Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 166

Checking code Meaning, detecting method
1
5201 Pressure When pressue sensor detects
sensor 0.098MPa
abnormality operation, outdoor unit once
(Variable stops with 3 minutes restarting
mode, and restarts if the detected
capacity unit)
pressure of pressure sensor ex-
ceeds
before restarting.
2
If the detected pressure of sen-
sor is less than
immediately before restarting,
error stop is commenced
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.
1
5301 IAC sensor/ If IAC
circuit before the inverter starts, or
abnormality If IAC
ing inverter operation after 5
(Variable
seconds has passed since the
capacity unit)
inverter started when the INV
board's SW1-1 is OFF.
[Inverter error detail : 6]
2
If the current sensor (ACCT)
miss-wiring is detected during
inverter operation.
[Inverter error detail : 13]
Compressor-input
phase U
1)
or less during
2) Inner pressure drop due to a leak-
3) Broken cover.
0.098MPa imediately 4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty thermistor input circuit of
0.098MPa
3 Amps is detected just 1) Contact is faulty.
3 Amps is detected dur-
2) The current sensor (ACCT) is con-
3) The wiring is defective
4) The Ac current sensor (ACCT) is
5) The IPM is defective.
ACCT_U
IPM-output
phase U
Red wire
Cause
Pressure sensor trouble.
age.
tion, poor contact.
MAIN board.
nected with wrong polarity.
defective.
Compressor-input
phase W
-163-
Checking method & Countermeasure
See Troubleshooting of pressure
sensor.
Check the contacts of CNACCT on the
INV board.
Check the ACCT_U, W polarity
with below drawing.
Check 1. connections.
2. contact at the connectors.
3. for broken wires in the follow-
ing wiring.
CNDR2-CNDR1
CN15V2-CN15V1
IPM-MC1
To judgefailure of ACCT, go to "individual
Parts Failure Judgment Methods."
Check the IPM.
Judge that the IPM is fauly, (Go to "In-
dividual Parts Failure Judgment Meth-
ods.")
ACCT_W
IPM-output
phase W
Black wire