Biasi 24s no spark

[JBseymour]

Hi, bit of a problem with my boiler I wondered if anyone can help?
No heating/DHW.
When heating/DHW demand is switched on;
pump runs,
fan runs,
but after sequence no spark then lock out comes on.

checked ohms on airflow switch and that's working, test bung is in. Flue not blocked

I have a complete boiler as a spare (was working) so swapped out Ignition module and air pressure switch but still no change. Any ideas?
thanks in advance

 

[snes]

Unfortunately, nobody on this forum is allowed to share information on gas related issues.

 

[Agile]

Stupid thing is that I expect he could have got it up and running without opening the combustion chamber!

Tony

 

[AGAS]

Stupid thing is that I expect he could have got it up and running without opening the combustion chamber!

but still could lead him in the wrong direction, if you know what i mean

 

[JBseymour]

Thanks chaps,
Hope to escape a custodial sentence this time but manual calls to check fan/venturi/pressure switch for lack of spark.
But Tony is correct looks like its related to temp probe on the DHW/flow switch manifold)
disconnected plug to switch and fired right up)

 

[snes]

Glad you got it sorted - I was going to suggest consulting the Installation Manual fault finding chart, but held back. As AGAS suggested, it might have led you into gas related areas.

Useful to have a spare boiler.

 

[Agile]

The manual also says that anyone working on the boiler should be Gas Safe registered.

Tony

 

[snes]

Indeed, well observed Tony.