You are not right in diagnosing anything without any appropriate tests.
They are a common failure point ( after the diverter valve ) and uniquely located where a DIYer could just about replace it without infringing limitations on DIY work on boilers as it does not need the combustion chamber to be opened.
If you removed it and measured the contact resistance about 10-15 times and consistantly obtained less than 1 Ω then it is probably OK. You only activate the switch by blowing TOWARDS the +ve air connection.
A gas engineer would also measure the applied differential pressure!
the home owner tells me that divirter was changed last year. thinking about it does the fan have a venturi as a blockage would produce the same fault. sorry for the silly questions but im only used to the newer condensing boilers
You are not right in diagnosing anything without any appropriate tests.
They are a common failure point ( after the diverter valve ) and uniquely located where a DIYer could just about replace it without infringing limitations on DIY work on boilers as it does not need the combustion chamber to be opened.
If you removed it and measured the contact resistance about 10-15 times and consistantly obtained less than 1 Ω then it is probably OK. You only activate the switch by blowing TOWARDS the +ve air connection.
A gas engineer would also measure the applied differential pressure!
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