Mitsubishi Electric TRANE NTXAMT12A112AA Service Manual page 42

IR wireless re- Wired remote
mote controller controller
RF thermostat
Beeper sounds/ Check code
OPERATION
INDICATOR lamp
flashes
(Number of
times)
9 U6
10 U7
11 U9, UH
12 –
13 –
14 Others
*1 If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was
received and the OPERATION INDICATOR lamp does not come on, there are no error records.
*2 If the beeper sounds three times continuously "beep, beep, beep (0.4 + 0.4 + 0.4 sec.)" after the initial
two beeps to confirm the self-check start signal was received, the specified refrigerant address is incorrect.
• On IR wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• 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 → Error code
After about 2 minutes
has expired
Display messages do not ap-
following power-on
pear even when operation
switch is turned ON (opera-
tion lamp does not light up).
On the IR wireless remote controller with conditions above, following phenomena takes place.
• No signals from the remote controller are accepted.
• OPE lamp is blinking.
Specifications are subject to change without notice.
NTXAMT12, 18, 24, 30, 36A112AA
Symptom
Compressor overcurrent interruption/Abnormal of power
module
Abnormality of super heat due to low discharge tempera-
ture
Abnormalities such as overvoltage or voltage shortage
and abnormal synchronous signal to main circuit/Current
sensor error
–
–
Other errors (Refer to the technical manual for the out-
door unit.)
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.
42
Remark
Cause
• For about 2 minutes after power-on, operation of the remote
controller is not possible due to system start-up. (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
© 2022 Mitsubishi Electric Trane HVAC US LLC. All rights reserved.