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Thanks. So, the problem is with the valve, not the head (Actuator)? I thought the valve is not sticky...

Hi all, These few days, finding the radiator hot. The programmer shows CH OFF. Checking the mid-position valve (with A3MID Acuator head) finds that the pipe to the radiator (connecting to Port B) is hot. Removing the cover of the head so I can see the motor, springs, etc. and did the...