15
Table 6 —Troubleshooting
ERROR
DESCRIPTION
POSSIBLE CAUSES
POSSIBLE SOLUTIONS
dd
Heating / Cooling Mode Conflict
System is in cooling or fan only mode and
heating signal is received from a unit on the
system.
All units should be in cooling mode for system to stay
in cooling mode.
System is in heating mode and cooling signal is
received from a unit in the system.
All units should be in heating mode.
E1
Communication Error Between Indoor
& Outdoor Unit
Signal wires are short-circuited or
disconnected.
Check or reconnect signal wire.
Signal wire close to electromagnetic source.
Distance signal wires from electromagnetic source.
PC board fault.
Replace PC board.
E2, E4, E5 Check Temperature Sensor
Loose connection at port on PC board.
Tighten the connection at port on PC board.
Sensor is short-circuited.
Using multi-meter, measure resistance of the sensor.
If the resistance is £ 100 ohms, change the sensor.
PC board fault.
Replace PC board.
E6
DC Fan Motor
Operating Beyond Limits.
Check and correct external static pressure on the
unit.
DC motor fault.
Replace DC motor.
PC board fault.
Replace PC board.
E7
EEPROM Error (Data Storage)
Chip or PC board fault.
Replace PC board.
E9
Communication Error Between Indoor
Unit & Controller
Signal wires are short-circuited or
disconnected.
Check or reconnect signal wires.
Signal wires close to electromagnetic source.
Distance signal wires from electromagnetic source.
PC board fault.
Replace PC board.
Eb
EEV Error
EEV wires are short-circuited or disconnected. Replace EEV wires.
EEV stop.
Replace EEV.
PC Board fault.
Replace PC board.
Ed
Outdoor Unit Error
Outdoor unit fault.
Refer to outdoor unit troubleshooting guide.
EE
Condensate Error
Loose connection or disconnected.
Tighten the connection or reconnect at port on PC
board.
Water level float is stuck.
Inspect the slope.
Trap slope is too steep.
Adjust the trap slope.
Drain pipe is too long.
Adjust the length of drain pipe.
Drain pump faulty.
Replace the drain pump.
FE
No Address when Power ON for First
Time
Indoor unit without address.
Run automatic addressing option at the outdoor unit.
Use remote wireless or wired controller to readdress
indoor unit.
UU
MDC Auto System-Check Mode
MDC fault
Refer to MDC troubleshooting guide.
LEGEND
EEPROM
—
Electronically Erasable Programmable Read-only Memory
EEV
—
Electronic Expansion Valve
MDC
—
Multiport Distribution Controller
PC
—
Process Controller
