Troubleshooting By Indication On The Remote Controller; A0" Indoor Unit: Error Of External Protection Device - Panasonic U-4..6ML5XPQ Service Manual

Troubleshooting by Indication on the Remote Controller

3. Troubleshooting by Indication on the Remote
Controller
A0
" " Indoor Unit:
3.1
A0
Remote
Controller
Display
Applicable All indoor unit models
Models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
142
Error of External Protection Device
Actuation of external protection device
Improper field set
Defect of indoor unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
External
protection device is
connected to terminals T1
and T2 of the indoor
unit terminal
block.
NO
ON/OFF
input from
outside (mode No. 12,
first code No. 1) has been
set to external protection
device input (second
code No. 03)
by remote
controller.
NO
YES
YES
Urban Multi ML5 · Mini UM · Heat Pump
Actuation of external protection
device.
Change the second code No. to
"01" or "02" .
Indoor unit PC board replacement.
Troubleshooting
(V2776)