I have zone heating:
• I have a CM709 Honeywell installed on the second floor
• I have the ST9400C installed on the ground floor
• Why is it not possible to turn on the heating only on the second floor using the CM709?
• I have a CM709 Honeywell installed on the second floor
• I have the ST9400C installed on the ground floor
• Why is it not possible to turn on the heating only on the second floor using the CM709?