The pilot light is lit but the central heating won't work, it is just making a clicking sound.

I think it is a 50FF

Charlie C, October 2010

My 18 month old Saunier Duval boiler is heating the water ,but is making a loup noise .What could be the problem.?
Thank you in advance .

B. leslie, August 2016

when boiler is on position pilot light will notfire up

f e charleswrth, November 2014

yes sorry the pump has to work for the boiler to fire up

Richie, October 2010

no it runs from the power supply(240v) when you turn on you timer/clock, If the impela is seized then the boiler will not fire up properly because it relys on the pump to remove the heat away from the boiler

Richie, October 2010

Does the boiiler not have to be fired up for the pump to work? or does the pump have to work for the boiler to fire up?

Charlie C, October 2010

I have the same fault with mine, but before when it has occured it was the water circulation pump that sits in the pipe work near the water tank, turn your heating on and you should hear it/feel it turning (buzzing sound), or there will be a big screw in the front, un do that (will loose a very small amount of water) and you will see if the impela is turning, or take that screw out when the heating is off and see if you can turn the impela with a flat haed screw driver.

Richie, October 2010