Service Manual
56
Installation and Maintenance
3. Diagnosis for High Temperature, Overload Protection
(Check outdoor unit in cooling mode and check indoor unit in heating mode)
Outdoor unit malfunction indicator status
Main detection point:
●If the outdoor ambient temperature is in normal range;
●If the indoor and outdoor fan is running normally;
●If the radiating environment inside and outside the unit is well (including if the fan speed is too low)?
●If the tube temperature sensor of indoor and outdoor unit is normal?
Malfunction diagnosis process:
D5
D6
D16
D30
■
□
■
■
1. Check if fan terminal
OFAN is connected well
2. Test if the motors of
indoor and outdoor unit are
broken
If the indoor and outdoor
fan work well?
De-energize the unit
and wait for 20min
Replace the control board(replace the outdoor
control board in cooling mode, replace the
indoor control board in heating mode)
If the radiating of outdoor
and indoor unit is well?
Improve the radiating
environment of the unit
Replace
outdoor fan
End
Y
Replace fan
capacitor C1
Is the tube temp sensor normal?
Normal protection, please use it
after improving ambient temperature
of indoor and outdoor unit
If the outdoor
ambient temperature is higher than 53 ºC in
cooling mode?/if the ambient temperature of indoor
and outdoor unit is too high?
N
Y
N
Y
N
High temperature,
overload protection
check if the tube temp sensor is normal
according to the resistance sheet(check
outdoor tube temp in cooling mode, check
indoor tube temp sensor in heating mode)
Y
N
Replace the tube
temperature
sensor
