when I turn on the hot tap on my vaillant turbo max boiler the heater is not igniting for ages. If I keep turning the tap on and off it will eventually fire up. It never used to be like this so what is the problem with it? Meanwhile I'm wasting gallons of water down the sink, not good when you are on a water metre!

fiona, March 2007

Sounds like your boiler is full lime off your cold water going in to the boiler. That slows down the move ment of your diafram and little port holes can be blocked to the diafram housing

M.G., March 2007

sounds like a flow switch

hi-spec plumbing, March 2007