Midea CSU-05HCAA Installation And Maintenance Manual page 36

VII.Troubleshooting
C.inspection on indoor electric control board
indoor remoter controller doesn`t work, at the same time, the operation pilot lamp
is not lit when the emergency switch is pressed button
Carefully check the
components side
and the circuit of
electric control board
on indoor unit
D. Inspection of outdoor unit
Compressor and outdoor fan don't operate (only indoor fan operates)
press emergency switch: (at
this moment,3 minute delay
mode starts, test running
time is 30 minutes)
measure voltage between 2
and N of outdoor unit
terminals bed to see if it is
220V
measure voltage between 2
and N of indoor terminals to
see if it is 220V
replace indoor electric
control board
Replace fuse
YES
Is fuse F11 Fuse melt down
Is varistor NR11 burn out
YES
Replace varistor
start
NO
NO
installation & Maintenance Manual
NO
1.switch on the power
2.measure voltage between
TAB2 and optional pole of
protector tube for 9K/12K
/ LN of the terminal board
NO
for 18K/24K)
YES
check outdoor fan motor and compressor
check indoor and outdoor connection
YES
wires to see if they are normal
34
Fault of electric
control board
YES
Is the voltage
close to 220V
NO
Power fault