MXS Service Manual

SiUS121736EA Troubleshooting for Outdoor Unit
Service Diagnosis 196
7.13 High Pressure Control in Cooling
Error Code F6
Outdoor Unit LED
Display
A j 1 i 2 h 3 i 4 i 5 h
Method of Error
Detection
High pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the
temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.
Error Decision
Conditions
 The temperature sensed by the outdoor heat exchanger thermistor rises above about 65°C
(149°F).
 The error is cleared when the temperature drops below about
49.5°C (121.1°F).
Supposed
Causes
 The installation space not large enough
 Dirty outdoor heat exchanger
 Defective outdoor fan motor
 Defective stop valve
 Defective electronic expansion valve or coil
 Defective outdoor heat exchanger thermistor
 Defective outdoor unit PCB
Troubleshooting
Check No.01
Refer to P.209
Check No.12
Refer to P.212
Check No.17
Refer to P.216
Check No.18
Refer to P.216
Check No.19
Refer to P.217
(R20418)
Caution
Replace the outdoor fan
motor.
Reconnect the connector or
fan motor lead wires.
Replace the stop valve.
Replace the outdoor heat
exchanger thermistor.
Replace the outdoor unit
PCB (main PCB).
Replace the electronic
expansion valve or the coil.
Replace the outdoor unit
PCB (main PCB).
Change the installation
location or direction.
Clean the outdoor heat
exchanger.
Check the installation space.
NG
OK
OK
NG
NG
OK
OK
OK
NG
NG
Check No. 19
Check the outdoor fan.
Check No. 18
Check the discharge
pressure.
Check No. 12
Check the electronic
expansion valve.
Check No. 01
Check the outdoor heat
exchanger thermistor.
Check No. 17
Check the installation
condition.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.