Mitsubishi Electric PAAA18AA1 Installation Manual page 100

[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.
Symptom
Wired remote controller
PLEASE WAIT For about 2 mi-
nutes following
power-on
PLEASE WAIT →
Error code
After about 2 mi-
nutes has ex-
Display messag-
pired following
es do not appear
power-on
even when oper-
ation switch is
turned ON (oper-
ation lamp does
not light up).
© 2022 Mitsubishi Electric US, Inc.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Symptom
LED 1, 2 (PCB in
outdoor unit)
After LED 1, 2 are
lighted, LED 2 is
turned off, then on-
ly LED 1 is lighted.
(Correct operation)
Only LED 1 is ligh-
ted. → LED 1, 2
blink.
Only LED 1 is ligh-
ted. → LED 1, 2
blinks twice, LED 2
blinks once.
100
Cause
– For about 2 minutes after
power-on, operation of the re-
mote 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 in-
door and outdoor units (incor-
rect polarity of S1, S2, S3) –
Remote controller wire short
Specifications are subject to change without notice.