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i have a vokera 20 -80 RS flowmatic?

I have a mira excel shower and for the last few weeks the water is going hot and cold when having a shower the boiler cuts out then starts up again. is there a stat in the boiler i can replace or can you tell me the fault.
Gordon young, March 2008
Differential air pressure switch dropping out due to dirty venturi. Google 'vokera flue venturi'. Properly a job for competent corgi man.

c, March 2008
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