Potterton Combi HE Plus A - Error E168 ?

9 Jan 2012
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United Kingdom
Afternoon all,

I have a Potterton Combi Plus A boiler, almost 2 years old, which worked perfectly until a few weeks ago.

It then locked out on Error Code E133, shown in the book as Interuption Of Gas Supply or Flame Failure.

I turned the adjustment screw for the Gas/Air half a turn anti clockwise and it seemed to cure the problem for a while, but it has now started again.

This morning it showed an Error Code of E168. I have searched my documentation but can find no reference to Code 168.

After attempting the reset knob a couple of times it then showed Error Code E133 again. It showed this a couple of times so I turned the Gas/ Air adjustment switch a touch more anti clockwise. All seems to be working satisfactory for the moment.

Has anyone any info on Error Code E168 please ?

I have just noticed a section on the Gas/Air adjustment screw saying:

NOTE: To assist the boiler to light prior to final setting, use a suitable hexagon key to wind out the Gas/Air adjustment screw until it is flush with the valve body, then turn the screw 4 full turns clockwise.

Perhaps I should try this if I get the error codes again ?.

All useful suggestions will be greatly received

Many thanks
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All useful suggestions will be greatly received
You should not be adjusting gas/air mixtures, but I guess you already know that. Get a pro to repair your boiler and ensure that it's safe. It is a simple fault to fix.
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This is really scary these gas valves are very sensitive and that guide you are talking about where you turn it so it is flush and then 4 times is a very rough guide to allow the boiler to light! Now you have adjusted the gas valve without using a suitable gas analyser to measure the Co settings your boiler is more than likely shooting up and doing serious damage as we speak! I suggest you turn it off and call a Gas safe engineer ASAP to check this and to make sure you aren't killing anyone as you read this! :eek:

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