Compressor Startup Failure - Mitsubishi Heavy Industries SRK20ZSX-W Service Manual

Error code
Remote control: E59
1. Applicable model
All models
2. Error detection method
If it fails to change over to the
rotor detection operation of
compressor motor
3. Condition of error displayed
If compressor fails to startup for
42 times
4. Presumable cause
• Outdoor fan motor anomaly
• Outdoor unit main PCB
anomaly
• Anomalous power source
voltage
• Improper refrigerant amount
and refrigerant circuit
• Faulty compressor (Motor
bearing)
Note: Insulation resistance
• The unit is left for long period without power source or soon after installation, migrated liquid refrigerant may dissolve in the refrigerant oil in the compressor.
In such case insulation resistance decreases upto several MΩ or lower. If the electric leakage breaker is activated due to low insulation resistance,
check followings.
➀ Check whether the electric leakage breaker conforms to high-harmonic specifications.
(As units has inverter, in order to prevent from improper operation, be sure to use high-harmonic one.)
LED Green Red
Indoor Keeps flashing Stays OFF
– 2-time flash
Outdoor
5. Troubleshooting
Diagnosis
Compressor does not start at all.
Neither noise nor vibration cannot be heard.
Does
compressor
startup?
NO
Is power
source voltage
OK?
YES
Is
the pressure balance
at starting OK?
YES
Is the
insulation resistance and
resistance between terminals (1)
of compressor OK ?
YES
Is power transistor
module OK?
YES
Is
the output of inverter
checker OK ?
YES
Try to startup
several times
Does it start?
154
-
Content

Compressor startup failure

Disconnect the outdoor fan motor
connector and try to startup.
YES
NO
NO
NO
(1) 1.154 or more at 20°C
NO
NO
Note: Several times restarting
may resolve it, because migrated
liquid refrigerant in the
compresser is discharged from
the compressor.
NO
-
'19 • SCM-SM-276
Countermeasure
Replace outdoor fan motor.
Check power source
voltage.
Check refrigerant amount
and refrigerant circuit.
Repalce compressor.
Defective outdoor unit
PCB ➞ Replace.
Defective outdoor unit
PCB ➞ Replace.
Repalce compressor.