiler will not light. All this means is that the stat has not reached the desiganted setpoint temperature, before the...

As already said, most likely the plate hex, and it can be cleaned. Removing it is a bit of a juggling act though, if you have never done one. If you do plan to do it yourself, then watch the pcb, when you take out hex, plenty of towels /kitchen roll needed, as these pcbs only need to sense...

Unscrew the head of the trv and see if the pin is moving in and out freely.

Sprint V2 for me

If it was me, and I was getting the main replaced, I would be looking at an unvented hot water cylinder. If you get 30lpm coming into the house, you will get very good shower performance. Even a high output combi will only give you about 18lpm. assuming you have the space to accomadate an...

In my opinion, I would get a second opinion That does a tad on the high side. You seem to have answered your own question. When you say worcester specialist, do you mean worcester themselves? Yes they charge £230 for a fixed price repair, but I am not sure that secondary heat exchangers...

When heating is on, does the pressure in the boiler rise quickly? The prv is supposed to lift at 3 bar. I would expect it to be the expansion vessel has either lost its charge, or the innards have perished. There is a topic in the faqs at the top of the front page, of this forum