HELP: Honeywell CM709 / ST9400C Zone Heating

Joined
27 Feb 2011
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United Kingdom
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?
 
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Do you mean a 707?


Anyway.

God know. You haven't provided anywhere near enough information.

Perhaps the upstairs zone valve is after the main heating zone valve.


You'll have to wait for the crystal ball wielding members to sign on.
 
Apologise on lack if info. I am not technical in this field. I have uploaded more pic to help you.
 

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