Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 115

Error code
Remote controller:
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
• Faulty outdoor fan motor
• Faulty outdoor main PCB
• Anomalous power supply
voltage
• Improper refrigerant amount
and refrigerant circuit
• Faulty compressor (Motor
bearing)
Note: Insulation resistance
• The unit is left for long period without power supply or soon after installation, migrated liquid refrigerant may dissolve in the refrigerant oil in the compressor.
In such case insulation resistance decreases upto several M or lower. If the electric leakage breaker is activated due to low insulation resistance,
check followings.
Check whehter the insulation resistance can recover or not, ater 6 hours has passed since power ON.
(By energize the crankcase heater, migrated liquid refrigerant in the refrigerant oil in compressor can be evaporated)
Check whether the electric leakage breake conforms to high-hermonic specifications
(As units has inverter, in order to prevent from improper operation, be sure to use high-hermonic one.)
LED Green Red
Indoor Keeps flashing Stays OFF
Outdoor – 2 times flash
5. Troubleshooting
Diagnosis
Compressor does not start at all.
Neither noise nor vibration cannot be heard
Does
compressor
startup?
NO
Is power
supply voltage
OK?
YES
Is
the pressure balance
at starting OK?
YES
Is the
insulation resistance
and coil resistance 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?
114
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Content
Compressor startup failure
Disconnect the outdoor fan motor
connector and try to startup
YES
NO
NO
NO
NO
NO
Note: Several times restarting
may resolve it, because migrated
liquid refrigerant in the
compresser is discharged from
the compressor.
NO
-
'10 • SCM-SM-094
Countermeasure
Replace outdoor fan motor
Check power supply
voltage
Check refrigerant amount
and refrigerant circuit
Repalce compressor
Defective outdoor main
PCB Replace
Defective outdoor main
PCB Replace
Repalce compressor