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Si21-205
Troubleshooting Based on Equipment Condition
Troubleshooting
127
1.6
Equipment operates but does not provide heating.
Applicable Model
All models of SkyAir series
Error Detection
Method
Error Generating
Condition
Possible Cause
Excess charge of refrigerant
Air intrudes into refrigerant system
Faulty magnetic switch for outdoor unit fan motor
Faulty aux. relay for outdoor unit fan motor
Soiled heat exchanger of outdoor unit
There is an interfering item in air flow of outdoor unit
Malfunction of outdoor unit fan
Soiled air filter of indoor unit
Soiled heat exchanger of indoor unit
There is some interfering item in airflow of indoor unit
Malfunction of indoor unit fan
Troubleshooting
Measure the temperature of
suction air and supply air.
Temperature difference =
Supply air temp. – Suction air
temp.
Wait for a while.
No abnormality
No abnormality
Additional unit installation
should be considered
After vacuum drying, charge
correct amount of refrigerant.
Check each item
Check each item
Check each item
Temperature
difference for heating
should be between 16
and 23˚C.
Is the unit
in defrost mode?
Is the operation
current less than specified
level?
Does the
heat load increase after
installation of the
unit?
YES
YES
YES
YES
YES
YES
∗
Incorrect selection of model
∗
Affection of sunlight
∗
Affection of excessive fresh
air into room
Gas shortage possibly
generates trouble.
∗
Clogged air filter
∗
Soiled heat exchanger
∗
Malfunction of indoor fan
motor (Refer error code “A6”
FHQ only)
∗
Refrigerant shortage of
outdoor unit
∗
Soiled heat exchanger
∗
Short circuit of discharge air
∗
Disturbing item in air flow
∗
Malfunction of fan motor of
outdoor unit
(Refer error code “E7”, “H7”)
∗
Insufficient compression of
compressor
∗
Insufficient circulation of
refrigerant
∗
Faulty expansion valve
NO
NO
NO
Does indoor
unit air flow
rate down?
NO
Is the level
of high pressure lower
than normal level?
NO
NO
(S2730)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...