Mitsubishi Electric MVZ Series Service Manual page 27

12-2. SELF-CHECK FUNCTION
• Refer to the installation manual that comes with each remote controller for details.
• RF thermostat is not established.
[Output pattern A] Errors detected by indoor unit
Wired remote controller
IR wireless remote controller
RF thermostat
Beeper sounds/OPERATION
INDICATOR lamp flashes Check code
(Number of times)
1 P1
2
P2, P9
3 E6, E7
4 P4
5 P5
6 P6
7
EE
8 P8
9
E4
10 –
11
–
12 Fb
No sound – –
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wired remote controller
IR wireless remote controller
RF thermostat
Beeper sounds/OPERATION
INDICATOR lamp flashes Check code
(Number of times)
1 E9
2
UP
3 U3, U4
4 UF
5 U2
6 U1, Ud
7 U5
8 U8
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
For about 2 minutes
PLEASE WAIT
following power-on
PLEASE WAIT → Error code
After about 2 min-
utes has expired
Display messages do not appear
following power-on
even when operation switch is
turned ON (operation 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.
• The buzzer makes a short ping sound.
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
Intake sensor error
Pipe (Liquid or 2-phase pipe) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating safeguard operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
No corresponding
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/ insufficient refrigerant
Abnormal high pressure (63H worked)/ Overheating safeguard operation
Abnormal temperature of heat sink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality 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 outdoor 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.
25
Symptom
Symptom
• 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
Remark
Remark
For details, check the LED
display of the outdoor controller
board.
Cause