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sime 80e boiler fires up for 5 seconds then turns off?

sime 80e boiler fires up for 5 seconds then turns off for 5 seconds then back on continuous any ideas please
sime on, November 2007
it was the ignition pcb

sime on, December 2007
Thanks for reply, will this be on the ignition pcb

sime on, December 2007
check for wrong polarity

blue knight --- corgi gas engineer, November 2007
link Click here to see other fixes for Sime.