Indoor Units Mode Conflict (P5) - Carrier 38MGR Series Service Manual

DIAGNOSIS AND SOLUTION (CONT)

Indoor units mode conflict (P5)

Error Code
Malfunction decision conditions
Supposed Causes
Cooling Mode
Heating Mode
Fan
Off
• No: No mode conflict
38MGR-04SM
P5 (old model) or - (new model)
The indoor units cannot operate the Cooling mode and Heating mode at the same time.
The Heating mode has the priority.
• 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
No
Yes
No
No
Specifications subject to change without notice.
FAN
Yes No
No Yes
Yes No
No No
• Yes: Mode conflict
OFF
No
No
No
No
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