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Potterton Promax HE Plus LPG (Error E164)?

Please can anyone advise urgently on a Potterton Promax HE Plus LPG showing Error E164. Got no hot water and messy child urgently needing a bath.
Liz, September 2008
Having the same problem which is how I found your question.

Have you tried resetting it? Twist the left knob counter clockwise for at least 3 seconds.

If this works, you may need to do it each time to start it

James, October 2008
link Click here to see other fixes for Potterton.