SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
421 08 9204 00
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(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
D5
D6
D16
D30
Detection:
If the outdoor ambient temperature is in normal range;
If the indoor and outdoor fan are running normally;
If the heat transfer environment inside and outside the
unit is good (including if the fan speed is too low)?
If the tube temperature sensor of indoor and outdoor
unit is normal?
Malfunction diagnosis process:
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 heat transfer of outdoor
and indoor unit is good?
Improve the heat transfer
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 127 ºF 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