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Manufacturer of Quality Air Conditioning and Heating Products • www.islandaire.com • sales@islandaire.com • (800)-886-2759
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Error Codes
Diagnostic & Error Codes
CONTROL PANEL DISPLAY DIAGNOSTICS
Sensors in the unit continually monitor the indoor coil,
outdoor coil, and outdoor air conditions. If abnormal conditions
are detected, an error code is displayed, removing the guess work
in troubleshooting a unit.
AUTO
E2
Display - Error CodeFigure 47
ERROR CODE DIAGNOSIS CAUSE NOTE
E2
RETURN AIR (RA)
TEMPERATURE SENSOR FAILURE
RA SENSOR BROKEN OR LOOSE AT BOARD CONNECTION
UNIT OPERATION DISABLED
E3
INDOOR COIL (IDC)
TEMPERATURE SENSOR FAILURE
IDC SENSOR LOOSE OR BROKEN AT BOARD CONNECTION
UNIT OPERATION DISABLED
E5
OUTDOOR COIL (ODC)
TEMPERATURE SENSOR FAILURE
UNIT OPERATION DISABLED
E8
ODC SENSOR BROKEN OR LOOSE AT BOARD CONNECTION
UNIT OPERATION DISABLED
E9
OVERHEAT / FREEZE PROTECTION
• REFRIGERANT RESTRICTION
• DIRTY FILTER / EVAPORATOR COIL
• FAILED EVAPORATOR MOTOR
• RETURN SUPPLY AIR RESTRICTED
UNIT OPERATION DISABLEDSYN. FAULT TERMINALS OPEN
HIGH PRESSURE SWITCH OPEN:
• DIRTY CONDENSER COIL (COOLING)
• FAILED CONDENSER MOTOR (COOLING)
• ENSURE BAFFLES ARE INSTALLED (IF REQUIRED)
• REFRIGERANT RESTRICTION
• DIRTY FILTER / EVAPORATOR COIL (HEAT PUMP)
• EVAPORATOR MOTOR FAILURE (HEAT PUMP)
• ALL ADDITIONAL SAFETIES TIED TO SYN. FAULT TERMINALS
SHOULD BE CHECKED
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