All you need to do is switch your boiler off from the mains , then in the lower left corner give it a good punch 5-10 times , turn it back on at the mains and give it a moment ..... YAY YOUR BOILER IS AS GOOD AS NEW !!
Jeffery Hamilton, April 2019
no connection and the bang worked so thankyou
rachel, February 2016
What is code no cn
Tom, November 2014
plumbers trick works lol
notoferroli, July 2013
A plumber's tip which is sure to work - switch your boiler off from the mains and bang on the lower left hand side of the boiler 5 - 10 times. Switch the power back on and hey presto - your boiler will be working again!
I had the same NO CN error message and found this advice on another site. (It's something to do with the alignment of the PCB board and a little knock is all it needs to get back into place). It worked for me so I thought I'd pass the advice on! Good luck everyone!
Lil' Helper, March 2011
no connection, had to get engineer out.
chris pooler, January 2010
NO CN - what does that ...g mean!
ITS NOT IN THE ...G FERROLI HE 31 MANUAL.
SERVICE ENGINEERS BULL FOR A JOB THEY'LL JUST CHUCK A CIRCUIT BOARD AWAY AND REPLACE I BET
JOCK, April 2009
Just got this problem. Anybody know how to resolve it?
Craig, March 2009
i have the some problem! Help???
simon, December 2008
i had the same problem with my boiler, i joined with british gas homecare which was excellent, it was low pressure in the system and a problem with the electronic board, got them sorted and it hasnt happened since
