Heat Pump Control ....................................59
Heat Pump Cooling Operation .....................59
Heat Pump Heating Operation .....................59
Heat Pump Defrost Operation......................59
Supplemental Heating/Compressor Heating Transitions ........59
Compressor Heating Operation State Machine –
Heat Pump Units Only ...........................60
Heat Pump.............................................61
Heating O...........................................61
Initialization ....................................61
Normal Heat Pump Control ..............................65
Normal Heating .................................65
Pumpdown ....................................66
Standby for Restart ..............................66
Defrost Control........................................67
Defrost Operation – Heat Pump Units Only ...........67
Defrost Operation State ..........................67
4 Way Reversing Valve Control (4WV) –
Heat Pump Units Only ...........................68
Receiver Solenoid Valve Control (SVR) ..............68
Bypass Solenoid Valve Control (SVB) ...............68
Troubleshooting ........................................69
Inverter Board Fault Codes ..............................69
IFBCommStatus ................................70
ACS1 DataRcvd ................................71
ACS3 DataRcvd ................................71
CHECK 1 .....................................74
CHECK 2 .....................................74
CHECK 3 – Power Resistor Check ............... 75
ERROR CODE: E5 – Inverter Compressor Motor Lock ........ 76
ERROR CODE: E7 – Malfunction of Outdoor Unit Fan Motor ...78
ERROR CODE: H7 – Abnormal Outdoor Fan Motor Signal .... 80
ERROR CODE: L1 – Defective Inverter PC Board ..........81
ERROR CODE: L4 – Malfunction of Inverter Radiating
Fin Temperature Rise...................................83
Thermistor Resistance/Temperature Characteristics ....85
ERROR CODE: L5 – Momentary Overcurrent of
Inverter Compressor ...................................86
ERROR CODE: L8 – Momentary Overcurrent of
Inverter Compressor ...................................88
ERROR CODE: L9 – Inverter Compressor Starting Failure ....90
ERROR CODE: P1 – Inverter Over-Ripple Protection ........92
ERROR CODE: P4 – Malfunction of Inverter Radiating
Fin Temperature Rise Sensor ............................94
Thermistor Resistance/Temperature Characteristics ....96
ERROR CODE: PJ – Faulty Field Setting after Replacing
Main PC Board or Faulty Combination of PC Board ...........97
ERROR CODE: U2 – Power Supply Insucient or
Instantaneous Failure ..................................98
Appendix – General ....................................100
Supply Fan Failure Codes ..............................100
HLL = Hall Sensor Error .........................100
TFEI = Electronics Interior Overheated .............100
First occurrence: ..............................100
Repeated occurrence:...........................100
TFM = Motor Overheated ........................100
First occurrence: ...............................100
Repeated occurrence:...........................100
TFE = Power Mod Overheated .................... 101
First occurrence: ...............................101
Repeated occurrence:...........................101
BLK = Locked Motor ............................101
First occurrence: ...............................101
Repeated occurrence:...........................101
SKF = Communication Error......................101
First occurrence: ...............................101
Repeated occurrence:...........................101
PHA = Phase failure ............................102
Repeated occurrence:...........................102
Appendix – Sample Wiring Diagrams: Rebel 3-15 Tons .......105
Appendix – Sample Wiring Diagrams: Rebel 16-28 Tons ......109
www.DaikinApplied.com 3 OM 1263 • MICROTECH UNIT CONTROLLER
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