Myson Apollo boiler thermocouple repeated failure

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I have a myson apollo boiler and I have had to replace the thermocouple a number of times over the last few years. Anyone got any idea why they would keep breaking?

Cheers
 
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replacing a thermocouple is a RGI job, but they do burn out relatively quickly.
 
Proactively replacing the thermocouple on an annual service used to be the norm.
 
The honest answer is like light bulbs manufacturers could make them to last lifetime but where is the money in that.
Also too big a pilot flame can burn them out faster
On other types of t/couple they make nickel plated ones that last ages and only cost a quid more but unfortunately they dont for the apollo
 
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I have an apollo on my books that burns through the t/c about every 18 months, or did. I now replace it at every annual service as Baxpoti has stated.
 
Thanks for your answers, much apreciated.

What is generally covered in an annual service and how much do you think i should expect to pay?
 
Pilot burners aka pilot tops seem to go on these. Might be worth getting a new one and this should throw the right flame onto the T/C. An over-aerated flame burns hotter and eats thermocouples. I often renew the injector while I am at it.
 

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