Mitsubishi Electric PUHZ-SW50VHA Service Manual Page 32
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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32
Phone Calls From Customers How to Respond Note
Check the set temperature of remote controller.
The outdoor unit cannot be operated if the set
temperature is not appropriate.
The outdoor unit operates in the following modes.
COOL: When the set temperature is lower
than the room temperature.
HEAT: When the set temperature is higher
than the room temperature.
Check if filters are not dirty and clogged. If filters
are clogged, the airflow amount will be reduced
and the unit capacity will be lowered. See the
instruction manual that came with the product for
how to clean the filters.
Check there is enough space around the air
conditioner.
If there are any obstacles in the air intake or air
outlet of indoor/outdoor units, they block the
airflow direction so that the unit capacity will be
lowered.
A gas escaping sound is heard
sometimes.
This is not a malfunction.
This is the sound which is heard when the flow of
refrigerant in the air conditioner is switched.
A cracking sound is heard
sometimes.
This is not a malfunction.
This is the sound which is heard when internal
parts of units expand or contract when the
temperature changes.
A buzzing sound is heard
sometimes.
This is not a malfunction.
This is the sound which is heard when the outdoor
unit starts operating.
A ticking sound is heard from
the outdoor unit sometimes.
This is not a malfunction.
This is the sound which is heard when the fan of
the outdoor unit is controlling the airflow amount
in order to keep the optimum operating condition.
A sound, similar to water
flowing, is heard from the unit.
This is not a malfunction.
This is the sound which is heard when the
refrigerant is flowing inside the indoor unit.
The fan speed does not match
the setting of the remote
controller in HEAT operation.
The up/down vane will be
automatically set to
horizontal blow in these
cases listed up on the left
(~). After a while, the
up/down vane will be
automatically moved
according to the setting of
the remote controller.
This is not a malfunction.
1) When the HEAT operation starts, to prevent the
unit from blowing cold air, the fan speed is
gradually increased from zero to the set speed,
in proportion to the temperature rise of the
discharged air.
2) When the room temperature reaches the set
temperature and the outdoor unit stops,
the unit starts the LOW AIR operation.
3) During the HEAT operation, the DEFROST
operation is performed to defrost the outdoor
unit. During the DEFROST operation, the
blower is stopped to prevent cold air coming
out of the indoor unit.
Sound
comes out
from the air
conditioner.
The fan speed does not match
the setting of the remote
controller during DRY
operation.(No air comes out
sometimes during DRY
operation.)
This is not a malfunction.
During the DRY operation, the blower’s ON/OFF is
controlled by the microcomputer to prevent
overcooling and to ensure efficient
dehumidification.
The fan speed cannot be set by the remote
controller during DRY operation.
Something
is wrong
with the
blower…..
The room cannot be cooled or heated sufficiently.
OCH525
- SERVICE MANUAL 1
- SAFETY PRECAUTION 2
- REFERENCE MANUAL 2
- [1] Cautions for service 3
- [3] Service tools 4
- Dimension A 5
- Dimension B 5
- 3 FEATURES 6
- 4 SPECIFICATIONS 6
- MICROPHONE 8
- 6 OUTLINES AND DIMENSIONS 9
- 7 WIRING DIAGRAM 10
- 8 WIRING SPECIFICATIONS 11
- 9 REFRIGERANT SYSTEM DIAGRAM 12
- 10 TROUBLESHOOTING 14
- 63HS) exceeds 70: 17
- •V•W phase) to 20
- SW40/50 63 61 60 58 56 53 50 23
- 10-4. TROUBLESHOOTING 24
- • Before repair 31
- Motor for compressor 34
- Linear expansion valve 34
- (LEV-A/ LEV-B) 34
- For SW40-50 34
- DC DC250~330V 35
- CC DC15V 35
- <Composition> 38
- (Voltage between pins 39
- (when stopped), DC 1– 39
- (when operated) 39
- → Transmitting signal 41
- Power consumption 43
- (SW1 on) 43
- Detailed 44
- The ones digit : Relay output 46
- SW2 setting 47
- Display detail 47
- Explanation for display 47
- Capacity Code 49
- SW50V 10 49
- Explanation for display Unit 52
- •The ones digit 53
- 11 DISASSEMBLY PROCEDURE 55
- OPERATING PROCEDURE PHOTOS 56
- Made in Japan 60
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