ariston faulty sensor

[taddy]

Hi does anyone know which switch is the one to change if your combi boiler fails to light, sometimes but not always on either heating or domestic hot tap activation.

When it fails to ignite I have to turn it off on the red off button whilst leaving a hot tap running, wait to hear a click then turn it back on and most times it lights first time but not always.
I would assume it's a water flow or pressure drop sensor fault.
Any help would be appreciated.

 

[Billy Bob Bob]

could be a pcb fault if not detecting try here Gas Safe Register | Ensure your gas engineer is registered with Gas Safe Register

 

[taddy]

Cheers I'll have a look at changing it. Mick

 

[Reltub]

Pump could also be on the way out. ie opening the hot top to release some heat