Mitsubishi Electric PUHY-200YMF-B Service Handbook page 143

Checking code Meaning, detecting method
1 When pressue sensor detects
5201 Pressure
sensor 1kg/cm
abnormality ing operation, outdoor unit once
(outdoor unit) stops with 3 minutes restarting
mode, and restarts if the detected
pressure of pressure sensor ex-
ceeds 1kg/cm
imediately before restarting.
2 If the detected pressure of sen-
sor is less than 1kg/cm
(0.098MPa) immediately before
restarting, error stop is com-
menced displaying 5201.
3 Under 3 minutes restarting
mode, LED displays intermittent
fault check.
4 During 3 minutes after com-
pressor start, defrosting and 3
minutes after defrosting opera-
tions, trouble detection is ig-
nored.
5201 High When high or intermidiate pressure
pressure sensor
side (0.098MPa) or less immediately be-
fore starting, error stop is com-
5203 Intermedi- menced displaying "5201", or
ate "5203".
5301 IDC sensor/ • If IDC
circuit just before the inverter starts, or
abnormality • If IDC
during inverter operation after
5 seconds has passed since the
inverter started when the INV
board's SW1-1 is OFF.
1) Pressutre sensor trouble.
2 G (0.098MPa) or less dur-
2) Inner pressure drop due to a leak-
3) Broken cover.
2
G (0.098MPa) 4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty thermistor input circuit of
2 G
1) Pressure sensor trouble.
detects 1kg/cm 2 G
2) Inner pressure drop due to gas leak.
3) Broken cover.
4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty pressure sensor input circuit
20 A peak is detected 1) Contact is faulty.
10 A peak is detected
2) The current sensor (DCCT) is con-
3) An error was made in the SW1-1
4) The INV board is defective. The
Cause
age.
tion, poor contact.
MAIN board.
tion, poor contact.
of control board.
nected with reverse polarity.
setting.
current sensor (DCCT) is defective.
–141–
Checking method & Countermeasure
See Troubleshooting of pressure
sensor.
See troubleshooting of pressure
sensor.
Check the contacts of CNCT on the
INV board.
Check the DCCT polarity.
• With SW1-1 OFF, is the inverter's
output wiring open?
• With SW1-1 OFF, is a compressor
which is not specified for this model
connected to the inverter's output?
If none of the items in 1) to 3) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the INV board and the DCCT
(when replacing the circuit board, be
sure to connect all the connectors,
ground wires, etc. securely) by the fol-
lowing procedure.
1 Replace the INV board only. If it re-
covers, the INV board is defective.
2 If it does not recover, reinstall the
INV board and replace the DCCT.
If it recovers, the DCCT is defec-
tive.
If it does not recover after 1 and 2
above, both the INV board and the
DCCT are defective.