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Yep venturis fall apart and can stop the diaphragm moving enough 24mm ring spanner required for changing them
Then check in hole for...
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If you’re having issues with the hot water switch making
https://ebay.us/m/lR5eb4
I’ve had good results with the above.
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when the heating has been on for about 20 mins check to see if pressure gauge is rising into the red if so expansion vessel needs...
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No, these were in Rushden. The only money they liked spending in Thrappo was on their own offices.
