U5" Malfunction Of Transmission Between Remote Controller And Ahu - Daikin ERQ Service Manual

Troubleshooting by Indication on the Remote Controller
U5
3.42 " " Malfunction of Transmission between Remote
Controller and AHU
U5
Remote
Controller
Display
Applicable
AII AHU models
Models
Method of In case of controlling with 2-remote controller, check the system using microcomputer is signal
Malfunction transmission between AHU and remote controller (main and sub) is normal.
Detection
Malfunction
Normal transmission does not continue for specified period.
Decision
Conditions
Supposed
Causes
Troubleshooting
214
Malfunction of AHU remote controller transmission
Connection of two main remote controllers (when using 2 remote controllers)
Defect of AHU PC board
Defect of remote controller PC board
Malfunction of transmission caused by noise
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Using
YES
2-remote controllers
control.
NO
All indoor
NO
PC board microcomputer
monitors blink.
YES
Multi-core
cableis used for the
YES
indoor unit remote controller
transmission
wiring.
NO
SS1 of
YES
both remote controllers
is set to "MAIN."
NO
Operation
NO
returns to normal when
the power is turned off
momentarily.
YES
: http://splitoff.ru/tehn-doc.html
ESIE09-05
Set one remote controller to
"SUB"; turn the power supply
off once and then back on.
Replace AHU PC board.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Switch to double-core
independent cable.
replacement
Defect of remote controller PC
board or AHU PC board.
Replace whichever is
defective.
(V2823)
Troubleshooting