Daikin VRV Inverter K Series - 5.8 Outdoor Unit: Inverter Over-Ripple Protection; 5.9 Defect of Radiator Fin Temperature Sensor

Troubleshooting SiE-05C
316 Troubleshooting PLUS Series
3.20 Malfunction of Transmission Between Indoor Units
Remote Controller
Display
UU
UU
44
44
Supposed Causes  Short circuited indoor or outdoor unit transmission wiring (F1, F2) or wiring mistake
 Function unit power supply OFF
 Incorrect system address
 Faulty function unit PC board
 Faulty indoor unit PC board
Trobleshooting
Was
he indoor unit
PC board or function
unit PC board unit changed,
or outdoor - outdoor unit
transmission unit
wiring modified?
All indoor
remote controllers of
same refrigerant system are
displaying "U4."
Power supply reset
The
microcomputer
normal monitor (HAP) on
the function unit PC
board is
linking.
The standby lamp (H2P)
is blinking.
Wait until the lamp goes off.
Is
indoor-outdoor and
outdoor-outdoor unit
transmission wiring
normal?
NO
NO
NO
NO
NO
YES
YES
NO
Is
indoor-outdoor
and outdoor-outdoor unit
transmission wiring
normal?
NO
NO
There is
220 V between the LN
terminals of the function
unit PC board.
The function
unit PC Board's fuse
is burnt.
Voltage on the
transformer secondary side
is approx. 22 V.
YES
YES
YES
NO
Push and hold the wiring change
button on the function unit PC
Board for 5 seconds.
∗Cannot operate for up to 12
minutes.
Indoor unit PC board replacement
Fix transmission wiring.
Supply 220 V.
Fuse replacement
Transformer replacement
Function unit PC board replacement
Fix transmission wiring.
Function unit PC board replacement
(VF154)
YES
YES
YES
YES
SI-05C.BOOK Page 316 Monday, November 6, 2000 4:13 PM
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