While you wait for answers, we may have found some information which could help you.
Click here for Myson Radiator Workmyson trv 2 way?
How can i over-ride the Myson thermostat's PIN number?
My Myson thermostatic radiator valve is not working and will not open?
Myson Apollo 30s plenty of hot water but rads only warm, ?
Myson thermostat won't click on?
apollo myson 50?