Hi
I have recently replaced numerous TRV valves with like for like (Myson II), didn't replace the pipe(s) just the sensor head. The originals worked fine and I could adjust the temperature up & down the settings.
However, the new valves I can only either turnthe radiator on to highest temperature or "OFF." If I set the valve to setting "III" the temperature does not adjust.
I have checked the pin and the fact that I can turnthe radiator OFF must indicate the pin is moving / operating.
Any suggestions what to do next would be greatly appreciated.
I have recently replaced numerous TRV valves with like for like (Myson II), didn't replace the pipe(s) just the sensor head. The originals worked fine and I could adjust the temperature up & down the settings.
However, the new valves I can only either turnthe radiator on to highest temperature or "OFF." If I set the valve to setting "III" the temperature does not adjust.
I have checked the pin and the fact that I can turnthe radiator OFF must indicate the pin is moving / operating.
Any suggestions what to do next would be greatly appreciated.