combi. hot water rumble ? Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[temps]

worcester combi (model on boiler says C1) .......! ! !
working fine accept when ask for hot water, after a few seconds starts to rumble, pressure gauge flickers, then rumble dies off. d.h.w gets hot and is fine. blockage in exchanger? please help guys.

[Steve the gas]

Hi Temps,

Can you see if you get 'flame lift' ?