Si-71A Troubleshooting Based on Equipment Condition
Troubleshooting 87
3.7 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 pressure switch
„
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
discharge air.
Temperature difference =
Suction air temp. –
Discharge 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
14 and 30 ˚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
Gas shortage possibly
generates trouble.
* Clogged air filter
* Soiled heat exchanger
* Malfunction of fan motor
* Refrigerant overcharge
* Soiled heat exchanger
* Short circuit of discharge air
* Disturbing item in air flow
* Malfunction of fan motor of
outdoor unit
* Insufficient compression of
compressor
* Insufficient circulation of
refrigerant
* Faulty expansion valve
NO
NO
NO
Does indoor
unit discharge air flow
rate down?
NO
Is the level
of high pressure lower
than normal level?
NO
NO
(SF036)
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