My Prima F50 has been giving me a lot of grief of late. In Jan it stopped igniting about half an hour after start up but continued to run, you could smell gas fumes outside. An engineer said it was either the fan or the PCB, he replaced the fan but this did not solve the problem so I replaced the PCB (with a second hand unit) and it worked for about a month. Now it trips its reset switch once or twice a day, I think it does this before it's timed to go on. I see that one engineer suggests that this could be an airflow switch problem on another site, is this likely to be the case?
Potterton Prima F50 trips out
- Thread starter munkjack
- Start date
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Well an air switch won't cause a problem before the boiler's on...
Perhaps you should get an engineer in. If the Overheat Reset button is popping out then it might be overheating??? That's nothing to do with the fan or the pcb. It sounds like you have, or have had, more than one problem.
Perhaps you should get an engineer in. If the Overheat Reset button is popping out then it might be overheating??? That's nothing to do with the fan or the pcb. It sounds like you have, or have had, more than one problem.
Overheating when it should be off and smells of gas sounds as it could be a dangerous situation and I would recommend that its checked by a competent CORGI engineer but not just one who cannot diagnose the fault and changes parts in case that fixes it.
It almost sounds as if the gas valve is leaking when off although thats thankfully rare.
Tony
It almost sounds as if the gas valve is leaking when off although thats thankfully rare.
Tony
The gas smell problem has been fixed by the new fan & pcb. I need to try to analyse precisely when the reset button is tripped, it could be an overheating issue. Finding someone who can do more than replace parts is v.difficult, do you know anyone competent in the Lewes/Brighton area?
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"""it could be an overheating issue"""
Surely, if the overheat stat is operating then why dont you accept that the boiler is overheating?
Does anyone remember if the Prima F has a built in pump over run?
A common cause of tripping the o/h stat is if the boiler goes off and there is no pump over run or gravity circulation.
It could also be over gassing or scaling up. Did the CORGI measure the gas burner pressure?
Tony
Surely, if the overheat stat is operating then why dont you accept that the boiler is overheating?
Does anyone remember if the Prima F has a built in pump over run?
A common cause of tripping the o/h stat is if the boiler goes off and there is no pump over run or gravity circulation.
It could also be over gassing or scaling up. Did the CORGI measure the gas burner pressure?
Tony
I'm happy to accept that it is an overheating problem.
If the button under the boiler that you reset (without having to remove the cover) is the overheat stat then that would appear to be the case. I don't know if the CORGI measured the burner when he installed the fan.
If the button under the boiler that you reset (without having to remove the cover) is the overheat stat then that would appear to be the case. I don't know if the CORGI measured the burner when he installed the fan.
The other issue is that the o/h stat trips at about 95°C but the boiler thermostat will allow the boiler to get up to about 90°C.
A always advise people not to set the boiler stat above "3" and suggest "2½" as suitable.
Tony
A always advise people not to set the boiler stat above "3" and suggest "2½" as suitable.
Tony
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