C & M Calydra 100 combi

[Rusty]

Hi all, I have a C & M Calydra 100 combi that has no DHW, but is running ok for Heating. DHW works ok as in fires boiler on demand but no hot water, was thinking either Heat Exchanger or PCB, as no diaphram to my knowledge. Only other thought is could it be a water throttle problem.
Your thoughts would be appreciated. 😀

 

[stevetheplumber]

not a diaphranm if boiler is firing on demand

 

[Rusty]

I'm pretty sure this hasn't got one anyway, that's why I raised the question of a faulty water throttle valve other than PCB or Heat X 😀

 

[GreenArmy]

I would suggest water throttle head. Cost about £25. Disconnect lead to throttle head and connect to new (out of place) fire up (turn tap on) and manually push up throttle. If it works you can then remove old throttle and fit new one. Before you do that, pull off the lead to the thermister in the hot water tank (in combi) and see what happens, if you get hot water then replace thermister.

 

[Rusty]

Thanks for the replies, turned out to be the 3 way valve