Mitsubishi Electric Mr. Slim PLA Series, Руководство по обслуживанию

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TCH070A
26 27
Check code Abnormal point and detection method Cause Countermeasure
P5
Drain overflow protection operation
1
Suspensive abnormality, if drain float
switch is detected to be underwater for 1
minute and 30 seconds continuously with
drain pump on.
Compressor and indoor fan will be turned
off.
2
Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
3
Constantly detected during drain pump
operation
Drain pump lock protection operation
1
Error postponement, if drain pump stops
for 5 seconds continuously while drain
pump is operating.
2
Drain pump is abnormal if above condi-
tion is repeated 4 times after error post-
ponement is detected.
1
Malfunction of drain pump
2
Defective drain
Clogged drain pump
Clogged drain pipe
3
Defective drain float switch
Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)
4
Defective indoor-controller
board
1
Malfunction of drain pump
2
Clogged drain pump
3
Contact failure of connector
4
Defective indoor controller
board
1
Check if drain-up machine works.
2
Check drain function.
3
Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN
with the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
4
Replace indoor controller board if it is short-circuit-
ed between
3
–
4
of the drain float switch connec-
tor CN4F and abnormality reappears.
It is not abnormal if there is no problem
about the above-mentioned
1
–
4
.
Turn the power off, and on again to operate
after check.
1
Check if drain pump works.
2
Check if drain pump works.
3
Check contact failure of connector CNP
4
Press the indoor emergency switch
(SWE) to check the voltage between
CNP
1
-
3
.
• If 13 V DC, replace the drain pump.
• If not 13 V DC, replace the indoor con-
troller board.
P6
Freezing/overheating protection is work-
ing
1
Freezing protection (Cooling mode)
• In case when
outside temperature > −4°F [−20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−5°F [−15
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −5°F [−15
:
]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
• In case when
outside temperature
[
−4°F [−20
:
]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−31°F [−35
:
] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −31°F [−35
:
]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
2
Overheating protection (Heating mode)
The unit is in 6-minute resume
prevention mode if pipe <liquid or con-
denser/evaporator> temperature is
detected as over 158°F [70
:
] after the
compressor started. Abnormal if the tem-
perature of over 158°F [70
:
] is detected
again within 30 minutes after 6-minute
resume prevention mode.
(Cooling or drying mode)
1
Clogged filter (reduced airflow)
2
Short cycle of air path
3
Low-load (low temperature)
operation out of the tolerance
range
4
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5
Defective outdoor fan control
6
Overcharge of refrigerant
7
Defective refrigerant circuit
(clogs)
(Heating mode)
1
Clogged filter (reduced airflow)
2
Short cycle of air path
3
Overload (high temperature)
operation out of the tolerance
range
4
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5
Defective outdoor fan control
6
Overcharge of refrigerant
7
Defective refrigerant circuit
(clogs)
8
Bypass circuit of outdoor unit is
defective.
(Cooling or drying mode)
1
Check clogs of the filter.
2
Remove shields.
4
Refer to "9-6. HOW TO CHECK THE
PARTS".
5
Check outdoor fan motor.
67
Check operating condition of refriger-
ant circuit.
(Heating mode)
1
Check clogs of the filter.
2
Remove shields.
4
Refer to "9-6. HOW TO CHECK THE
PARTS".
5
Check outdoor fan motor.
6
–
8
Check operating condition of refriger-
ant circuit.
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