Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 269
3.3.7 LP Drop Error
Outdoor Unit
Indication
FC
Method of
Malfunction
Detection
When the value of LP sensor was kept at lower level for a certain time range after the certain
time range passed since the compressor started.
Malfunction
Decision
Conditions
When the value of LP sensor was kept at 0kg/cm² · G or less for a certain time range after
TLPGD period
(15 seconds when cooling, 150 seconds when heating) passed since the compressor started.
Supposed
Causes
"
Malfunction of LP sensor
"
Faulty contact of LP sensor connector
"
Gas shortage
"
Heating operation under low outside air temperature beyond the operative area
Troubleshooting
Start
Check LP sensor
connectors.
Check stop valve.
Charge with the proper
amount of refrigerant.
Use as it is.
Is the gas lacking?
(MF026)
NO
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Make sure of LP sensor
connector connection.
Is it normal?
NO
Is the stop valve open?
YES
YES
NO
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