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baxi combi instant 105 HE?

the boiler doesn't light on DHW unless I put both kitchen and bathroom taps on at the same time. Would it be a fault with presure differential valve? or something else?
Tony, April 2008
might need a diaphragm service kit or possible blocked impulse tube

iain, April 2008
link Click here to see other fixes for Baxi 105 HE.