Equipment Operates But Does Not Provide Heating - Daikin Skyair FHC35K Service Manual

Si-71A
3.7

Equipment Operates but does not Provide Heating.

Applicable Model
All models of Skyair series
Error Detection
Method
Error Generating
Condition
„ Excess charge of refrigerant
Possible Cause
„ 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
Troubleshooting
Is the unit
in defrost mode?
NO
Measure the temperature
of suction air and
discharge air.
Temperature difference =
Suction air temp. –
Discharge air temp.
Temperature
difference for heating YES
should be between
14 and 30 ˚C.
NO
Is the
YES
operation current less
than specified
level?
NO
Does indoor
YES
unit discharge air flow
rate down?
NO
Is the level
YES
of high pressure lower
than normal level?
NO
* Insufficient compression of
compressor
* Insufficient circulation of
refrigerant
* Faulty expansion valve
Troubleshooting Based on Equipment Condition
YES
Does the
YES
heat load increase
after installation
of the unit?
NO
* 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
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
(SF036)
87