worcester 18ri greenstar goes off when case refitted

[DerekJB]

Hi Guys thanks for all the suggestions, unfortunatley none of them were correct, it turned out that the sight glass at the top of the heat exchanger had gone into the burner causing the the burner to run at very high temp which damaged the gas valve and fan, which is also why it would run with case off but not when on as it got the extra air through the hole left by the sight glass, evidence found was cracked solenoid casing and discoloration, and soot inside fan vanes, hope this helps someone in the future,
thanks to all who replied to original question.

 

[arran197]

Bloody hell, that's a weird. Who did that then? Sounds expensive! Why Worcester felt the need to put a sight glass there is beyond me anyway, you can't see bugger all, even with that so called 'mirror'!

 

[Petefinny]

Its a case seal problem, had one of these before, everything looked fine andcould not solve the problem and had to give up and ring the manufacturers and get them to send an engineer! Spome times you just have to give up.

 

[vern]

Bloody hell, that's a weird. Who did that then? Sounds expensive! Why Worcester felt the need to put a sight glass there is beyond me anyway, you can't see bugger all, even with that so called 'mirror'!

They have been blanked off with a steel plates for the last few years now for this reason