worcester greenstar ri no hot water

[Super Mario]

Unvented System boiler im guessing its either the programmer or 2/3 port valves heating all ok though any ideas??

 

[Riley]

Or thermostats on cylinder

 

[gassafe]

Normally a 2 port, espically if it's a cheap one supplied with the cylinder... Sometimes just changing the motor in the powerhead is enough

 

[Dotty]

Moved off open forum.