14
SYSTEM CHECKS
1. Conceal the tubing where possible.
2. Ensure the drain tube slopes downward along its entire
length.
3. Ensure all tubing and connections are properly insulated.
4. Fasten tubes to the outside wall, when possible.
5. Seal the hole through which the cables and tubing pass.
INDOOR UNIT
1. Do all remote control buttons function properly?
2. Do the display panel lights work properly?
3. Does the air deflection louver function properly?
4. Does the drain work?
Explain Following Items To Customer
(with the aid of the Owner’s Manual):
1. How to turn air conditioner on and off; selecting
COOLING, HEATING and other operating modes; setting
a desired temperature; setting the timer to automatically start
and stop the air conditioner operation; and all other features
of the remote control and display panel.
2. How to remove and clean the air filter.
3. How to set air deflection louver.
4. Explain care and maintenance.
5. Present the Owner’s Manual and installation instructions to
customer.
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The indoor
diagnostic display is a combination of flashing LEDs on the
display panel or the front of the unit.
Some indoor units display error codes specifying failure modes in
the outdoor units. If possible, always check the diagnostic codes
displayed on the indoor unit first.
The diagnostic codes displayed in the indoor and outdoor units are
listed in Table 8.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 8—ID Units Error Code Display
OPERATION LAMP TIMER LAMP DISPLAY LED STATUS
☆ 1 time
X E0 Indoor unit EEPROM parameter error
☆ 2 times
X E1 Indoor / outdoor units communication error
☆ 3 times
X E2 Zero-crossing signal detection error
☆ 4 times
X E3 Indoor fan speed is out of control
☆ 5 times
X E4 Indoor room temperature sensor T1 open circuit or short circuit
☆ 6 times
X E5 Evaporator coil temperature sensor T2 open circuit or short circuit
☆ 7 times
X EC Refrigerant leakage detection
☆1 time
O F0 Overload current protection
☆ 2 times
O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit
☆ 3 times
O F2 Condenser coil temperature sensor T3 open circuit or short circuit
☆ 4 times
O F3 Compressor discharge temperature sensor T5 open circuit or short circuit
☆ 5 times
O F4 Outdoor unit EEPROM parameter error
☆ 6 times
O F5 Outdoor fan speed is out of control
☆ 1 time ☆
P0 IPM malfunction or IGBT over-strong current protection
☆ 2 times ☆
P1 Over voltage or over low voltage protection
☆ 3 times ☆
P2
High temperature protection of the compressor top diagnosis and solution
(only for 9k,12k models)
☆ 5 times ☆
P4 Inverter compressor drive error
O (on − light) X(off − light) ☆(flash)
For additional diagnostic information, refer to the Service Manual
Copyright 2017 Carrier Corporation S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 40MAQ-02SI
Replaces: 40MAQ-01SI
Edition Date: 09/17
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