Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53400023-01
Printed in U.S.A.
Form 40W-8SI
Pg 8
1-16
Replaces: 40W-4SI
© Carrier Corporation 2016
Table 2 — Error Codes
ERROR
CODE
DESCRIPTION
POSSIBLE CAUSES
POSSIBLE SOLUTIONS
E1
Indoor unit and outdoor unit
communication failure
Signal wires are short-circuited or
disconnected.
Check or reconnect signal wire.
Signal wire order is incorrect.
Correct signal wire order.
Signal wires crossing over high voltage power
wires.
Separate and distance the signal wire from high
voltage power wires.
Signal wire close to electromagnetic source.
Distance signal wires from electromagnetic
source.
Signal wire length exceeds 360 ft.
Reduce the signal wire length.
PC board fault.
Replace PC board.
E2
T1 sensor malfunction
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.
E3
T2A sensor malfunction
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.
E4
T2B sensor malfunction
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.
E5
Outdoor unit fault protection
Outdoor unit fault.
Refer to outdoor unit troubleshooting guide.
E7
Indoor unit EEPROM failure
Chip or PC board fault.
Replace PC board.
EC
Change/clean filter reminder
Run time has elapsed.
Clear the code by pressing and holding the
SWING button and pressing the QUERY button
at the same time.
EE
Water level error
Loose connection or disconnected at port on PC
board.
Tighten the connection or reconnect at port on
PC board.
Water level float is stuck.
Inspect the float.
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.
P0
Evaporator temperature
protection
Evaporator coils are covered with dirt and dust
Clean the coils to increase heat transfer rate.
Incorrect sensor wiring
Correct sensor wiring as per wiring diagram.
Sensor is short-circuited
Using multi-meter, measure resistance of the
sensor. If the resistance is
100 ohms, change
the sensor.
a40-1889
In this example:
1. The indoor unit with the address 08 is being queried.
2. The unit with the address 08 has an error, code E1.
3. In the address grid, the small block at 00+,08 blinks, indicating an
error.
4. In the grid, only the indoor units at addresses 00+,00 and 16+,15 are
lit. This means only that only the indoor units with the addresses of 00
and 31 are powered on.
Fig. 13 — Error Display Screen (Example)
