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what is error e20 or nct fault in a Potterton Promax combi boiler? ?

The boiler is saying e20 error which is an nct fault, can anyone tell me what this means? Thank you!!
Ian, January 2010
What is E20 on a potterton combi boiler.

Julie sharp, December 2018
Ian - Is it normal for both the water and central heating not to work whilst getting the E20 error?

Help, January 2011
I have got the same problem with my boiler, the E20 pops up. I don't know if this is of much help to you:

http://www.potterton.co.uk/docs/Pot_gold_combi18HEA_Users_sept_10p.pdf

On Pg.8 it basically says, 'E20 Central Heating NTC Fault'.

Awaiting input ...

Thanks.

Help, January 2011
do you mean ntc? if so, it's the temperature sensor that needs replaced.

Ian, January 2010
link Click here to see other fixes for Potterton.