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Potterton Profile Boiler Faults, Problems and Fault Finding
This fault is a common fault on both Potterton Profile gas boilers and Potterton Prima F gas boilers (it doesn’t happen on Prima B and Prima C boilers which are significantly different).
When the Potterton Profile boiler is working correctly the fan starts up and draws air into the boiler ensuring there is adequate fresh air for combustion and that there is no residual combustible gas present. After a few seconds the raised air pressure operates the air pressure switch (APS) allowing the circuit board (PCB) to start ignition sparking and to send power to the gas valve to open the pilot gas line. The PCB senses when the pilot is alight and stable and sends power to the gas valve to open the main burner gas line. The main burner ignites and continues to burn until the boiler thermostat is hot enough.
In the fault state the fan starts, but stops within a few seconds, before the pilot burner has been lit. It then starts again, stops and starts, rhythmically, and may not go to ignition till it has run through many cycles. Occasionally the boiler completely fails to light.
Potterton Profile 50e boiler fan cycles on and off
This Potterton Profile boiler fan would cycle on and off repeatedly, every few seconds, but not go to ignition
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The old PCB from the Potterton Profile boiler had worked continuously for the last 15 years
And in his spare time Paul is working on a web site about Lake Garda in Italy, particularly Limone sul Garda, Riva del Garda, Malcesine, Lazise, Bardolino and the town of Garda itself. He's hoping to earn money by carrying advertising on the site from hotels and tour operators, travel companies and other companies linked to the hotel, travel, leisure and tourism sector. The site is PictureLakeGarda.com
Though there are cheaper “re-conditioned” PCB’s or cloned PCB’s available on the Internet we never touch these. Unless supplied by the boiler manufacturer they are illegal and may be dangerous. The box label (left) is from the genuine “interpart” 407677 PCB supplied by Potterton
This fault is most commonly caused by the Potterton Profile circuit board but it may not be as simple as that. Many boiler components interact in the ignition sequence, most obviously the fan, air pressure switch and PCB but also the overheat (limit) thermostat and main boiler thermostat, and this short cycling of the Profile boiler fan can be caused by a combination of faulty components.
With this particular boiler, changing the circuit board alone resolved the problem.
It’s possible that fault-finding may not sort out your problems or that the repair costs mean you should consider having your Potterton boiler replaced. For a replacement boiler or a new boiler installation we would recommend Worcester Bosch. Given current regulations and the work involved, boiler replacement is never cheap but sometimes a new boiler installation is the best option.
Why are Worcester Bosch our first choice for boiler replacement?
Worcester boilers are well made and the quality seems consistently high. Their technical backup is very good. The warranties on Worcester boilers are good and we’ve found that Worcester spares are readily when needed. We hardly ever have to wait long for spares.
For more about us see our lovekin.co.uk web site
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