Mitsubishi Electric PUHY-P200 Service Handbook page 113

[5-2 Outdoor Unit Control ]
(2) Starting the emergency operation (When the OS is in trouble)
1) A communication error occurs. → An emergency operation starts in approximately six minutes.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Trouble source
Circuit board failure or the power
to the outdoor units is off
Emergency operation pattern (2 outdoor units)
Emergency operation pattern (3 outdoor units)
OC
OS1
OS2
Cooling
Emergency
operation
Heating
Maximum total capacity
of indoor units (Note 1)
(Note 1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable capacity,
some of the indoor units will go into the same condition as Thermo-OFF.
(3) Ending the emergency operation
When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode.
HWE14040
Error codes that permit an
emergency operation
6607
6608
OC
OS
Cooling
Emergency
operation
Heating
Maximum total capacity
of indoor units (Note 1)
OC failure OS1 failure OS2 failure
pattern pattern pattern
Trouble Normal
Normal Trouble
Normal Normal
Permitted Permitted Permitted
Permitted Permitted Permitted
Capacity that matches the total capacity of the operable outdoor units
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Error code description
No acknowledgement error
No response error
OC failure OS failure
pattern pattern
Trouble Normal
Normal Trouble
Permitted Permitted
Permitted Permitted
Capacity that matches
the total capacity of the
operable outdoor units
OC, OS1 failure OC, OS2 failure
pattern pattern
Normal Trouble
Normal Trouble
Trouble Normal
Permitted
Permitted
OS1, OS2 failure
pattern
Trouble Normal
Normal Trouble
Trouble Trouble
Permitted Permitted
Permitted Permitted
GB