Daikin ERQ Service Manual page 98

Test Operation
Malfunction code
In case of an alarm code displayed on remote controller:
Malfunction
Nonconformity during installation
code
The shutoff valve of an outdoor unit is left
closed.
E3
Refrigerant overcharge.
The shutoff valve of an outdoor unit is left
closed.
E4
Insufficient refrigerant.
Refrigerant overcharge.
The shutoff valve of an outdoor unit is left
closed.
F3
Insufficient refrigerant.
F6 Refrigerant overcharge
Power supply cables are connected in the
U1
reverse phase instead of the normal phase.
U2 Insufficient supply voltage
If a check operation has not been
U3
performed.
U4 No power is supplied to an outdoor unit.
UA If no dedicated AHU is being used.
The shutoff valve of an outdoor unit is left
closed.
UF
If the right AHU piping and wiring are not
properly connected to the outdoor unit.
If the interunit wiring has not be connected
UH
or it has shorted.
88
Remedial action
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Recalculate the required amount of refrigerant from the piping
length and correct the refrigerant charge level by recovering any
excessive refrigerant with a refrigerant recovery machine.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Check if the additional refrigerant charge has been finished
correctly.
Recalculate the required amount of refrigerant from the piping
length and add an adequate amount of refrigerant.
Recalculate the required amount of refrigerant from the piping
length and correct the refrigerant charge level by recovering any
excessive refrigerant with a refrigerant recovery machine.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Check if the additional refrigerant charge has been finished
correctly.
Recalculate the required amount of refrigerant from the piping
length and add an adequate amount of refrigerant.
Recalculate the required amount of refrigerant from the piping
length and correct the refrigerant charge level by recovering any
excessive refrigerant with a refrigerant recovery machine.
Connect the power supply cables in normal phase. Change any
two of the three power supply cables (L1, L2, L3) to correct phase.
Check to see if the supply voltage is supplied properly.
Perform a check operation.
Turn the power on for the outdoor unit.
Check the AHU. If it is not a dedicated unit, replace the AHU.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Make sure that the right AHU piping and wiring are properly
connected to the outdoor unit.
Make sure the interunit wiring is correctly attached to terminals
(X2M) F1/F2 (TO IN/D UNIT) on the outdoor unit circuit board.
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ESIE09-05
Test Operation