R410A All DC Inverter Mini VRF MCAC-VTSM-2014-09
76 Troubleshooting
Press the button for 5 seconds:
If the
“running” and “warning” lights are normally on, that means the address code is 9=(8
＋
1)
If the lights are blink, the address code should plus 16, so the address code is 25=16
＋
(8
＋
1)
Press the button for 10 seconds:
If the
“timer” and “warning” lights are normally on, that means the capacity code is 5=(4
＋
1) and the capacity
of indoor unit is 71×100W(2.5HP).
2. If the signal is weak, connect
a 120Ω resistor between P and Q of the farthest indoor unit, or connect a
0.5-1.5uF capacitor between P and Q of outdoor unit. Installation refers to the following picture:
Note:
Communication wires should be shield wire and indoor units should be connected in series.
7.3 E4: Pipe temperature T3& ambient temperature T4 sensor malfunction (for all models)
Case: There is no display on PCB of one system, and the problem still exists after replacing PCB. Voltage
values on measuring plate (such as 220V, 5V, 12V, etc.) are normal; after measuring resistance value of
LED
displays
E4
Whether the wire body is broken.
PCB is disabled.
Pipe temperature T3& ambient temperature T4 sensor
malfunction
Connect the wire again.
YES
NO
Judge whether temperature sensor pin connects
properly.
YES
Connect again.
NO
NO
Replace PCB.
Indoor Unit
Outdoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
R=
120Ω
Capacitor
