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DIAGNOSTIC CODES
The Diagnostic Maintenance provides detailed
information on PTAC control operation and operational
status including present modes, failures, airflow restriction
warnings , operating temperatures, and past failures.
To enter Diagnostic Status Report mode, press and hold
the temp down ( − ) key and the FAN SPEED key
simultaneously for a period of five (5) seconds.
The diagnostic information is presented in the following
format: X.Y
Where:
“X” indicates the failure type:
1 = anti-frost
2 = overheat
3 = high pressure
4 = anti-freezing
“Y” indicates the number of occurrences within a one
hour period (0~4: time of protection)
Note: If the number above is greater than 4, the
compressor shuts off and a Failure Code appears in the
display (e.g., “E8”). See chart below for Error Codes and
their meanings:
Failure Code
Content of defect
E2
Indoor coil temperature sensor failure
E3
Indoor temperature sensor failure
E5
Outdoor coil temperature sensor failure
E8
Overheating protection
/
defrosting
E9
High pressure protection
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