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8
REFRIGERANT SYSTEM DIAGRAM
Heat exchanger
Room temperature
thermistor (TH1)
9
TROUBLESHOOTING
9-1. TROUBLESHOOTING
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the
table below. Check the contents below before investigating details.
Note: Refer to the manual of outdoor unit for malfunction-diagnosis method by remote controller.
Unit conditions at service
The trouble is reoccurring.
The trouble is not reoccurring.
OCH753A
Condenser/evaporator
temperature thermistor
(TH5)
Pipe temperature
thermistor/liquid
(TH2)
Distributor
with strainer
#50
Check code
Judge the problem and take a corrective action according
to "9-3. SELF-DIAGNOSIS ACTION TABLE".
Displayed
Conduct troubleshooting and ascertain the cause of the
trouble according to "9-4. TROUBLESHOOTING BY INFERIOR
Not displayed
PHENOMENA".
Consider the temporary defects such as the work of protection
devices in the refrigerant circuit including compressor, poor
connection of wiring, noise, etc.Re-check the symptom, and
check the installation environment, refrigerant amount, weather
Logged
when the trouble occurred, matters related to wiring, etc.
Reset check code logs and restart the unit after finishing service.
There is no abnormality in electrical component, controller board,
remote controller, etc.
Re-check the abnormal symptom.
Conduct troubleshooting and ascertain the cause of the trou-
ble according to "9-4. TROUBLESHOOTING BY INFERIOR
PHENOMENA".
Not logged
Continue to operate unit for the time being if the cause is not
ascertained.
There is no abnormality concerning of parts such as electrical
component, controller board, remote controller, etc.
Strainer
#50
Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
Strainer
#50
Actions to be taken for service (summary)
12
Refrigerant flow in cooling
Refrigerant flow in heating
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