Installation Instructions

12
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display is two LEDs (Red and Green) on the outdoor
unit board and is limited to very few errors.
The indoor diagnostic display is a combination of flashing LEDs
on the display panel or the front of the unit. 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 Tables 9 and 10.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 9 – Indoor Unit Diagnostic Guides
Operation Lamp Timer Lamp Display Failure Mode
☆ 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 has been out of control
☆ 5 times X E4 Indoor room temperature sensor is open circuit or short circuited
☆ 6 times X E5 Evaporator coil temperature sensor is open circuit or short circuited
☆ 2 times On F1 Outdoor temperature sensor is open circuit or short circuited
☆ 3 times On F2 Condenser coil temperature sensor is open circuit or short circuited
☆ 4 times On F3 Compressor discharge temperature sensor is open circuit or short circuited
☆ 5 times On F4 Outdoor unit EEPROM parameter error
☆ 1 time ☆ P0 IPM malfunction or IGBT overstrong current protection
☆ 2 times ☆ P1 High or low voltage low voltage protection activated
☆ 5 times ☆ P4 Inverter compressor drive error
☆ = Flashing, X = Off
For additional diagnostic information, refer to the Service Manual.
OUTDOOR UNIT DIAGNOSTIC GUIDES
Table 10 – Outdoor Unit Diagnostic Guides
Green LED Red LED Failure Mode
On X Standby, normal
X On Operation, normal
On On High/Low voltage protection on compressor terminal
On ☆ EEPROM error
X ☆ Compressor's speed is out of control
☆ On Zero-crossing signal detection error; lack of phase; synchronization error
☆ X IGBT or Module protection
☆ ☆ Communication error
☆ = Flashing, X = Off
For additional diagnostic information, refer to the Service Manual.
Copyright 2016 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: 38-40MF-05SI
Replaces: 38-40MF- 04SI
Edition Date: 09/16