5. Trouble Shooting
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All rights reserved. Only training and service purposes.
Flow of trouble diagnosis
! Caution
: Before checking PCB or various outdoor unit electricity flowing parts, start the checking 3 minutes after
power cut off. If it is measured in power supply stand by state, check the tester’s measurement mode and
be careful of the short circuit with parts other than the measurement part.
Is the product
installation status OK?
Is EEV assembly
status OK?
Isn’t refrigerant
insufficient?
• Check if refrigerant is leaked
• If refrigerant is insufficient, refill refrigerant
Is each temperature
sensor normal?
• Check pipe bending or problem
• Check service valve locking
• This error occurs only in some models.
Items for
checking
Sub-items for
checking
• Action: Remove cause of the problem
• Action: Replace the sensor
• Action: Assemble / replace EEV
• Action: Take action in the leakage part and refill refrigerant
• Sensors to check: indoor temperature,
outdoor temperature, indoor pipe OUT
temperature, outdoor heat exchanger
middle temperature
• Check sensor assembly status
• Check if sensor is damaged: measure
resistance (Refer to each sensor
verification method)
• Check PCB CN - EEV1 assembly status
• Check EEV (Electronic Expansion Valve)
assembly status
6.7 Troubleshooting Outdoor Error
CH 38 (Refrigerant leakage error)
