Daikin SkyAir Service Manual page 145

Troubleshooting Based on Equipment Condition
Troubleshooting
134
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Measure the temperature of
suction air and supply air.
Temperature difference
= Suction air temp. –
Supply air temp.
Temperature
YES
difference for cooling should
be between 8 and
18˚C.
NO
Does
any frost
generate around inlet
YES
port of indoor unit heat
exchanger or outlet port
of expansion
valve?
NO
Does
YES
indoor unit air flow rate
down?
NO
Is
the level of high YES
pressure higher than
normal level?
NO
Possible causes as follows
* Insufficient compression
of compressor
* Insufficient circulation
of refrigerant
* Faulty expansion valve
Does the
YES
heat load increase
after installation
of the unit?
NO
Possible causes as follows
* Incorrect selection of model
* Affection of direct sun
Is
the operation
current less than specified
YES
level?
NO
Gas shortage possibly
generates trouble.
* Clogged air filter
* Soiled heat exchanger
* Malfunction of fan motor
(Refer error code "A6".)
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".)
SiBE28-804
Normal.
Additional unit installation
should be considered.
After vacuum drying,
charge correct amount of
refrigerant.
Check each section.
Check each item.
Check each item.
(S1994)
Troubleshooting