Hello,

Have a Potterton Powermax HE boiler and it seems to have developed the following fault codes of E.00 and E.42 which causes the boiler to go into lockdown after 10 mins of the heat being turned on. Anyone know what these codes mean? Potterton will send out an engineer to fix for £289 but just wanted to check this is not a quick and easy fix before booking them!

We have bled the radiators and re-pressurised just incase that would help.

Thanks in advance for your help.

spd81, December 2009

the condensation trap on the one side fills up to the top the boiler then stops and goes into red fast flashing mode if I take the tank off and drain it also wash it out the boiler will then work for about a week the stop again

j jones, March 2014

re. the Promax FSB 30 HE, a difficult one to deal
with, lots of hand tearing metal edges not properly
finished. To put right a cutout problem I had, found the sensor lead at the probe end had come away inside the insulator [not visable] a gentle tug revealed a corroded end to the wire, removed a10mm of insulation pushed the new end back to the insulator sleeve and presto. 'Fixed' No local Plumber/Heating humanoid was interested just
did not return calls, I retired from the trade
to early or probably not.

ydai, November 2013

e42 is a control panel error and, if restarting the unit doesn't fix it, you need the control panel replacing PLUS 2 other parts due to compatibility issues.
I have the same issue, and would like to know if Potterton DID fix yours for just £289 as the control panel part alone should cost around £600...

peej, September 2010