Carrier 40MBDAQ - Page 43

40MBDAQ: Service Manual
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DIAGNOSIS AND SOLUTION (CONT.)
P5 (Indoor units mode conflict (match with multi outdoor unit)
Description: The indoor units cannot work in the COOLING mode and the HEATING mode at the same time because the
HEATING mode has the priority.
• If indoor unit A is operating in the COOLING mode or the FAN mode, and indoor unit B is set to the HEATING mode, then unit A powers
off and unit B operates 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, then unit B switches to
the STANDBY mode and unit A does not change modes.
Table 11 — Modes
NOTE:
• NO: No mode conflict
• YES: Mode conflict
COOLING MODE HEATING MODE FAN OFF
COOLING MODE
No Yes No No
HEATING MODE
Yes No Yes No
FAN
No Yes No No
OFF
No No No No