No Remote Controller Response With Check Code; No Remote Controller Response Without Check Code - Toshiba MMY-MUP0721HT9P-UL Service Manual

7-5-2. No Remote Controller Response with Check Code

(Operation from the indoor remote controller is not accepted, and a check code is displayed on the 7-
segment display of the interface PC board of the header unit)
Indoor remote Header unit
controller 7-segment
status display
L08
E19 -00
Alternate
blinking
No response
E19 -02
Alternate
blinking
E20 -01
Alternate
blinking

7-5-3. No Remote Controller Response without Check Code

(There is no display of a check code on the 7-segment display on the interface PC board of the header unit,
although there is indoor unit that is not accepting operation from the indoor remote controller)
Indoor remote Header unit
controller 7-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.
There is no header unit of group control.
Indoor unit power is not turned on.
Indoor/outdoor communication line is not correctly connected
to the U1/U2 terminal of the header unit ( Fig. 1). (Indoor/
outdoor cannot communicate before address setup.)
When the terminator resistor (SW100 bit2) in the
communication line between indoor and outdoor
units (Uv) on the outdoor unit has not been turned
on or two or more terminator resistors have been
turned on (After address setup, when terminator
resistor setup is changed after powering-on)
When connecting an indoor/outdoor communication line
between outdoor units under the condition of a connected
communication line between outdoor units ( Fig. 2).
SW08 setup trouble
Address setup is performed with connecting an indoor/
outdoor communication line between outdoor units ( Fig. 3).
Address setup is performed under the condition of
connecting multiple refrigerant lines ( Fig. 3).
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 header 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 trouble (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.
Set up addresses.
Set up a group address.
Turn on the power again. (In the order:
indoor
Correct wiring
Check SW100 bit 1 or bit 2 of the header unit.
ON
1 2 No connection between multiple refrigerant
lines: Turn off SW100 bit 1 and turn on bit 2.
Connection between multiple refrigerant
SW100
lines: Turn on SW100 bit 1 of only the
connected header unit for one line.
Turn on SW100 bit2 of all the header units.
* Factory default : SW100 bit 1 is off, bit 2
Correct wiring
Turn all SW08 switches to "off."
Correct wiring
Correct wiring
Improve 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.
Improve the wiring.
Improve the wiring.
Remove the quick connect 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 PC board.
- 135 -
Countermeasures
outdoor)
is off.
Countermeasures