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Copyright 2021 CAC / BDP D 3300 Riverwood Parkway Atlanta GA, 30339 Edition Date: 01/21 Catalog No. IM-40MHH-02
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Replaces: IM-40MHH-01
SYSTEM CHECKS
1. Conceal the tubing where possible.
2. Make sure that 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 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 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 the Table 8.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 8 — Indoor Unit Diagnostic Guides
O (light) X (off) «(flash)
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
8 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 compressor top diagnosis and solution (9K,12K models only)
5 times
«
P4 Inverter compressor drive error