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modulating gas valve?

on firing up the boiler it modulates after about 6-7 seconds then cuts out flashing up f4. ive increased the inlet on the gas valve which solved the problem but was well over gased, decreased the pressure on the gas valve and the fsd would not detect any flame. am stuck can anybody help?

b. fletcher
August 2009
Heating, Home Heating SystemsSeconds Cuts Flashing
get a qualified engineer to look at it.

Ian
August 2009

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Boiler Modulating Gas Valve Issue - F4 Error