Repair Section
58
Self-Diagnostic Codes - Table 2
Use TEMP+ or -TEMP button to scroll down the LCD screen with "T" mark.
Code Condition LCD Display and Description
CF
Cooling or heating function failure
When loss of cooling or heating occurs 3 times and the following
condition continues for 15 minutes, the unit stops, LCD displays “CF”,
and relay contact RL07 for terminal OS-1 and OS-2 closes.
During Cooling operation when RTS - CTS2 < 9 °F (5 °C), and during
Heating operation (except defrost operation) when ODS - CTS3 < 2 °F (1
°C) and ODS > 50 °F (10 °C).
E1
RTS thermistor failure
When the indoor air inlet thermistor becomes short or open, the unit
stops, LCD displays “E1”, and relay contact RL07 for terminal OS-1 and
OS-2 closes.
E2
ODS thermistor failure
When the outdoor air inlet thermistor becomes short or open, the unit
stops, LCD displays “E2”, and relay contact RL07 for terminal OS-1 and
OS-2 closes.
E3
CTS1 thermistor failure
When the indoor pipe thermistor becomes short or open, the unit stops,
LCD displays “E3”, and relay contact RL07 for terminal OS-1 and OS-2
closes.
E4
CTS2 thermistor failure
When the compressor pipe thermistor becomes short or open, the unit
stops, LCD displays “E4”, and relay contact RL07 for terminal OS-1 and
OS-2 closes.
E5
CTS3 thermistor failure
When the outdoor pipe thermistor becomes short or open, the unit stops,
LCD displays “E5”, and relay contact RL07 for terminal OS-1 and OS-2
closes.
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