Test Operation ESIE09-05
88 Test Operation
Malfunction code
In case of an alarm code displayed on remote controller:
Malfunction
code
Nonconformity during installation Remedial action
E3
The shutoff valve of an outdoor unit is left
closed.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Refrigerant overcharge.
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.
E4
The shutoff valve of an outdoor unit is left
closed.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Insufficient refrigerant.
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.
F3
Refrigerant overcharge.
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.
The shutoff valve of an outdoor unit is left
closed.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
Insufficient refrigerant.
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.
F6 Refrigerant overcharge
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.
U1
Power supply cables are connected in the
reverse phase instead of the normal phase.
Connect the power supply cables in normal phase. Change any
two of the three power supply cables (L1, L2, L3) to correct phase.
U2 Insufficient supply voltage Check to see if the supply voltage is supplied properly.
U3
If a check operation has not been
performed.
Perform a check operation.
U4 No power is supplied to an outdoor unit. Turn the power on for the outdoor unit.
UA If no dedicated AHU is being used. Check the AHU. If it is not a dedicated unit, replace the AHU.
UF
The shutoff valve of an outdoor unit is left
closed.
Open the gas-side shutoff valve and the liquid-side shutoff valve.
If the right AHU piping and wiring are not
properly connected to the outdoor unit.
Make sure that the right AHU piping and wiring are properly
connected to the outdoor unit.
UH
If the interunit wiring has not be connected
or it has shorted.
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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