The spark generator for these is on the control board, which can be removed without dismantling the boiler. One of the control boards has part number 407676, other Netaheat boilers have similar looking control boards.
The spark generator has a transformer on its output side, which generates the high voltage needed to jump the gap from the ingition electrode. This transformer can fail, so although the unit 'clicks' as the circuit switches to generate the input to the transformer, there is no output and therefore no spark.
You may also wish to check the condition of the cable leading to the ignition electrode, the insulation on this can harden and crack in the 4 to 5cm inside the boiler casing, allowing the spark to either weaken or arc across below the pilot jet. You may find the boiler in this case takes a long time to ignite/re-ignite, basically the casing needs to fill with gas before this displaced spark will ignite the pilot flame, instead of lighting immediately that the first spark is generated. This will require the casing to be removed and tou may wish to leave this task to your heating engineer for safety reasons.
It may simply be worth installing an exchange control board. I highly recommend CET in Watford for one of these:-
http://www.cetltd.com
The 407676 should cost around £50 from them, including courier delivery. You will pay £120 to £200 for a new one.
Paul February 2012 |
Thank You for your response hi-tech plumbing.
Do you know a decent fitter in Essex you could recommend? Everyone keeps telling me no spares are available, through these pages I have found spares online for the 10-16 netaheat boiler.
Mine is the really early one with a relay (I had previously changed this and it made no difference) the manual is dated 1974 - I need to keep it going for a while until I can afford to change it.
Any guidance would be appreciated.
Thanks
Adrian Fulford August 2007 |
putting both them faults together and knowing the boiler quite well the like the ignition part of the pcb faulty.
for one i would get the fitter back who fuc*ed it up.
hi-spec plumbing August 2007 |