Potterton service and repair
I specialise in boiler maintenance, including the service and repair of Potterton boilers. Potterton is a subsidiary of Baxi, hence some of theirs boilers are identical or share similar components. The models I am most familiar with are the older standard efficiency(SE) Suprima and Promax HE versions, and the newer high efficiency(HE) Promax and the Baxi derivatives including the Performa.
Common problems with the Potterton Promax HE
On the Potterton Promax the most common issue I tend to come across is related to the primary flow switch or pump proving switch. The flow switch determines whether or not the pump is running. Usually faults with these present themselves with a leak from the O ring seal, which yo would notice as a leak beneath the boiler. You can just replace the O ring, but it usually makes more sense to replace the whole switch – especially if the boiler is located downstairs – as they can fail without leaking. If the boiler is installed downstairs then most of the system needs to be drained down before the flow switch can be removed.
When the pump fails or starts to fail the boiler won’t work either. This isn’t a fault with the boiler but it has the same effect and the boiler will come up with the same fault.
Note: On the Promax boilers you can’t see the fault code without removing the cosmetic cover first. The older Potterton Promax HE boilers don’t exhibit fault codes.
Another common issue with some of the Promax boilers relates to the burner failing. When this happens you usually experience explosive ignition(a loud bang), or a series of loud bangs every time the boiler fires up. Some of these boilers were fitted with burners which were prone to failing. Replacement burners are ceramic and fix the problem. If your boiler is exhibiting a loud bang when it fires up then its probably time to get it looked at.
I had an extreme case where a boiler was banging three or four times before it fired up. This appliance wasn’t safe to use and was turned off and repaired the following day. There is a video and some images below from this particular boiler.
Common problems with the Potterton Suprima
Printed circuit board
The Potterton Suprima was manufactured with an inherent printed circuit board problem. The Potterton Suprima has several different derivatives. The one I am referring to is the most common which is the Standard efficiency version commonly known as the 30L, 40l or 50L etc.
The PCB’s would fail prematurley and cause the boiler to stop working. This fault usually starts off with the boiler going to intermittent lockout needing to be reset. Sometimes several attempts are needed to get it going again. Often the boards fail altogether and cannot be reset. Most of these problematic printed circuit board’s have been replaced now but I still come across the odd one which hasn’t been upgraded.
Below on the left is and image of an original printed circuit board. The one on the right is what an upgraded replacement printed circuit board looks like.
Common issues with Potterton boilers include the following.
Boiler loosing pressure.
Central heating, no hot water.
Hot water, no central heating.
Poor hot water delivery.
Printed Circuit Board issues (Suprima).
Flow switch failure on Promax models(including leaks).
Burner failure on some Promax models.
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