Vaillant ecoTEC losing pressure

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12 Oct 2010
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Help! Inherited one year old combi boiler with the house. Has always had to have the pressure topped up intermittently. We were told this was not a problem.

Over the last couple of months the pressure has had to be topped up more and more frequently until it now loses pressure in 12 hours.

There is no evidence at all of any leaks from any of the radiators and no damp patches indicating pipework leaks.

Does anyone know of any fault that may lay in the boiler that could cause this to happen before we have to rip up floors to find a leaky pipe?
 
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check the blow off pipe at the back of it and see if it is passing
and bleed the rads as well and as you do it run peice tissue on each rad nut and see if it is leaking
 
Check the pressure relief valve is not passing u should c a copper pipe going outside from under boiler.. This is the first place to look . Take pressure up to 1.5 bar fire the heating an check it then also c if the pressure gauge rises into red zone after heatin has reached temperature then come back to us..
 
Have bled and checked the radiators extensively. Found one minor leak on the top one and replaced o rings. Now not leaking at all but pressure still dropping rapidly.

Sorry - a bit of a numpty - how do I check the blow off pipe at the back?

We have found that the condensate pipe seems to be leaking but have assumed that water is meant to be going down that one! Could there be any link with the pressure?
 
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OK - we had advice to tie a bag around the relief pipe where it goes out of the wall. No water in there.

Have had the system running over 1.5 bar and it doesn't go up in to the red.
 
All u can do now is turn heating off pressure to 2bar then get an Allen key an turn off flow an return isolators under boiler then just use hot water as normal for a day .. If pressure holds then leak is on system if it drops an ur sure it's not leakin outside it's probably coil gone on main ht exchanger
 

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