Potterton Promax System HE Plus E133 Error

Went to loot at a Potterton Promax System boiler which had gone to lockout and was displaying the error code E133. "Interruption of gas supply or flame failure."

Assumeing the gas supply had not been interrupted, I removed the ignition electrodes to find that the two probes were almost touching each other, and there was a bit of carbon bridging the gap. They had obviously bent together with their prolonged exposure to high temperatures. Bending them back to their correct gap would have been a wast of time, as they would soon bend in the heat again. Replacing the electrodes was the only long-term solution to the problem.

Disclaimer: The works described in this blog are a record of work undertaken and should not be taken as guaranteed to solve your problem. Work should only be carried out by persons qualified and competent to do so.