Combi boiler pressure keeps dropping?

Could be leak under the floor,not easy,how long pressure last ,if 4hours and drop back to 0 you are with out heating ,if not under floor the main heat exchanger has pin hole

ltd
March 2012

download the service pdf manual, and refer to the fault section,theres some mention of a pressure micro switch.

iam no boiler man but the service manual is a must have,

I downloaded it out of curiosity after reading your post,

just thought I would mention that,it may help you troubleshoot the system.
Gud luck...

paul
March 2012

I don't think SD read the question....but thanks for trying

Jaydee
March 2012

If the pressure is dropping, you have a leak. where else do you think it is going to go. spirited away.

SD
March 2012