Saunier Duval Themaclassic F35E combi leaking (fast!)

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Had one of the above fitted 5 years ago or so.

Last year it started to show signs of loss of pressure in the expansion vessel, so had it pressurize back to normal.

Over the last few days the boiler started to leak very badly - water coming from somewhere on the right hand side if you stand facing it. Up to 1.5l in some cases in a day. Only happens when boiler is running (heating), and seem to be worse when cold outside.

Am I right to assume that the source of the leak is the expansion vessel?
 
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Thats not a bad leak!

Wait until you have seen 15 litres per minute!

Sonya Duvals have a reputation for leaking.

Most unlikely to be the EXV.

Whats the system pressure? Does it need refilling every day or two?

Tony
 
Thanks a lot for taking the time to reply!

Yep - pressure dropping (this morning to 0.6, usually to around 0.7-0.8).

Also fluctuate between hot and cold (2.5 when hot after a run, then drops to around 1.0 when cold), which made me think that it could be the expansion vessel.

I assume EXV - Expansion Vessel?

Any more thoughts?
 
I expect the EXV needs repressurising with air. See the FAQ.

The leak will be coming from a loose joint or unterminated PRV vent! Better to get that corrected.

Tony
 
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Thanks again.

I'll have a closer look tomorrow to see if I can spot the source of the leak.
 
These boilers are held together with clips and o rings the silicone grease dries out, you fix one leak then there's another and so on and so on and so on !!!
 
I thought you were going to say with a "song and a prayer"
 

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