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Mend SIME format.zip Combi Boiler Fault Lockout

SIME format.zip boilers?

I need to know why these combi boilers fault out when there is a call for heat. Everything runs fine when the DHW is running but when there is a call for heat and the modulating gas valve goes to drop down into single stage it won't run. The boiler tries to refire and will not so it locks out entirely. Any suggestions?

Mike
March 2010
SIMESIME format.zipHeating, Home Heating SystemsCombi Boiler Fault Lockout

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