We had the same problem, heating works fine,but the hot water light flickers or doesn't illuminate at all and no hot water when tap is turned on.Problem was the microswitch part no.126262 costs £8.78 + vat from Plumbase and on the website www.mjtcontrols.co.uk £7.38 + vat delivered in couple of days.Easy to change located on the right hand side of the boiler behind th pump.
Carol Cousins, November 2005
