52
Installation and Maintenance
Service Manual
9. Maintenance
4. High discharge temperature protection of compressor (E4)
Start
Abnormal system (blockage)
Check the system;
eliminate the
blockage
Problem is
solved
Problem is
solved
Problem is
solved
Problem is
solved
Check wiring and
fan capacitor,
replace motor
Check the unit to
let the air come in
and come out
smoothly
Replace tempera-
ture sensor
Motor speed of
outdoor unit is abnoral
(under cooling mode)
Abnormal air in for
outdoor unit (under cooling
mode)
Normal syste, but resistance
value of discharge temperature sensor
for compressor is abnormal
Replace control
panel
End
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
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