Mitsubishi Electric PURY-80TMU Service Handbook page 98

Checking code Meaning, detecting method
1 When pressue sensor detects
5201 Pressure
sensor 0.098MPa (14.22psi) or less dur-
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 0.098MPa (14.22psi)
imediately before restarting.
2 If the detected pressure of sen-
sor is less than 0.098MPa
(14.22psi) 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 detects 0.098MPa (14.2psi)
side or less immediately before starting,
error stop is commenced display-
5203 Intermedi- ing "5201", or "5203".
ate
5301 IDC sensor/ • If IDC
circuit trouble before the inverter starts, or
• If IDC
ing 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) Inner pressure drop due to a leak-
age.
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire.
6) Faulty thermistor input circuit of
MAIN board.
1) Pressure sensor trouble.
2) Inner pressure drop due to gas leak.
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire.
6) Faulty pressure sensor input circuit
of control board.
20 A is detected just 1) Contact is faulty.
10 A is detected dur-
2) The current sensor (DCCT) is con-
nected with reverse polarity.
3) An error was made in the SW1-1
setting.
4) The INV board is defective. The
current sensor (DCCT) is defective.
–97–
Cause 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 con-
nectors, ground wires, etc. securely) by
the following procedure.
1 Replace the INV board only. If it
recovers, the INV board is defec-
tive.
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.