Midea CSU-05HCAA Installation And Maintenance Manual page 35

VII.Troubleshooting
A.Inspection of indoor fan motor
no
is the wire connected well
connect wire
B. Inspection on the receiver circuit board
Indoor unit is able to operate when the emergency switch is pressed, but unable
to operate with remote controller.
check the model of
remote controller
is the LCD clear
yes
Take batteries out
and re-insert,
does the remote
controller work?
yes
switch on the power, press on/off button on remote controller,
(9K/12K) : measure the voltage between NO.1 and NO.2 of the connector CN100
(18K) : measure the voltage between NO.1 and NO.2 of the connector LD101T on the control board;
(24K): measure the voltage between NO.3 and NO.5 of the connector CN70 on the control board;
Trun off power, check socket CN211
yes
Pull out the wire from socket CN211 of indoor
circuit board, measure DCresistor value
between wire
Resistance is 0V (short circuit)
or (open circuit)
Replace indoor fan motor
no
Replace batteries
Turn on a radio and switch to AM,
no
press remote controller button
Is there any noise in the radio
Is there any counter-phase fast
-start fluorescent lamp within 1 meter ?
is the voltage close to 4V DC
Replace receiver
installation & Maintenance Manual
(apply only to 9K/12K)
Are the weld point all reght
- and -
yes 0 or
no
Replace remote controller
yes
Keep indoor unit far away from
yes
fluorescent lamp
Apply a filter on its receiving section
no
yes
Replace indoor electric control board
no 5V or 0V
33
yes
Re-weld
no
Replace indoor
electric board
on the control board;