my sime 80 boiler fires up ok but only stays lit for about 5 seconds then it shuts down and keeps on doing this over and over agan for the heating and hot water
It's possibly the air valve that needs maintenance, or it could be the pcb. Eitherway, you will need a corgi qualified person to check it for you and could be a pricey job.
John T
December 2006
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