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Vokera Combi boiler fault

We have a 4 year old Vokera Combi boiler. The system overflow runs most of the time (steady but slow). The boiler pressure does not drop, and in fact the system pressure slowly rises over a day or two. I have disconnected the filling loop. So we can discount the filling valve. Anyone got an idea of how the system is loosing water and the pressure is going up?

marhan31 (Sun 19:06 14/Nov/04)

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Answers 1 to 7 of 7

RAYMAN		(Mon 12:32 15/Nov/04) go to keyword or quick start. type in vokera combi boiler faultfinder look for question&anwers hope it helps.
speedyme		(Mon 22:08 15/Nov/04) check expansion vessel pre-charge pressure.this must be done with boiler water pressure at zero.
boilerman 2		(Sat 17:59 20/Nov/04) Possable fault with expansion tanks unless you know how to test them advise that you call in your local corgi engineer.
tecman		(Tue 18:32 23/Nov/04) sounds to me like you have two problems now depending on the model of the boiler domestic heat exchanger needs replacing as this is the only way to pass water to the heating side of the boiler probably now the auto pressure relief valove will need replacing find a corgi registered gas fitter better safe than bodged
kipperochkid		(Wed 17:11 24/Nov/04) Check the pressure compensation tank in the boiler. The large, red, circular thing behind the furnace, It has a valve on it like a tyre valve. It works like the bellows in an aneroid barometer, only twenty times bigger. If it is full of water it will cause problems. It's there to take the expansion on heating and return it on cooling.
cee		(Thu 18:55 02/Dec/04) if you are getting water running all the time, it can only be comming from the domestic h/w side of the system, as you say that you have turned off the loop.try turning off the cold water inlet and if it stop running you have the source of the problem, to cure it , does the boiler have a hydraulic diverter valve, if so check the diaphragm
marhan31		(Thu 19:39 02/Dec/04) Question Author Thanks to all who posted a suggestion. I have fixed the problem now. It was a very small internal leak on the domestic hot water heat exchanger unit. I bought one myself for �65.00+VAT and fitted it last week. It took less than a hour to finish the job. All is working fine now.

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