Mitsubishi SRK208HENF-L User Manual page 66

Anormality of thermistor
Is connection to connector
good?
Is thermistor resistance
value normal?
Replace PCB.
(4) Trouble Diagnostic Procedures
Unit malfunctions or
does not stop.
Indoor lamp of
indoor unit does not
illuminate.
Outdoor fan does not
operate.
1-66
No
Repair connector.
Yes
No
Replace thermistor.
Yes
Runaway of micro-
computer
Check receptacle voltage.
Check if PCB fuse is blown.
Check varistor.
Check transformer secondary
voltage
Replace PCB.
Check it during cooling
operation.
Check voltage with fan
connector.
(1)
Remove 52XΒ(52X6)red
wires to check operation.
(1)
Short-circuit 63H to check
operation.
(1)
Measure voltage of 52XB
(52X6) No.2 ,and terminal
block 2.
Disconnection of thermistor and defective connection of connector
(Disconnection)
(Short circuit)
Remove receptacle.
Insert it after 3 min.
and operate.
Replace fuse.
Replace varistor.
No
Replace transformer
(40 model only)
Yes
No
Operates
Replace 23DH.
Does not operate.
Operates
Replace 63H.
Does not operate.
No
Replace 52XB(52X6).
Chart for thermistor temperature
resistance characteristics
(kΩ)
Temperature (°C)
No change.
Normal operation.
Abnormal
Check capacitor.
Normal
Replace fan motor.
Notes (1) It is not necessary to inspect
Replace PCB.
Microcomputer rarely
mis-starts even during
times or power supply
or power failure, but, it
can sometimes occur
during those times. If it
occurs, check the opera-
tion, when the result is
positive then proceed as
normal.
Replace capacitor.
the dedicated cooling unit.
(2) Value in ( ) indicates
40models