Daikin VRV Inverter K Series Manual page 330

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