Mitsubishi Electric PAA-A18AA1 Manuel D'installation page 96

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Check code
E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3, U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (when compressor locked)
U2 Abnormal high discharging temperature/49C worked/ Insufficient refrigerant
U1, Ud Abnormal high pressure (63H worked)/Overheating safeguard operation
U5 Abnormal temperature of heat sink
U8 Outdoor unit fan protection stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of super heat due to low discharge temperature
U9, UH Abnormality such as overvoltage or voltage shortage and abnormal and synchronous
signal to main circuit/Current sensor error
others Other errors (refer to the technical manual for the outdoor unit.)
• On wired remote controller, check code displayed on the LCD.
• If the unit cannot be operated properly after the above test run has been performed, refer to the following
table to remove the cause.
Wired remote controller
PLEASE WAIT For about 2
minutes
following power-
on
PLEASE WAIT → After about 2
Error code minutes has
expired
following power-
on
Display After about 2
messages do minutes has
not appear even expired
when operation following power-
switch is turned on
ON (operation
lamp does not
light up).
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Symptom
Symptom
LED 1, 2 (PCB in
outdoor unit)
After LED 1, 2 are
lighted, LED 2 is turned
off, then only LED
1 is lighted. (Correct
operation)
Only LED 1 is lighted.
→ LED 1, 2 blink.
Only LED 1 is lighted.
→ LED 1, 2 blinks
twice, LED 2 blinks
once.
96
Cause
– For about 2 minutes
after power-on, operation
of the remote controller is
not possible due to system
startup. (Correct operation)
– Connector for the outdoor
unit's protection device is
not connected. – Reverse or
open phase wiring for the
outdoor unit's power terminal
block (L1, L2, L3)
– Incorrect wiring between
indoor and outdoor units
(incorrect polarity of S1, S2,
S3) – Remote controller wire
short
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