Mitsubishi Electric PU-P71VHA 2.UK Series Service Manual page 47

Ch eck cod e Meaning of ch eck cod e and d etection meth od
Abnormal h igh pressure (High -pressure
switch 63H operated )
Abnormal if high-pressure switch 63H
operated (more than 4.14 MPa) during
compressor operation.
63H: High-pressure switch
Use current sensor to detect work or return
of 63H.
U1
(1302)
Abnormal low current or open ph ase
• An ex t reme degradation of current value
causes abnormal stop.
• Abnormal if current detected phase
(V -phase) is open phase after first com-
pressor start-up after supplying the power
by three phase power supply model.
• When compressor is operating, compres-
sor is suspended under the following
condition: and when current detector (CT)
detects a current, which is lower than the
detected current specified in the table
below, under the following condition:
<Condition>
1 For PU/ PUH-P7 1 to P100V
U1
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
. - . secon .
2 For PU/ PUH-P7 1 to P140Y
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
0.4-0.5 second.
M o d e l
P 71V
P 71Y , P 100V , P 100Y
P 125Y
P 140Y
Abnormal h igh d isch arging (compressor
surface) temperature
Abnormal if discharging (compressor
surface) temperature thermistor (TH4)
ex c e eds following temperature during com-
U2
pressor operation.
(1102)
Normal operation: 115:(P7 1-P100)/
During defrosting: 135:
Abnormal sh ortage of refrigerant
Abnormal if intake super heat ex c e eds
following temperature during heating com-
pressor operation.
U2
7 0: or more, and indoor pipe <condenser-
(1501)
evaporator> temperature (TH5) is 35: or
less.
OC37 9 J
1 Short cycle of indoor unit
2 Clogged filter of indoor unit
3 Decreased airflow caused by
dirt of indoor fan
4 Dirt of indoor heat ex c h anger
5 Locked indoor fan motor
6 Malfunction of indoor fan motor
7 Defective operation of stop
valve (Not full open)
8 Clogged or broken pipe
9 Locked outdoor fan motor
0 Malfunction of outdoor fan motor
1 Short cycle of outdoor unit
2 Dirt of outdoor heat ex c h anger
3 Disconnection or contact failure
of 63H connection
4 Defective outdoor controller
board
5 Defective action of liner ex p an-
sion valve
6 Refrigerant overcharge
1 Shortage of refrigerant
2 Abnormal pressure degrada-
tion by pump down operation
3 V -phased open phase of com-
pressor
4 Abnormal compressor
Not abnormal if V is instantly
displayed when the main
power is off.
D e t e c t e d c u r r e n t
2. 4 A
1. 0 A
1. 2 A
1. 6 A
1 Over-heated compressor
operation caused by shortage
of refrigerant
2 Defective operation of stop
valve
3 Defective thermistor
4 Defective outdoor controller
125:(P125,P140) board
or more for 3 minutes 5 Defective action of linear
continuously or 135:
ex p ansion valve
1 Leakage or shortage of refrig-
erant
2 Defective operation of stop
valve (not full open)
3 Defective thermistor (TH4,
TH5, TH6)
4 Defective outdoor controller
board
5 Defective action of electric
ex p ansion valve
Case
1– 6 Check indoor unit and repair defectives.
7 Check full open stop valve.
8 Check piping and repair defectives.
9– 2 Check indoor unit and repair defectives.
3,4 Turn the power off and check UH display
5 Check linear ex p ansion valve.
6 Replace refrigerant.
1 Check if refrigerant pressure is not degraded.
2 Check current of compressor operation when
3 Check wiring of compressor.
4 Check or replace compressor.
1 Check intake super heat.
2 Check if stop valve is full open.
34 Turn the power off and check if U3 is
5 Check linear ex p ansion valve.
1 Check leakage of refrigerant.
2 Check if stop valve is full open.
34 Turn the power off and check if U3 or U4 is
6 Check linear ex p ansion valve.
47
J ud gment and action
when the power is turned on again.
Follow the UH display if UH is displayed.
Refer to "11-6. HOW TO CHECK THE PARTS".
abnormality occurred.
Check leakage of refrigerant.
Charge refrigerant.
displayed when the power is turned on
again.
When U3 is displayed, refer to "Judgement
and action" for U3.
Refer to "11-6. HOW TO CHECK THE PARTS".
Charge refrigerant.
displayed when the power is put again.
When U3 or U4 is displayed, refer to
"Judgement and action" for U3 or U4.
Refer to "11-6. HOW TO CHECK THE PARTS".