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What is wrong with my central heating?

Hi
My central heating and hot water will not turn on when requested. The electronic time is set to 24 hrs and the thermostat is turned up to 35 degrees plus but nothing. The boiler on light is lit but nothing. All other lights stay off and I do not get any hot water and central heating. The engineer has visited and changed the electronic board and the solanoid but its still not working.
The boiler does eventually light after maybe 1 to 1 and a half hours but he central heating will only work if the hot water is switched on.
Can anyone help? Engineer due again tomorrow!!
Cheryl Schofield, May 2012
i refuse to help unless i know
make & model of boiler
fault codes/lights flashing?

muppet, May 2012
boiler make & model?
gas council number?

manwithnoname, May 2012
Thanks for replying. Not a new installation, 2005. It seems to be giving up completely now and won't come on at all even though there is power to the boiler.

Cheryl Schofield, May 2012
if this is a new installation i would say that the wiring is crossed from c/heating to hot water and vice versa

toptrish, May 2012