Vaillant echTEC Plus 838H over pressurising | Boilers | Plumbers Forums

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Discuss Vaillant echTEC Plus 838H over pressurising in the Boilers area at Plumbers Forums

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Hello.

Not to long ago I took off a radiator to paint behind, since I put it on for about 2 weeks the pressure kept dropping to zero, I topped it up when I noticed it had happened, then 1 day it over pressurised and went to max, I then released some water out of the radiator, this happened a few times until I got it serviced and the prv replaced, and the expansion vessel replaced, it is still doing it but not going to max, it goes just below max but above the min/max threshold line, over timeframe of 48hrs.
I am reading the digital display on the front.
When the heating comes on it doesn’t spike and then stay high, it’s a gradual thing.
It also drips from the 15mm pipe outside.
The boiler is 10 years old.
I am going to get the plumber back round but I like to understand these things myself, anyone have any clues ?

Someone suggested it maybe the filling loop faulty valve, I’m not so sure because it doesn’t go to max.
 
Last edited:
If constantly filling through the loop it would rise to 3 bar (assuming you have 3 bar on the main) whether heat on or not, then discharge through prv causing pipe to drip. Loop should be left disconnected and capped to prevent this.
Deflated or ruptured expansion vessel usually causes wide fluctuation of gauge while system heating, ie. veering between high and low.
Your plumber will probably be able to get a more accurate picture if there is a manual gauge under the cover. T
 

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