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How can i fix my ferrolli 77ff combi?

having problems with a ferrolli 77ff.
Boiler will not start in hot water or heating mode, fan runs. have changed air pressure switch but will not go any further and diagnostic led will not light up to show air pressure switch is energised.

ken
March 2008

Heating, Home Heating Systems Problems Boiler Heating

have the venturis been cleaned ..... and are the hoses 2 the switch from the fan in good condition and not split ??

matt the boiler man
March 2008

poss pcb problem i have found many of these burned out check for voltages at common on pressure switch and the NC on the switch

paul
March 2008

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How can i fix my ferrolli 77ff combi?

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How can i fix my ferrolli 77ff combi?

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How can i fix my ferrolli 77ff combi?

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Worcester boiler dripping water?

Vaillant ecotec 831 plus?

Remove boiler cover?

Siemens RDJ10RF thermostat problem?

Boiler cycle?