40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
Indoor Unit Diagnostic Guide
Table 6 — Indoor Unit Error Display
NOTE: P3*
1. In the HEATING mode, if the outdoor temperature is lower than -13°F (-25°C) for 1 hour, the indoor unit displays a P3 error code.
2. If the outdoor temperature is higher than -7.6°F (-22°C) for 10 minutes and the compressor stops for 1 hour or the outdoor temperature is higher
than 23°F (-5°C) for 10 minutes, the unit returns to an operating mode.
* Fault Symptom: The display board shows a distorted code or a code that is not an error code found in the service manual nor a temperature
reading.
Error Display on Two Way Communication Wired Controller
OPERATION LAMP TIMER LAMP DISPLAY ERROR INFORMATION SOLUTION
1 time OFF EH00/EH0A Indoor unit EEPROM parameter error Page 15
2 times OFF EL 01 Indoor / outdoor unit communication error Page 16
4 times OFF EH 03 The indoor fan speed is operating outside of the normal range Page 18
4 times OFF EH 31
Upper indoor fan speed is operating outside of the normal range (for
new console type)
Page 18
4 times OFF EH 32
Lower indoor fan speed is operating outside of the normal range (for
new console type)
Page 18
6 times OFF EH 60
Indoor room temperature sensor T1 is in open circuit or has short
circuited
Page 21
6 times OFF EH 61
Evaporator coil temperature sensor T2 is in open circuit or has short
circuited
Page 21
8 times OFF EL 0C Refrigerant leakage detection Page 22
9 times OFF EH 0b Communication error between display board and main board Page 31
13 times OFF EH 0E Water-level alarm malfunction Page 23
5 times ON EC 51 Outdoor unit EEPROM parameter error Page 15
5 times OFF EC 52
Condenser coil temperature sensor T3 is in open circuit or has short
circuited
Page 21
5 times OFF EC 53
Outdoor room temperature sensor T4 is in open circuit or has short
circuited
Page 21
5 times OFF EC 54
Compressor discharge temperature sensor TP is in open circuit or
has short circuited
Page 21
5 times OFF EC 55 IGBT temperature sensor TH is in open circuit or has short circuited --
5 times OFF EC 56
Evaporator coil outlet temperature sensor T2B is in open circuit or
has short circuited (for free-match indoor units)
--
12 times OFF EC 07 The outdoor fan speed is operating outside of the normal range Page 18
7 times FLASH PC 00 IPM malfunction or IGBT over-strong current protection Page 24
2 times FLASH PC 01 Over voltage or over low voltage protection Page 25
3 times FLASH PC 02
Top temperature protection of compressor or High temperature
protection of IPM module
Page 29
7 times FLASH PC 03 High pressure protection or low pressure protection Page 27
5 times FLASH PC 04 Inverter compressor drive error Page 26
14 times OFF EC 0d Outdoor unit malfunction Page 30
15 times OFF FH 07
Communication malfunction between indoor unit and auto-lifting
panel
Page 34
-- -- EH bA
Communication malfunction between external fan module and indoor
unit (for some models)
Page 33
4 times OFF EH 3A External fan DC bus voltage is too low protection Page 33
4 times OFF EH 3b External fan DC bus voltage is too high fault Page 33
1 time ON -- Indoor units mode conflict (match with multi outdoor unit) --
4 times FLASH PC 0L Low ambient temperature protection Page 30
DISPLAY MALFUNCTION OR PROTECTION SOLUTION
EH b3 Communication error between wire controller and indoor unit (for the KSACN0701AAA series wired controller) Page 32
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