Mitsubishi Electronics PCA-A.KA4 7. Test run

7. Test run

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

IR wireless remote controller

Wired remote

controller

RF thermostat Symptom Remark

Beeper sounds/OPERATION

INDICATOR lamp blinks

(Number of times)

Check code

1 E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)

For details, check the LED

display of the outdoor controller

board.

2 UP Compressor overcurrent interruption

3 U3, U4 Open/short of outdoor unit thermistors

4 UF Compressor overcurrent interruption (When compressor locked)

5 U2 Abnormal high discharging temperature/49C worked/insufﬁcient refrigerant

6 U1, Ud Abnormal high pressure (63H worked)/Overheating protection operation

7 U5 Abnormal temperature of heat sink

8 U8 Outdoor unit fan protection stop

9 U6 Compressor overcurrent interruption/Abnormal of power module

10 U7 Abnormality of super heat due to low discharge temperature

11 U9, UH Abnormality such as overvoltage or voltage shortage and abnormal

synchronous signal to main circuit/Current sensor error

12 — —

13 — —

14 Others Other errors (Refer to the technical manual for the outdoor unit.)

*1. If the beeper does not sound again after the initial 2 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 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to conﬁrm the self-check start signal was re-

ceived, 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 in the LCD.

• If the unit cannot be operated properly after test run, refer to the following table to ﬁnd the cause.

Symptom Cause

Wired remote controller LED 1, 2 (PCB in outdoor unit

PLEASE WAIT For about 2 minutes

after power-on

After LED 1, 2 are lighted, LED 2 is turned

off, then only LED 1 is lighted. (Correct

operation)

•For about 2 minutes after power-on, operation of the remote

controller is not possible due to system start-up. (Correct

operation)

PLEASE WAIT → Error code

Subsequent to about

2 minutes after

power-on

Only LED 1 is lighted. → LED 1, 2 blink.

•Connector for the outdoor unit’s protection device is not con-

nected.

Reverse or open phase wiring for the outdoor unit’s power

terminal block (L1, L2, GR)

Display messages do not appear

even when operation switch is

turned ON

(operation lamp does not light up).

Only LED 1 is lighted. → LED 1 blinks

twice, LED 2 blinks once.

•Incorrect wiring between indoor and outdoor units (incorrect

polarity of S1, S2, S3)

•Remote controller wire short

On the IR wireless remote controller with condition above, following phenomena take place.

• No signals from the remote controller are accepted.

• Operation 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)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED 1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is always lit.

LED 2 (power for remote controller) Indicates whether power is supplied to the remote controller. This LED lights only in the case of

the indoor unit which is connected to the outdoor unit refrigerant address “0”.

LED 3 (communication between indoor and outdoor units) Indicates state of communication between the indoor and outdoor units. Make sure that this LED

is always blinking.