Mitsubishi PKH-1.6GKLH Technical & Service Manual page 47

4. TROUBLESHOOTING ACCORDING TO CHECK CODE
Blinking
Diagnosis of malfunction
LED
LD1 Reversed phase
Open phase
LD2
Outdoor coil thermistor is
LD
abnormal. (Open circuit or short
circuit)
LD High pressure switch (6H2)
function
Thermal relay (1C) function
LD
Thermal switch (26C) function.
LD6
LD7 Over heat protection
LD8 Input circuit of outdoor controller
board is abnormal.
5. WHEN OUTDOOR UNIT DOES NOT WORK
1) Indoor/outdoor connecting wires are poorly connected.
(Refer to next page.)
2) Power supply is poorly connected.
) Connector or transformer is broken.
) Fuse (6.A) in the outdoor controller board is blown.
OC229A
Phases L , L
1
nected improperly.
● Phase L
2
● Contact of protector, such as
thermal switch, opened when
power was turned on.
● Outdoor coil thermistor is bro-
ken.
● Thermistor was connected
incorrectly.
● 62H2 was badly connected.
● 63H2 was working.
● 1C was connected incorrectly.
● 51C was working.
● 26C was connected incorrectly.
● 26C is working.
● The thermistor is broken.
● Coil temperature is over 67°C.
● Pulse input is abnormal.
Cause
Cause
, and L are con- Check the power supply connection.
2 
● Check the power supply.
is open.
● Check each protector.
● Measure the resistance of the thermistor.
● Check the thermistor. If normal, replace the out-
door controller board.
● Check 63H2 and the outdoor fan motor.
● Check if refrigerant supply is low.
● Check if air cycle is short-cycled.
● Check 51C, the compressor, and power supply.
● Check 26C.
● Check if refrigerant supply is low.
● Check if the capillary tube is clogged.
● Measure the resistance of the thermistor.
● Check the outdoor fan motor.
● Check if air cycle is short-cycled.
● Replace the outdoor controller board.
1) Check the connecting wires.
2) Check the power supply.
) Check connectors and transformers.
) Check the fuse.
7 7
Check point
Check points