Mitsubishi Electric CITY MULTI PUHY-P400YEM-A Service Handbook page 110

(2) Indoor unit (Cooling, heating, dry, and fan modes)
Start
Breaker
turned on
YES
Operation SW
turned on
NO
1. Protection function
self-holding cancelled.
2. Indoor unit LEV full
closed.
Remove controller
display extinguished
FAN stop
YES
Drain pump
ON
NO
3-minute drain
pupm ON
Note: 1 At indoor unit LEV full closed, the opening angle indicates 41.
Note: 2 The error code includes that of indoor unit and that of outdoor unit. In the former case, the indoor unit in question only
stops in error mode, while in the later case, all indoor units connected to the outdoor unit stop in error mode.
Note: 3 The operation mode follows the mode command from the indoor unit. However, when the outdoor unit in cooling operation,
the operation of the indoor unit will be prohibited e ven a part of indoor units or indoor unit under stopping or fan mode is
put into heating mode. Reversily , when the outdoor unit is under heating operation, the same condition will be commenced.
NO
YES
Note: 1
Note: 2
NO
Error mode
YES
Error stop
Error code blinks on
Cooling mode
the remote controller
Cooling
Error command
to outdoor unit display
Indoor unit LEV
full closed
Prohibition
Note: 1
NO
Cooling
operations
Error code
blinks on the
outdoor
controller board
-107-
Normal operations
Trouble observed
Stop
Operation mode
Heating
Dry mode
mode
Heating
Dry display
display
Note: 3
YES YES
Prohibition Prohibition
NO
Heating Dry
operations operation
Prohibition "Remote
controller blinking"
Fan mode
Fan display
Note: 3
YES
NO
Fan
operations