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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7577
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Honeywell mini-zone for 2 zones. if I turn zone one

Customer Question

Hi I have a Honeywell mini-zone for 2 zones. if I turn zone one only works fine, also if I turn on zone two, but if i turn both on only zone 1 works.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: since last time the technician came to do the service about one week.
JA: Do you plan on doing the work yourself?
Customer: if is simple yes
JA: Anything else we should know to help you best?
Customer: no
Submitted: 11 days ago.
Category: HVAC
Expert:  Phil replied 11 days ago.

Hello, depending on the wiring details, which can vary with each project, it may be that zone 1 is the *master zone* and over rides zone 2. That is because it is not possible for the system to run in both heating and cooling zones at once.... so that one zone, the master zone, controls if both zones are operating.

That is the most common configuration, one master zone, and the rest of the zones or zone as a *slave zone only.