Anyone got ideas re a fault with my combi. It is a Vokera linea 28 which is about 6 yrs old. When I turn on the hot water tap the boiler fires up and works for about 20 sec's it then turns off. The central heating works fine, turn it on and the boiler fires up and works no problems, however, as soon as I then turn on a hot tap it goes off again. I am assuming, after going through the fault finding chart in the manual it could be either the PCB or gas control valve, anyone got ideas on which it could be.
no hot water vokera linea combi
- Thread starter blootvr
- Start date
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Is it the season for clogged heat exchangers or something?
It could be a temperature sensor though as well - get your multimeter and check the resistances.
It could be a temperature sensor though as well - get your multimeter and check the resistances.
Run hot tap & observe temp on display (it reads dhw temp) as soon as blr shuts down then immediately turn isolating/filling valve from 12:00 position to 06:00 position which stops water flowing. If temp display goes up to about 82 degrees then your plate heat ex is blocked probably with magnetite
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Hi, again and thanks for the replies, I have tried the suggestions and it does not appear to be any of the listed faults. I have however, been checking a few of the controls, when I turn the DHW temp control down below the 3/4 mark the boiler will not fire up at all when a tap is turned on, once moved to max it fires up for 5-10 secs the flame then dies down and goes out. If I leave the tap running turn the DHW temp control down to min for a few secs then back up to max the boiler lights again but goes out as before. Does this point to a faulty temp control. If so looking at it, it is part of a smaller PCB under the main PCB.
might be a dodgy thermister - you'll need to do multimeter readings.
Hi again, thanks for all the advice, got a new thermister for the DHW heat exchanger, it now fully working again 
. Wher do I send the £1,000 for the advice re the PCB
. Wher do I send the £1,000 for the advice re the PCBDIYnot Local
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