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I am well aware that the explosive ignition and the electrode problem are different. The explosive ignition is cured by improving the gas flow. The flame detector issue just causes the gas to go out after it has been on for a couple of seconds. Cleaning the electrodes works up to a point but...

5 years on and my fix has proved a success. No more explosive ignition. All you need to check now is the electrodes. The flame detector is very sensitive and requires the electrodes to be changed probably about once per year.

The modification is still working perfectly after a year. You only have to open the front cover of the Suprima 120L to see the potential problem. I shall try and get some photos. Anybody interested send an e-mail MOD 2 put your e mail in your profile please

Just in case everybody was worried that I might have been launched into outer space by the explosive ignition, I shall put your minds at rest. The saga continues but just possibly may becoming to some sort of conclusion. Since the last posting, the 2 foot of 15mm pipe has been replaced with...

I'll describe the whole setup. There are in fact 3 gas boilers and a couple of gas hobs being fed from the single meter. The last to be installed was the boiler for the pool. The gas feed for this is taken directly after the meter and runs for about 100 feet in that standard yellow plastic...

1: There probably is an opportunity here to enter the firework business. Perhaps I shall loosen the wall mountings and see if the boiler will launch itself into outer space. 2: The pool is in an insulated brick building. So heat loss is minimal, especially if you keep the air temperature at...

The new electrodes and associated wiring were installed. It turns out that the diagram showing the wiring of the flame detector is reversed and therefore wrong. Just out of curiosity, using the old wires, I made up a cable with the wiring as per the diagram. As expected the flame detector did...

The first board fitted when the boiler was new was: 5106584 Issue 02 dated 30/02 The board fitted now is: 5106568 Issue 03 dated 26/04 Strange that the later board has a lower number. I am worried about this business of fitting the electrode connections the right way. The HT...

The start up sequence is as follows. First the fan starts. Initially with a slight woosh and then dies down to a lower speed. After 10 seconds you can hear the sparks start. These last for about a second or so. The solenoid on the gas valve opens at the beginning of the sparks. So up to this...

This Potterton Suprima 120L is connected to a heat exchanger which in turn heats a swimming pool. The explosive ignition started after about 18 months and gradually got worse. The Corgi engineer contacted Potterton and they suggested getting the PCB upgrade kit, which consists of all the...