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Two items you may not have done…..
.. did you perform a reset on the thermostat after replacing control module for zone 2?
.. the old Zone 2 module should had had a terminating resistor installed to tell thermostat CANBUS that zone 2 is “ End of line” if it’s not installed that will cause CANBUS communication errors.
**** also you stated you swapped 8n a telephone line and did you wire it correctly? A standard 4 wire phone cable with plugs already installed from a store is Not Wired correctly
*** yo7 also state NO power to Zone 2 A/C unit… is this no 12 volts DC or no 120 volts AC
ANYTIME you swap a cable, a control module, thermostat, etc you MUST do a reset on the system so that CANBUS Comm can be reestablished across the CANBUS line
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