Operation From The Indoor Remote Controller Is Not Accepted, And A Check Code Is Displayed On The 7-Segment Display Of The Interface P.c. Board Of The Outdoor Unit; From The Indoor Remote Controller - Toshiba MCY-MHP0305HT-C Service Manual

8-5-2. Operation from the indoor remote controller is not
accepted, and a check code is displayed on the 7-segment
display of the interface P.C. board of the outdoor unit.
Outdoor
Indoor remote
unit 7-
controller
segment
status
display
L08
E19 -00
Alternate
No response
blinking
E20 -01
Alternate
blinking
8-5-3. There is no display of a check code on the 7-segment
display on the interface P.C. board of the outdoor unit,
although there is indoor unit that is not accepting operation

from the indoor remote controller.

Outdoor
Indoor remote
unit 7-
controller
segment
status
display
No response None
No display on the
indoor remote
None
controller (no line
is output.)
Cause
Line addresses and indoor addresses of all the connected
indoor units are not set.
Indoor unit power is not turned on.
Indoor / outdoor communication line is not correctly
connected to the U1 / U2 terminal of the outdoor unit. (Indoor
/ outdoor cannot communicate before address setup.)
Address setup is performed under the condition of
connecting multiple refrigerant lines.
Cause
The communication line is not connected between indoor
and outdoor (the unit that does not respond to the indoor
remote controller).
Line address and indoor address are not set (the unit that
does not respond to the indoor remote controller).
The power of the outdoor unit of the group is not turned on in
indoor group control (the unit that does not respond to the
indoor remote controller).
Group address is set to the follower unit for individual control
(the unit that does not respond to the indoor remote
controller).
The power is not turned on (the unit that is not displayed on
the indoor remote controller).
The indoor remote controller is not connected with a wire (the
unit that is not displayed on the indoor remote controller).
Miswiring of the indoor remote controller (the unit that is not
displayed on the indoor remote controller)
Indoor remote controller communication circuit error (the unit
that is not displayed on the indoor remote controller)
If 220 V is incorrectly applied to the indoor remote controller
terminal, the remote controller communication circuit fails.
62
85
Countermeasures
Set up addresses.
Turn on the power again. (In the order:
indoor ➝ outdoor)
Correct wiring
Correct wiring
Countermeasures
Modify the wiring.
Set up the address.
Turn on the power.
Set the group address to "0" in the case of
individual control.
Turn on the power.
Modify the wiring.
Modify the wiring.
Remove the fast-on terminal connected to
indoor remote controller terminals A / B, and
check the voltage. If voltage is not applied
(normally 15 to 18 V), replace the P.C.
board.