Carrier 40MAHB Series Service Manual page 36

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Indoor Units Mode Conflict (match with multi outdoor unit)
Description: The indoor units cannot operate in the COOLING mode and HEATING mode simultaneously. The HEATING mode is the
priority.
Examples:
• If indoor unit A is operating in the COOLING mode or the FAN mode, and indoor unit B is set to the HEATING mode, unit A will power
off and unit B will continue to operate in the HEATING mode.
• If indoor unit A is operating in the HEATING mode and indoor unit B is set to the COOLING mode or fan mode, unit B will change to
STANDBY mode and unit A will not change modes.
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.
COOLING MODE HEATING MODE
No Yes
Yes No
No Yes
No No
FAN
No
Yes
No
No
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OFF
No
No
No
No