How To Test Pump In Vaillant Turbomax Boiler? (Fault - F24)

[ReganAndCarter]

I've got a 2004 Turbomax Plus 824e combi. Recently it has started to lock out with an F24 fault, which according to the manual is 'dry fire protection - air in boiler, pump blocked or defective, pump output too low'. This problem started as only a couple of times a week, but now it is happening every other time we use hot water. I spend all day going to the boiler to re-set. When the boiler is running, it will run all day - but odds are next time I use it, it will be locked out.

Early this year, we had a problem with the hot water going hot and cold so I changed the plate heat exchanger and fitted a Magnaclean which sorted it. I'm thinking that there may still be debris in the boiler that is causing the F24 fault.

I intend to - (A) test the pump's performance and (B) remove the pump head to see if it needs a clean. I'm OK with (B), but how do I check the pump to see if it is failing? Is there a way to check it's output and performance. I don't really just want to swap the pump if it's OK.

Thanks for any help and advice.

 

[ianmcd]

More likely to be a known fault which sorry I cant tell you how to sort it as it involves gas work and we are not allowed to advise that on here, do what you suggest, I am not a believer in pumps running slow,but you never know

 

[ReganAndCarter]

Thanks for your reply. Reading between the lines and taking a reasonable guess, the other possibility may be blocked main heat exchanger. Don't worry, I'm not going to be opening up the combustion chamber. I know my limits.

 

[steve32]

Have a look in boiler faq's finger test, posted by one of the top 100 boiler engineers in London

 

[DP]

Have a look in boiler faq's finger test, posted by one of the top 100 boiler engineers in London

You having a laugh are you?

 

[ReganAndCarter]

Have a look in boiler faq's finger test, posted by one of the top 100 boiler engineers in London

Ok, thanks - will do.

Can only be Mr Agile.

 

[AGAS]

Could be very easily be something else for f24

 

[ReganAndCarter]

Could be very easily be something else for f24

Are you allowed to say?