Potterton Profile 40e problem

[Robert Tyrrell]

Morning ladies and gentlemen,
I attended a call first thing this morning to deal with a boiler that wasn't behaving correctly and after checking everything that I can think of, I thought I'd ask on here:

Symptom - first thing in the morning the boiler takes around 20 minutes to kick into life, but once started it runs fine.
What I've done - checked the 3 port for activity on CH & DHW
checked the stat(s)
checked the gas rate/burner pressure
checked the pump
checked the flue for partial blockage

I can't think of anything else that I could check, and I have no idea why it takes longer to fire up in the morning.
Last service was in February.
Any ideas?

 

[Last Plumber]

Did you check the venturi on the fan is clean and check the air pressure switch?
It may run better once it's fired and warmed up during the day ( if it's off overnight).

Is the fan running in the morning for the 20 min or is it that nothing happens for 20 min before the fan runs?

https://www.google.co.uk/url?sa=t&r...0e.pdf&usg=AFQjCNF9JRuvAKtkqtPNKSQ4Z9cf1W9S4w

 

[Robert Tyrrell]

Did you check the venturi on the fan is clean and check the air pressure switch?
It may run better once it's fired and warmed up during the day ( if it's off overnight).

Is the fan running in the morning for the 20 min or is it that nothing happens for 20 min before the fan runs?

Thanks for the info - didn't think to check the APS so I'll have to return next week and have a look at that, as for checking the fan in the morning when it switches on - I'm not awake at the time they get up so I don't think I'll be checking that myself

 

[RoryD]

I think you'd have to be there to check if it is receiving a demand in real time which I presume is impractical. The APS has been a problem, check the tubes. If memory serves me well, the thermostat control has a phial running from it. I have had them fail.

 

[bright spark]

That's an old boiler. It wouldn't b a partially blocked pilot taking a load of sparks before it lights.
Have seen that in the past.
Why don't u ask the customer t leave it off overnight and call to it first thing and see what's happening for yourself.

 

[masons]

faulty meter regulator

 

[jtsplumbing]

Known for faulty PCBs dry joint on board maybe, ask if board has been changed.

 

[spike.gb]

Is it a pilot ignition model, if so could be a partially blocked pilot, from memory the pilot sense is the metal bar that pilot flame envelopes this bar can erode a become shorter than necessary to ensure adequate sensing of the flame. A poor earth connection can also have an effect on the flame sense.

 

[Gary80gas]

Agree with Bright Spark. If its all working when u arrive, you'll be left checking everything. Better to see problem from beginning. Good luck.

 

[RoryD]

Any feedback as to how this job has gone mate.