Potterton performa 28 combi

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Christopher buzzard

Christopher buzzard

Gas Engineer
Messages
190
Hi all. Got called to the above boiler which had an intermittent hot water fault. Had it for 2 weeks and gradually getting worse. Went on Friday and couldn't get it to fault. Had it running for 5 minutes and it didn't drop out once. Kept turning tap on and off but still no fault. The customer said that the radiator icon on the front panel flashes and boiler has to be reset to get it working again. Done usual checks, burner pressure. Checked fan which seemed ok. Rang technical and without it going to fault they weren't much good. Customer has rang again today to say it's playing up again. Can anyone point me in the right direction for things to check or has any1 experienced this fault. Regards to the Heating side, I tried that and it didn't go to fault but female customer said it would go to fault on Heating also, where as the male says it's hot water only that fault occurs.

Regards
 
If rad symbol is coming on check the diverter is working correctly
 
IMG_0804.PNG
I could see when hot tap was turned on the pin from the hot water pressure differential valve was operating the micro switch to bring on the boiler. Just couldnt tell if it was going down the Heating as it was already on when I got there. Number 28 on the picture would come on so customer said.
 
Depends could be a fault eg over temp or a ch fault
 
Had an intermittent fault on the equivalent Baxi a few weeks ago. Turned out to be the pump was at fault. It was running ok but didn't have a lot of grunt left in it. You could stop it rotating with a screwdriver. So it wasn't distributing the heat fast enough when it was getting up to temp and going to fault. Just a thought.
 
No water temp is fine. The fault is that after running the boiler on hot water the boiler will just Randomly cut and go to fault. The radiator icon with line through it( see pic) Water will run cold until the boiler is manually reset. It will then fire up. Sometimes it is fine and others it will go back to fault again. They can run a bath 1/4 full with hot water. Like I say it wouldn’t do it when I was there.
 
He has just txted to say when hot water is running he can hear the igniter continually clicking away. After the boiler has ignited am I right in thinking the ignition process should stop once flame has been established.
Not sure if related. Just thought i would say
 
correct shouldnt go more than 5 secs once flame
 
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