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E2~E5: CHECK TEMPERATURE SENSOR
1. Error display:
IDU display: E2 (T1 sensor)
E3 (TA sensor)
E4 (T2B sensor)
E5 (T2A sensor)
2. Applicable models:
All indoor units
3. Definition:
• Temperature sensor (T1, TA, T2A, or T2B) on main board of indoor unit have an open or short circuit.
• The detected voltage > 4.95V or < 0.05V.
4. Possible causes:
• Bad connection between the temperature sensor and main board of IDU
• Damaged temperature sensor
• Damaged main board of IDU
• Interference from other heat source
*A Refer to Resistance table of ambient temperature sensor in Appendix.
Check whether the resistance of the sensor
is in the range of Table *A.
Check whether there are other heat
sources around sensor
Error resolved
Reset the sensor
Turn off, then turn on the unit.
Replace the faulty sensor
Check whether T1, TA, T2A or T2B sensor is
plugged in to the main board of indoor unit, and
connected according to the wiring diagram.
Remove all the other heat
YES
YES
YES
NO
NO
NO
NO
YES
Did the error clear?
sources
Replace main board of MDC for
Heat Recovery) or replace main
board of ODU for Heat Pump or
Single Phase
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