Baxi 105e?

The rear pin is the PUMP PROVING MICROSWITCH
Which will always move for heating & hot water

The front one is the DHW MICROSWITCH
Which should only work for hot water

Asbestos
August 2017

More searching throws up some suggestionbs:

http://www.ultimatehandyman.co.uk/forum1/baxi-combi-105e-water-only-on-but-rads-get-warm-t49846.html

http://community.screwfix.com/threads/combi-boiler-heating-rads-when-on-water-only.134087/

http://www.urbanplumbers.co.uk/baxi-105e-instant-hot-water-problems-boiler-repair-blog/

https://www.superwarm.co.uk/5-common-faults-of-a-baxi-boiler-and-how-to-fix-them/

You will doubtless have already seen much info like this with your own Google searches. It may be more fruitful to post in a dedicated plumbing/heating/boiler forum than on a general purpose site like this one.

acp
July 2017

Thanks for the response, however these do not really answer the question, I have replaced both the diaphragms in the diverter, and the pins move out smoothly, the question is - when the system is calling for hot water only should both the pins (hot water and CH)on the diverter be moving out and engaging the microswitches, or should only the hot water pin be moving?
Thanks

nigel56
July 2017

https://www.avforums.com/threads/baxi-boiler-problem.939326/

https://www.diynot.com/diy/threads/baxi-105e-when-switched-to-hot-water-only-heating-turns-on.182099/

acp
July 2017