46 SERVICE MANUAL FOR AMERICA
12. TROUBLESHOOTING
WARNING!!!
When Power Up – the whole outdoor unit controller, including the wiring, is under HIGH
VOLTAGE!!!
Never open the Outdoor unit before turning off the Power!!!
When turned off, the system is still charged (400V)!!!
It takes about 3 Min. to discharge the system.
Touching the controller before discharging may cause an electrical shock!!!
For safe handling of the controller please refer to section 1.6 below.
1.1 Air Conditioner Failures and Corrective Actions
F1
：
1
，
Communicate wire cut off ,loose or wrong wiring---check wires
2，
Communication interfere---check wires connection with circuit diagram.(earth line must be wired)
。
F2
：
1
，Temp. sensor of indoor room short or cut off.---change sensor
F3：
1，
Temp. sensor of indoor coil pipe outlet short or cut off.---change sensor.
2，
Temp. sensor of indoor coil pipe entrance short or cut off.---change sensor.
3，
Temp. sensor of indoor coil pipe middle short or cut off.---change sensor.
F4:
1，PG motor fault.---change motor. PG.
2，Fixed screw loose.---fix cross flow fan.
3，
Communication interfere. (earth wire can’t with communicate wire in same cable)---check cable.
F6：
1，Temp. sensor of discharge short or cut off.---change sensor.
2，Temp. sensor of suction short or cut off.---change sensor.
3，Temp. sensor of condenser middle short or cut off.---change sensor.
P2：（auto-restart）
1，over current protection of inverter module.
2，over voltage protection of inverter module.
3，high temp. protection of inverter module.
P3:
1，over load (outdoor ambient temp. more high).
2，Voltage over low.