Saunier Duval Boiler Issue

[andrewstokes87]

I have recently been to a customers property and they have an issue with a suanier duval boiler which wll not fireup. There is no fault code.

On turning the boiler on the fan runs for a couple of seconds and the green light comes on and then nothing the light goes off and the fan stops.

The display just shows the temperature and nothing else.

I have checked for any blockags etc and everything seems ok!

as anyone come acoss this before or have any advice?

 

[IDCHAPPY]

Have you checked it's getting a signal to run?
Does the hot water work ok?

 

[IDCHAPPY]

External controls ok?
Has he altered the temperature setting lately?
What model is it?

 

[Dotty]

Once you've eliminated the external controls you'll need to get your post count up so this can be answered in private forum.

 

[andrewstokes87]

Thanks for the replies not sure on the model to be honest I did write it down somewhere.

The boiler is a system boiler and does not run when the controller is calling for either hot water or heating or both together.

Although the pump runs and the 3 port does move.

Its a strange one as the green light goes out with the fan but I does not go to the red fault light.

It does not even get to the ignition sequence.

 

[Aquazone]

You need to follow the voltage from external controls all way back to boiler, as is sounds like it is sitting idle. Just because 3 port / pump goes, might be a broken wire on SL to boiler.

 

[Whyme]

You have switches in the 3port and even if the sychron motor moves the the switch your port head may be knacked, then its a new head..try pushing the lever to manual if it doesnt fire look at that first.

 

[Billy Bob Bob]

Andrew pm me your gas safe numbers so i can check you out and put you in the gsr only forum,until then i am closing the thread,once i know your gsr you can ask any gas related posts in there and folks can give you the right answers