How To Handle Request For Maintenance; General Troubleshooting Flowchart - Daikin SkyAir Service Manual

SiBE28-804

1. How to Handle Request for Maintenance

1.1

General Troubleshooting Flowchart

Find out the situation according to the following procedure when there is a request for service
from the customer.
Wait until
power failure
is over.
Is there a
Doesn't run at all
power
failure?
The fan comes on
but the
compressor
doesn't run.
Cooling starts but
stops right away.
The unit won't run
again for a while
after stopping.
The unit runs but
doesn't cool the
room.
The units runs but
doesn't heat the
room.
Troubleshooting
Turn the power supply
switch ON or replace
the fuse.
YES
YES
The power supply switch is
NO
OFF or the switch's fuse is
burnt.
Nomal
Runs
Set the remote
Doesn't run
controller's temperature
setting to:
(1)When
cooling:Minimum
(2)When
heating:Maximum
Ask for the character
code of the malfunction
code.
YES
Units equipped with liquid
crystal remote controllers only
Is the remote
controller's operation
NO
lamp blinking?
Units equipped with wireless
remote controllers only
Is the operation lamp of
the indoor unit's signal
receiving section
blinking?
Did you allow 3 minutes to
Try turning the elapse after turning ON?
Operation switch OFF
and On.
Measure the suction
/disharge temperature.
(Temperature differential
=suction temperature - discharge temperature)
Measure the suction
/discharge temperature.
(Temperature differential
=discharge temperature - suction temperature)

How to Handle Request for Maintenance

Troubleshooting by remote
controller malfunction
code.
YES
Units equipped with liquid
crystal remote controllers only
Is the remote
controller's operation
NO
lamp blinking?
Units equipped with wireless
remote controllers only
Is the operation lamp of the
indoor unit's signal receiving
section blinking?
Troubleshooting by remote
controller malfunction
code.
YES
Units equipped with liquid
crystal remote controllers only
Is the remote controller's
operation lamp blinking?
Machines equipped with
wireless remote controllers only.
Units equipped with wireless
remote controller only.
Is the operation lamp of the
indoor unit's signal receiving
section blinking?
Cooling
Heating
Nomal
YES
NO
Runs
Operation is
normal.
Is there something causing the
indoor load to be large, such as
an open window or door?
YES
NO
Temperature
differential is 8~18˚C
Operation is
normal.
Is there something causing the
indoor heat load to be large, such
as an open window or door?
YES
NO
Temperature
differential is 14~30˚C
Refer to "Remote controller display
malfunction code and contents".
(1) The operation circuit fuse is
disconnected or is making poor contact.
(2) The operation swich is broken or its
contact is defective.
(3) The high pressure switch is broken.
NO
(4) The fan motor's magnetic switch is
broken.
(5) The fan motor's overcurrent relay is
being actuated or is broken.
(6) The compressor's overcurrent relay is
broken.
(7) The compressor's protective thermostat
is broken.
(8) The electrical system insulation is
defective.
(9) The compressor's magnetic switch's
contact is defective.
(10) The compressor is broken.
(11) Thermostat is broken.
NO
(12) The cool/heat selector is broken.
(13) The operation switch is broken.
(14) The compressor's magnetic swich is
broken.
(15) Over-charged with refrigerant.
(16) Air is mixed inside the refrigerant
circuit.
(17) The pressure switch is broken.
(18) The outdoor unit fan motor's magnetic
switch is broken.
(19) The outdoor unit fan motor's auxiliary
relay is broken.
(20) The outdoor unit's heat exchanger is
dirty.
(21) There is something blocking the
outdoor unit's air flow.
(22) Malfunction of the outdoor unit's fan.
(23) The indoor unit's air filter is dirty.
(24) The indoor unit's heat exhanger is
dirty.
(25) There is something blocking the indoor
unit's air flow.
(26) Malfunction of the indoor unit's fan.
(27) Overcurrent relay (for compressor)
(28) Compressor's protective themostat
(29) The causes for the overcurrent relay
(for compressor) being actuated are:
(29)-1 Power supply voltage is lower than
prescribed.
(29)-2 High pressure is too high.
(29)-3 The power supply cord is too small.
(29)-4 The compressor is broken.
(30) The causes for the compressor's
protective thermostat
(30)-1 Internal leak of the-4way valve
(No substantial difference between
suction and discharge temperature.
(30)-2 Unsatisfactory compression from
the compressor
(30)-3 Different kind of refrigerant is charged.
(30)-4 Malfunction of the expansion valve
(30)-5 Unsatisfactory refrigerant circulation
OK.We'll be right over.
(Service work required)
(S1989)
123