leaking boiler saunier duval sd 623 14 years old?

old saunier boilers all leak from many places mainly the divertor near the pressure gauge.
it is caused byexpansion tank losing back pressure & damaging the divertor.
change divertor & when boiler is empty pump air into expansion vessel (red tank on the back) with foot pump as it is a tyre type valve. put it up to 1.3ish bar.then boiler will work & not cause leaks randomley due to expansion pressure pushing on joints or 3 bar valve but int expansion vesell as designed.

daniel servante
December 2008

suanier duval central heating not working and the plumber had a look and suggested that it is the circuit board and pump and quoted £450 to fix.

any idea for spare parts

kholeefa
May 2008

If it's the same as the thelia 623 mine was the hose fittings, just nip up the jubilee clamps , then the water pump housing eventuall give, so that was a new water pump.

craig
February 2008

I hope you are not having the same fault as in November. The three most likely leaks are, front section, double valve, pump purger. If the pressure is not going down maybe the diaphragm arch.

bendan
February 2008

The information is too vague to give an ansaer. Be more explicite as to where the drip is seen

bendan
November 2007