Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 122

Checking code Meaning, detecting method
When pressue sensor detects
5201 Pressure 1.
0.098MPa or less during oper-
sensor
ation, heat source unit once
abnormality
stops with 3 minutes restarting
(heat source
mode, and restarts if the de-
unit)
tected pressure of pressure
sensor exceeds 0.098MPa im-
ediately before restarting.
2. If the detected pressure of sen-
sor is less than 0.098MPa im-
mediately before restarting, er-
ror 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.
5301 IAC sensor/ 1 If IAC
circuit before the inverter starts, or
abnormality If IAC
ing inverter operation after 5
seconds has passed since the
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) Pressure sensor troub le.
2) Inner pressure drop due to a leak-
3) Broken cover.
4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty thermistor input circuit of
3 Arms is detected just 1) Contact is faulty.
3 Arms 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
age.
tion, poor contact.
MAIN board.
nected with wrong polarity.
defective.
Compressor-input
phase W
–121–
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