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Topped up boiler 3 times in 3 days!

(6 Posts)
HexBramble Tue 03-Jun-14 21:34:58

My valiant combi boiler has been losing pressure v quickly and I've just topped it up for the third time since Sunday. After a quick google, a potential leak was mentioned so I've felt under every radiator in the house and they are all bone dry.

Any advice please? My plumber charges £50 just for a call out shock

playftseforme Tue 03-Jun-14 21:40:44

Could be a leak in a pipe, not the radiators. Could also be connected with the 'exhaust' pipe. We had both those issues on separate occasions - just lucky I guess. Not sure that this is a DIY job.

Lagoonablue Tue 03-Jun-14 23:01:03

Could be a leak in pipe work under floorboards. Or something else completely.

Sorry but you need a plumber.

dotnet Wed 04-Jun-14 09:42:47

My guess is that it's what's called the pressure relief valve or pressure relief switch. That's something internal; my own Vaillant boiler did the same thing last year. Then, this past winter my brother's boiler (not a Vaillant)had the same problem - pressure relief valve again.

I don't think it's a massively expensive thing to sort out - getting the valve replaced is a quick job. Mine was done through insurance though, so I'm not sure how much it will cost.

Vaillant have a good helpline where you can talk to a 'technical adviser', I think they call themselves. They might be able to give you a rough idea.

PigletJohn Wed 04-Jun-14 09:45:04

Go outside the house and look at the wall behind the boiler. Does a small pipe come through the wall? Is it dripping?

Do radiatior pipes run under the floor?

starfish4 Wed 04-Jun-14 14:30:16

We had to keep topping ours up and had an air leak in the expansion vessel. This produced the dripping referred too by PigletJohn. We first noticed we had a problem as the pressure gauge was no longer at it's usual 1.5bar when the heating was running, it was rising to 3bar and emptying the water outside. If it's a leak on a pipe I don't think it would do this.

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