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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 14382
Experience:  15yrs in the HVAC industry with certificates and degrees.
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Have 2 zone ac/heat that I'm replacing old controller board

Customer Question

Have 2 zone ac/heat that I'm replacing old controller board with a Honeywell HZ221 board. Thought I could connect properly but must have something wrong and didn't take picture of previous wiring to look back at. It's not a heat pump. After finishing wiring I turned power on and set thermostat to cool. It came on but Heat lit up instead of cool.
Submitted: 1 year ago.
Category: HVAC
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond as typing, researching and adding links takes me time to do so please be patient and often I will ask you questions to narrow down the issue so do not rate me until we are done thanks.

What wires do you have connected to what connectors on the unit? PLease list all of them

Customer: replied 1 year ago.
Equipment: red-R, blue-C, white-E/Aux, yellow-Y, green-G. I think brown was also connected with yellow in Y but it isn't connected at all now.Zone 1: damper yellow-m1, red-m6
Thermostat red-R, blue-C, white-E/Aux, yellow-Y, green-GZone 2: damper blue-m1, white-m6
Thermostat red-R, blue-C, white-E/Aux, yellow-Y, green-G
Expert:  HVAC Guru replied 1 year ago.

It all seems correct, let me see if anyone else can assist as I see nothing wrong with that wiring.