Carrier DHMVHA Service Manual page 38

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DIAGNOSIS AND SOLUTION (CONT.)
Indoor units mode conflict (match with multi outdoor unit)
Error Code
Malfunction decision conditions
Supposed causes
Cooling Mode
Heating Mode
Fan
OFF
NOTE:
No: No mode conflict
Yes: Mode conflict
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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The indoor units cannot work cooling mode and heating at same time. Heating mode has a priority.
Indoor unit A is operating in the COOLING or FAN mode, and the indoor unit (B) is set to the HEATING
mode, therefore unit A powers off and unit B begins operating in the HEATING mode.
Indoor unit A is operating in the HEATING mode, and indoor unit B is set to the COOLING or FAN mode,
then unit B changes to the STANDBY mode and unit A will not change.
Cooling Mode Heating Mode
No Yes
Yes No
No Yes
No No
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Fan Off
No No
Yes No
No No
No No