38MGR-04SM Specifications subject to change without notice. 35
DIAGNOSIS AND SOLUTION (CONT)
Indoor units mode conflict (P5)
• No: No mode conflict • Yes: Mode conflict
Error Code P5 (old model) or - (new model)
Malfunction decision conditions
The indoor units cannot operate the Cooling mode and Heating mode at the same time.
The Heating mode has the priority.
Supposed Causes
• Suppose indoor unit A is operating under the Cooling or Fan mode, and indoor unit B is set to the
Heating mode, then unit A turns off and unit B operates in the Heating mode.
• Suppose indoor unit A is operating in the Heating mode, and indoor unit B is set to the Cooling or
Fan mode, then unit B enters the Standby mode and unit A will not change its operation.
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
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