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Troubleshooting Based on Equipment Condition
Si21-205
126
Troubleshooting
Troubleshooting
Measure the temperature of
suction air and supply air.
Temperature difference =
Suction air temp. – Supply air
temp.
Possible causes as follows
∗
Incorrect selection of model
∗
Affection of direct sun
∗
Clogged air filter
∗
Soiled heat exchanger
∗
Malfunction of fan motor
(Refer error code “A6”. only
for FHQ)
Possible causes as follows
∗
Refrigerant overcharge
∗
Air in refrigerant system
∗
Soiled heat exchanger
∗
Short circuit of supply air
∗
Disturbing item in air flow
∗
Malfunction of fan motor of
outdoor unit
(Refer error code “E7”, “H7”.)
Possible causes as follows
∗
Insufficient compression of
compressor
∗
Insufficient circulation of
refrigerant
∗
Faulty expansion valve
Gas shortage possibly
generates trouble.
Normal.
Additional unit installation
should be considered
After vacuum drying, charge
correct amount of refrigerant.
Check each section
Check each item
Check each item
Temperature
difference for cooling
should be between 8
and 18˚C.
Does
any frost generate
around inlet port of
indoor unit heat exchanger
or outlet port of
expansion
valve?
Is the
operation current
less than specified
level?
Does indoor
unit air flow
rate down?
Is the level
of high pressure higher
than normal
level?
Does the
heat load increase after
installation of the
unit?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
(S1994)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Measure the temperature of
suction air and supply air.
Temperature difference =
Suction air temp. – Supply air
temp.
Possible causes as follows
∗
Incorrect selection of model
∗
Affection of direct sun
∗
Clogged air filter
∗
Soiled heat exchanger
∗
Malfunction of fan motor
(Refer error code “A6”. only
for FHQ)
Possible causes as follows
∗
Refrigerant overcharge
∗
Air in refrigerant system
∗
Soiled heat exchanger
∗
Short circuit of supply air
∗
Disturbing item in air flow
∗
Malfunction of fan motor of
outdoor unit
(Refer error code “E7”, “H7”.)
Possible causes as follows
∗
Insufficient compression of
compressor
∗
Insufficient circulation of
refrigerant
∗
Faulty expansion valve
Gas shortage possibly
generates trouble.
Normal.
Additional unit installation
should be considered
After vacuum drying, charge
correct amount of refrigerant.
Check each section
Check each item
Check each item
Temperature
difference for cooling
should be between 8
and 18˚C.
Does
any frost generate
around inlet port of
indoor unit heat exchanger
or outlet port of
expansion
valve?
Is the
operation current
less than specified
level?
Does indoor
unit air flow
rate down?
Is the level
of high pressure higher
than normal
level?
Does the
heat load increase after
installation of the
unit?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
(S1994)
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 ...