Daikin SkyAir RZQ200 · 250C7Y1B Service Manual page 102

SiBE26-701
Troubleshooting
*1: For operating current, refer to "Electric characteristics" (on page 9) after checking the field
Troubleshooting
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
difference for cooling
should be between 8
and 18˚C.
NO
Does
any frost generate
around inlet port of
indoor unit heat exchanger
or outlet port of
expansion
valve?
NO
Does indoor
unit air flow
rate down?
NO
Is the level
of high pressure higher
than normal
level?
NO
Possible causes as follows
∗ Insufficient compression of
compressor
∗ Insufficient circulation of
refrigerant
∗ Faulty expansion valve
system combination (indoor + outdoor).
Troubleshooting Based on Equipment Condition
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
YES
operation current
less than specified
level?∗1
NO
∗ Clogged air filter
∗ Soiled heat exchanger
YES
∗ Malfunction of fan motor
(Refer error code "A6".)
Possible causes as follows
∗ Refrigerant overcharge
∗ Air in refrigerant system
∗ Soiled heat exchanger
YES
∗ Short circuit of supply air
∗ Disturbing item in air flow
∗ Malfunction of fan motor of
outdoor unit
(Refer error code "E7", "H7".)
YES
Normal.
Additional unit installation
should be considered
YES
Gas shortage possibly
generates trouble.
Refer error code "U0"
Check refer to Check No . 8
on page 180.
Check each section
Check each item
Check each item
(S1994)
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