Hi all,
I have the above model & have a slight problem, boiler is slow to ignite when heating is called for, I have timed it from when I turn on the thermostat on the wall, the boiler picks up the signal from the thermostat fine.

The pump kicks in & you can hear the fan kick in & working, then about 20 seconds later you hear a sensor or something make a noise & the boiler fires up, this takes about half a min, it used to take about 5 seconds.

When I turn of the hot water taps the boiler fires up in about 3 seconds.

Anyone got any ideas?

Any help would be appreciated.

Nigel., September 2009

Yep it is def the diverter valve, Cheers Dave.

I will get some new replacement parts for it.

Nigel., September 2009

30 seconds??!!!!! 30! if this gets to 42 seconds i think you should consider moving house. or get a hobby that doesnt consist of monitoring your boiler so closely. if it takes ages for the hw to kick in then try again.

gilo, September 2009

it sound like your d/value is slow to return back, if your water is very quick to fire then it can not be the air switch hope this helps David

capitalboilers.co.uk, September 2009