Troubleshooting - Daikin ERQ Service Manual

Symptom 3: Fan operation is possible, but cooling and heating do not
work.
■ Immediately after the power is turned on.
The micro computer is getting ready to operate. Wait 10
minutes.
Symptom 4: White mist comes out of a unit
Symptom 4.1: Air handling unit
■ When humidity is high during cooling operation
If the interior of an air handling unit is extremely contaminated,
the temperature distribution inside a room becomes uneven. It is
necessary to clean the interior of the air handling unit. Ask your
dealer for details on cleaning the unit. This operation requires a
qualified service person.
■
Immediately after the cooling operation stops and if the room
temperature and humidity are low.
This is because warm refrigerant gas flows back into the air
handling unit and generates steam.
Symptom 4.2: Air handling unit, outdoor unit
■
When the system is changed over to heating operation after
defrost operation
Moisture generated by defrost becomes steam and is
exhausted.
Symptom 5: The remote controller display reads "U4" or "U5" and stops,
but then restarts after a few minutes
■ This is because the remote control is intercepting noise from
electric appliances other than the air conditioner. This prevents
communication between the units, causing them to stop.
Operation automatically restarts when the noise ceases.
Symptom 6: Noise of air conditioners
Symptom 6.1: Air handling unit, outdoor unit
■
A continuous low hissing sound is heard when the system is in
cooling or defrost operation.
This is the sound of refrigerant gas flowing through both indoor
and outdoor units.
■
A hissing sound which is heard at the start or immediately after
stopping operation or defrost operation.
This is the noise of refrigerant caused by flow stop or flow
change.
Symptom 6.2: Outdoor unit
■
When the tone of operating noise changes.
This noise is caused by the change of frequency.
Symptom 7: Dust comes out of the unit
■ When the unit is used for the first time in a long time.
This is because dust has gotten into the unit.
Symptom 8: The units can give off odours
■
The unit can absorb the smell of rooms, furniture, cigarettes,
etc., and then emit it again.
Symptom 9: The outdoor unit fan does not spin.
■
During operation.
The speed of the fan is controlled in order to optimize product
operation.
Symptom 10: The display shows "
is connected)
■ This is the case immediately after the main power supply switch
is turned on and means that the remote controller is in normal
condition. This continues for one minute.
Symptom 11: The compressor in the outdoor unit does not stop after a
short heating operation
■
This is to prevent oil and refrigerant from remaining in the
compressor. The unit will stop after 5 to 10 minutes.
Operation manual
146
"
. (Only when a remote controller
Symptom 12: The inside of an outdoor unit is warm even when the unit
has stopped
■ This is because the crankcase heater is warming the
compressor so that the compressor can start smoothly.
11. T
ROUBLESHOOTING
If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells, etc.)
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire.
Contact your dealer.
The system must be repaired by a qualified service person.
■ If a safety device such as a fuse, a breaker or an earth leakage
breaker frequently actuates or the ON/OFF switch does not
properly work.
Measure: Turn off the main power switch.
■ If water leaks from the unit
Measure: Stop the operation.
■
The operation switch does not work well.
Measure: Turn off the power.
■ If the display , the unit number and the operation lamp
TEST
flash and the malfunction code appears. (Only when a remote
controller is connected) (See figure 5)
1 Inspection display
2 Air handling unit number in which a malfunction occurs
3 Operation lamp
4 Malfunction code
Measure: Notify your dealer and report the malfunction code.
If the system does not properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
1 If the system does not operate at all
■
Check if there is no power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply is recovered.
■ Check if no fuse has blown or breaker has worked. Change the
fuse or reset the breaker if necessary.
2 If the system goes into fan only operation, but as soon as it
goes into heating or cooling operation, the system stops
■ Check if air inlet or outlet of outdoor or air handling unit is not
blocked by obstacles. Remove any obstacle and make it well-
ventilated.
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ERQ100~140A7V1B + ERQ125~250A7W1B
Inverter condensing unit
4PW51322-1