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Thanks for your replies guys! Yeah that seems to be it! I tried cycling it after tapping it with a metal rod and it is now cycling freely! Will order a new one but that should keep her warm in the meantime! Thanks again!!

Hi all, the mother in law has a Potterton promax combi he plus which is stuck in DHW mode causing the central heating not to come on. When visiting today, I noticed the 'tap' led was permanently lit despite no DHW demand and the heating thermostat requesting heating. The boiler does try to...

Thankyou Picasso and Ianmcd - you were both absolutely correct! The Venturi had indeed broken up! Nice and easy fix - just a 24mm spanner to remove and some grips to remove the 1-way check valve from the assembly. I would've struggled to get an adjustable wrench in there but thankfully had a...

Wow thanks picasso, super quick reply! I was so busy searching for 'diaphragm' that i must've missed this! The posts do indeed look to be what im looking for. Ill get one ordered and report back asap :D

Hi All, Moved house ~6mths ago and inherited this boiler which is ~11y old. Its always been very lazy to turn on for hot water demand. The Kitchen Tap with an aerator needed to be on full, and the shower needed to be run high and hot for it to stay on. A few weeks ago i repaired the common...