URGENT PROMAX PROBS

[craigmorgan37]

Any ideas why the Hot Water indicator light would stay on for up to an hour after the tap is turned off?
Potterton Promax Combi HE 28.
Boiler not staying ignited, fan and pump running

 

[ShaunCorbs]

Flow switch

 

[craigmorgan37]

Flow switch

Only happening when bath tap has been running, sinks and shower doesnt happen.

 

[Aquarius]

Only happening when bath tap has been running, sinks and shower doesnt happen.

Bath tap usually on for longer periods than Sink, basin and shower, inclined to agree with @ShaunCorbs