Daikin VRV III REYQ8PY1 Service Manual page 175

Test Operation
[Remote controller displays malfunction code]
REYQ8~16PY1
Malfunction code
REYQ18~48PY1
Malfunction code
U7, U4, UF, UH
Note:
If any malfunction codes other than the above are displayed, check the service manual for how
to respond.
164
E3, E4
The shutoff valve of the outdoor unit is
F3, F6
left closed.
UF
The phases of the power to the outdoor
U1
unit is reversed.
U1 No power is supplied to an outdoor, BS
U4 or indoor unit (including phase
LC interruption).
There is conflict on the connection of
UF
transmission wiring in the system.
E3
F6 Refrigerant overcharge.
UF
E4
Insufficient refrigerant.
F3
Field wiring is connected to "TO MULTI
U7, U4 UNIT (Q1,Q2)" terminal on the outdoor
UF, UH unit PC board (A1P) when the system
is one outdoor system.
The internal transmission wiring to "TO
UA MULTI UNIT (Q1,Q2)" for the single
outdoor unit system are disconnected.
E3, E4, F3, F6 The shutoff valve of the outdoor unit is
UF left closed.
The phases of the power to the outdoor
U1
unit is reversed.
No power is supplied to an outdoor, BS
U1, U4, LC or indoor unit (including phase
interruption).
There is conflict on the connection of
UF
transmission wiring in the system.
E3, F6, UF Refrigerant overcharge.
E4, F3 Insufficient refrigerant.
Field wiring is connected to "TO MULTI
UNIT (Q1,Q2)" terminal on the outdoor
unit PC board (A1P) when the system
is one outdoor system.
Installation error
Installation error
Remedial action
Open the shutoff valve.
Exchange two of the three phases (L1,
L2, L3) to make a proper connection.
Make sure the power source wire is
properly connected to the outdoor, BS or
indoor unit and revise if necessary.
Check if the refrigerant piping line and the
transmission wiring are consistent with
each other.
Recalculate the additional amount
refrigerant from the piping length and
correct the refrigerant charge level by
recovering any excessive refrigerant with
a refrigerant recovery machine.
• Check if the additional refrigerant
charge has been finished correctly.
• Recalculate the additional amount
refrigerant from the piping length and
add the adequate amount.
Remove the line from the "TO MULTI
UNIT (Q1, Q2)" terminal.
Connect the internal transmission wiring
to "TO MULTI UNIT (Q1,Q2)". (See the
wiring diagram.)
Remedial action
Open the shutoff valve.
Exchange two of the three phases (L1,
L2, L3) to make a proper connection.
Make sure the power source wire is
properly connected to the outdoor, BS or
indoor unit and revise if necessary.
Check if the refrigerant piping line and the
transmission wiring are consistent with
each other.
Recalculate the additional amount
refrigerant from the piping length and
correct the refrigerant charge level by
recovering any excessive refrigerant with
a refrigerant recovery machine.
• Check if the additional refrigerant
charge has been finished correctly.
• Recalculate the additional amount
refrigerant from the piping length and
add the adequate amount.
Remove the line from the "TO MULTI
UNIT (Q1, Q2)" terminal.
Test Operation
Si37-701