Carrier 40MBFAQ Service Manual

Also see for 40MBFAQ: Owner's manual Installation instructions

40MBFAQ: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.14Indoor Unit Diagnostic GuideTable 6 — Indoor Unit Error DisplayNOTE: 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 higherthan 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 temperaturereading.Error Display on Two Way Communication Wired ControllerOPERATION LAMP TIMER LAMP DISPLAY ERROR INFORMATION SOLUTION1 time OFF EH00/EH0A Indoor unit EEPROM parameter error Page 152 times OFF EL 01 Indoor / outdoor unit communication error Page 164 times OFF EH 03 The indoor fan speed is operating outside of the normal range Page 184 times OFF EH 31 Upper indoor fan speed is operating outside of the normal range (fornew console type) Page 184 times OFF EH 32 Lower indoor fan speed is operating outside of the normal range (fornew console type) Page 186 times OFF EH 60 Indoor room temperature sensor T1 is in open circuit or has shortcircuited Page 216 times OFF EH 61 Evaporator coil temperature sensor T2 is in open circuit or has shortcircuited Page 218 times OFF EL 0C Refrigerant leakage detection Page 229 times OFF EH 0b Communication error between display board and main board Page 3113 times OFF EH 0E Water-level alarm malfunction Page 235 times ON EC 51 Outdoor unit EEPROM parameter error Page 155 times OFF EC 52 Condenser coil temperature sensor T3 is in open circuit or has shortcircuited Page 215 times OFF EC 53 Outdoor room temperature sensor T4 is in open circuit or has shortcircuited Page 215 times OFF EC 54 Compressor discharge temperature sensor TP is in open circuit orhas short circuited Page 215 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 orhas short circuited (for free-match indoor units) --12 times OFF EC 07 The outdoor fan speed is operating outside of the normal range Page 187 times FLASH PC 00 IPM malfunction or IGBT over-strong current protection Page 242 times FLASH PC 01 Over voltage or over low voltage protection Page 253 times FLASH PC 02 Top temperature protection of compressor or High temperatureprotection of IPM module Page 297 times FLASH PC 03 High pressure protection or low pressure protection Page 275 times FLASH PC 04 Inverter compressor drive error Page 2614 times OFF EC 0d Outdoor unit malfunction Page 3015 times OFF FH 07 Communication malfunction between indoor unit and auto-liftingpanel Page 34-- -- EH bA Communication malfunction between external fan module and indoorunit (for some models) Page 334 times OFF EH 3A External fan DC bus voltage is too low protection Page 334 times OFF EH 3b External fan DC bus voltage is too high fault Page 331 time ON -- Indoor units mode conflict (match with multi outdoor unit) --4 times FLASH PC 0L Low ambient temperature protection Page 30DISPLAY MALFUNCTION OR PROTECTION SOLUTIONEH b3 Communication error between wire controller and indoor unit (for the KSACN0701AAA series wired controller) Page 32