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 Header Unit
Indoor
remote controller
status
No response
Header unit
7-segment
display
L08
E19
Ù
-00
Alternate
blinking
E19
Ù
-02
Alternate
blinking
E20
Ù
-01
Alternate
blinking
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 . (Indoor/outdoor
cannot communicate before address setup.)
There is no of outdoor terminal resistance,
or there are two or more resistances
(before address setup).
When connecting an indoor/outdoor communication line
between outdoor units under the condition of a connected
communication line between outdoor units.
SW08 setup error
Address setup is performed with connecting an indoor/
outdoor communication line between outdoor units.
Address setup is performed under the condition of
connecting multiple refrigerant lines.
Countermeasures
Set up addresses.
Set up a group address.
Turn on the power again.
(In the order: indoor
→
outdoor)
Correct wiring
Check SW30 bit 2 of the header unit.
No connection between multiple
refrigerant lines: SW30 bit 2 is on.
Connection between multiple refrigerant
lines: SW30 bit 2 of the connected header
unit is turned on only for one line.
Correct wiring
Turn all SW08 switches to “off.”
Correct wiring
Correct wiring
There is no Display of a Check Code on the 7-Segment Display on the Interface P.C.
Board of the Header Unit, Although there is Indoor Unit that is not Accepting
Operation from the Indoor Remote Controller
Indoor
remote controller
status
No response
No display
on the indoor
remote controller
(no line is output.)
Header unit
7-segment
display
None
None
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
18V), replace the PC board.
ON
SW30
1
2
20
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 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.
Summary of Contents for MMY-MAP0804 Series
Page 1: ...Quick reference R410A FILE NO A11 005 ...
Page 49: ...MEMO ...
Page 50: ...MEMO ...
Page 51: ...MEMO ...
Page 52: ......
