The NTC thermistor then assumes (incorrectly) that the rest of the water in the heating system is up to temperature, and cuts off the gas supply. The Fix As well as the boiler, you’ll also have a cold water storage tank (also known as the expansion tank) which has to live above the boiler to feed water through using gravity – most people have theirs in the loft. A third mode of failure of the Siemens board is where the ignition sequence starts and either stops before the burner ignites, or the burner shuts down shortly after ignition and before the boiler has properly heated up. Sometimes confused with thermistor failure. Sorry to tell you this but I don’t repair the troublesome Suprima HE. I’ve only written about it here for completeness.)

In this guide, we have outlined the five most common problems you are likely to encounter with your Potterton boiler. We have explained what the cause of the problem is likely to be and also what is needed to fix it.

Similar Boilers to the Potterton Suprima 30L

The Potterton Suprima HE is a new(ish) and completely different design of boiler despite bearing the old Suprima name. About the only thing it has in common with the previous Suprima boilers is the compact cast iron heat exchanger. Everything else inside is different. Not very successful in terms of sales for Potterton and I think it is now discontinued. I’ve only ever been called out to fix a few of them so I don’t have much depth of experience but here are the faults I’ve seen and/or know about: Then there’s limescale. When limescale attaches itself to pipes and components, it burns hotter than other sections of the heating system. Basically, hot water that is meant to be directed to your bath, shower or taps, is leaking through the diverter valve. The Fix To ensure that you’re installing the most suitable boiler for the heating and hot water demands of your home, it’s important to look at the output rating, efficiency, warranty and potential cost.

If the boiler still won’t light, or the red light keeps returning, there is a fault which you will not be able to clear with the normal user controls and you need to call and book a visit from a boiler technician. Call me if you wish, on 07866 766364. If you have an older boiler, you might, therefore, want to consider replacing the whole boiler with an energy-efficient new boiler that could end up saving you money in the long run. # 3 – Cold Return PipeA new Potterton combi boiler is energy efficient too, so your hot water and heating should cost as little as possible to provide. Benefits of a Potterton combi boiler