18SEER Condensing & Air Handler
Troubleshooting Manual
Model No.: 18S-EHVC*WD2V / 18S-EHVC*WD2H
18S-EHVH*WD2V / 18S-EHVH*WD2H
Thank you very much for purchasing our air conditioner. Please read this owen’s manual carefully before using your air conditioner.
Troubleshooting
THANK YOU Congratulations on your purchase and welcome to the Family. Your new Air Conditioner combines high-efficiency operation with portable convenience. By following the operating and care instructions in this manual, your air conditioner will provide you with many years of reliable service. Please visit our website www.keplerx.net For any questions or Technical Support, please contact us by mail info@keplerx.net or by phone 1-866-466-3451.
TROUBLESHOOTING
Parameter point check table
1. Top discharge outdoor unit
For 18S-EHV*24WD2V, 18S-EHV*36WD2V
Function description for the corresponding position:
| No. | Content | No. | Content |
| 1 | Compressor wiring terminal | 12 | High/Low pressure switch ports |
| 2 | DC fan motor wiring terminal | 13 | AC fan motor wiring terminal |
| 3 | Transformer | 14 | Four-way valve control port |
| 4 | Outdoor display board wiring terminal | 15 | Crankcase Heating zone control terminal |
| 5 | Reserved | 16 | Chassis Electric Heater control terminal |
| 6 | 24V wire controller interface | 17 | Solenoid valve2 control terminal |
| 7 | EXV drive port | 18 | Power supply connecting terminal |
| 8 | Exhaust temperature sensor port(T5) | 19 | Power supply connecting terminal |
| 9 | Outdoor ambient temperature sensor port(T4) | 20/21 | Relay |
| 10 | Condenser temperature sensor port(T3) | 22 | Inductor wiring terminal 1 |
| 11 | Pressure sensors ports | 23 | Inductor wiring terminal 2 |
For 18S-EHV*48WD2V, 18S-EHV*60WD2V
Function description for the corresponding position:
| No. | Content | No. | Content |
| 1 | Compressor wiring terminal | 12 | AC fan motor wiring terminal |
| 2 | DC fan motor wiring terminal | 13 | Four-way valve control port |
| 3 | Transformer | 14 | Crankcase Heating zone control terminal |
| 4 | Outdoor display board wiring terminal | 15 | Chassis Electric Heater control terminal |
| 5 | 24V wire controller interface | 16 | Solenoid valve control terminal |
| 6 | EXV drive port | 17 | Power supply connecting terminal |
| 7 | Exhaust temperature sensor port(T5) | 18 | Power supply connecting terminal |
| 8 | Outdoor ambient temperature sensor port(T4) | 19 | Relay |
| 9 | Condenser temperature sensor port(T3) | 20 | Relay |
| 10 | Pressure sensors ports | 21 | Inductor wiring terminal 1 |
| 11 | High/Low pressure switch ports | 22 | Inductor wiring terminal 2 |
2. Air handing unit
For 18S-EHV*24WD2H, 18S-EHV*36WD2H 18S-EHV*48WD2H 18S-EHV*60WD2H
Function description for the corresponding position:
| No. | Content | No. | Content |
| 1 | DC fan motor wiring terminal | 8 | Output port of transformer(11V) |
| 2 | Reserved | 9 | Dip switch to adjust fan speed |
| 3 | Chassis Electric Heater control terminal | 10 | Power supply connecting terminal(L1) |
| 4 | Reserved | 11 | Fan power cord input port(L1) |
| 5 | 24V wire controller interface | 12 | Input power cord transformer port |
| 6 | Output port of transformer(24V) | 13 | Power supply connecting terminal(L2) |
| 7 | Fuse | 14 | Fan power cord input port(L2) |
Error code
(1) The error codes for outdoor unit as follows:
| Definitions of malfunction | Error code |
| T4 Outdoor ambient temperature sensor error | E4 |
| T5 Discharge temperature sensor error | E5 |
| T3 Condenser temperature sensor error | E6 |
| AC under voltage protection | E9 |
| EEPROM error | E10 |
| IPM modular sensor error | E12 |
| HLP Pressure sensor error | E13 |
| T3 or T5 sensor disconnect error | E14 |
| High pressure switch error | E15 |
| Communication error of main chip and IPM chip | H0 |
| T3 sensor high temperature error(In cooling mode, 20 times P5 error within 180mins) | H1 |
| High pressure switch error(20 times P1 error within 150 mins) | H2 |
| High pressure abnormal in heating mode (20 times P13 error within 180 mins) | H3 |
| IPM modular high temp error (20 times P8 within 120 mins) | H4 |
| Low pressure error (20 times P2 within 100 mins) | H5 |
| Discharge temperature abnormal error(20 times P4 within 100 mins) | H6 |
| Wet operation error (20 times P12 within 200 mins) | H7 |
| T3 condenser sensor disconnect error (20 times E14 within 100 mins) | H8 |
| Discharge temp sensor disconnect error(20 times E14 within 180 mins) | H12 |
| High pressure protection | P1 |
| Low pressure protection | P2 |
| DC over current protection | P3 |
| T5 Discharge temperature abnormal error | P4 |
| T3 Condenser sensor high temp protection(In cooling mode) | P5 |
| IPM module protection | P6 |
| IPM high temperature protection (Ft)M high temperature protection (Ft) | P8 |
| DC fan motor error | P9 |
| Wet operation error | P12 |
| High pressure abnormal error(In heating mode) | P13 |
| High compression ratio protection | P14 |
| Low compression ratio protection | P15 |
| DC cable bus low voltage protection | L1 |
| DC cable bus high voltage protection | L2 |
| MCE fault / sync / closed loop | L4 |
| Zero speed protection | L5 |
| Compressor phase loss protection ratio protection | L7 |
| Compressor stalls | L8 |
| Frequency limitation or decline by high pressure | L9 |
| Frequency limitation by voltage | LA |
| Frequency limitation by condenser temp. | LC |
| Frequency limitation by discharge temp | LD |
| Frequency limitation by IPM modular high temp | LE |
| Frequency limitation by current | LF |
| Oil return | d0 |
| Defrost | dF |
| Force cooling | dH |
(2) Troubleshooting by error code
| E4/E5/E6 (T4/T5/T3 temperature sensors error) | |
| Diagnosis | Handling |
 |
|
| E10 (EEPROM failure） | |
| Diagnosis | Handling |
 |
|
| E9 ( AC under voltage protection ) | |
| Diagnosis | Handling |
 |
|
| E12 (IPM modular sensor error） | |
| Diagnosis | Handling |
 |
|
| E13 (HLP Pressure sensor error） | |
| Diagnosis | Handling |
 |
|
| E14/H8/H12 (T3 or T5 sensor disconnect error ) | |
| Diagnosis | Handling |
 |
|
| E15 ( High pressure switch error ) | |
| Diagnosis | Handling |
 |
|
| H0 (Communication error of main chip and IPM chip ) | |
| Diagnosis | Handling |
 |
|
| P1/H2 ( High pressure switch protection ) | |
| Diagnosis | Handling |
 |
|
| P2/H5 (Low pressure switch protection） | |
| Diagnosis | Handing |
 |
|
| P5/H1( T3 condenser sensor high temp protection ) | |
| Diagnosis | Handling |
 |
|
| P6 (IPM module protection） | |
| Diagnosis | Handling |
 |
|
| P8/H4 (IPM high temperature protection） | |
| Diagnosis | Handling |
 |
|
| P9 ( DC fan motor error ) | |
| Diagnosis | Handling |
 |
|
| P5/H1 (T3 condenser sensor high temp protection) | |
| Diagnosis | Handling |
 |
|
| P13/H3(High pressure abnormal error(In heating mode) ) | |
| Diagnosis | Handling |
 |
|
| P14 (High compression ratio protection) | |
| Diagnosis | Handling |
 |
|
| P15 (Low compression ratio protection) | |
| Diagnosis | Handling |
 |
|
| L1/L2 (DC cable bus low/high voltage protection) | |
| Diagnosis | Handling |
 |
|
| L4-L8 (IPM module subdivision protection） | |
| Diagnosis | Handling |
 L9-LE (Frequency limitation protection, not error） |
|
Exploded views and part list
Air Handler Indoor unit
| No. | Part Name | Quantity | No. | Part Name | Quantity |
| 1 | Filter Cover plate | 1 | 3.8 | Evaporator Bafle | 1 |
| 2 | Water pan components | 1 | 3.9 | Evaporator Water Bafle #1 | 2 |
| 2.1 | Water pan# 1 | 1 | 3.10 | Evaporator Water Bafle #2 | 1 |
| 2.2 | Water pan# 2 | 1 | 3.11 | Evaporator Water Bafle #3 | 1 |
| 2.3 | Water pan fixed block | 1 | 3.12 | Evaporator Fixing Plate #1 | 1 |
| 2.4 | Water pan brace | 2 | 3.13 | Evaporator Fixing Plate #2 | 1 |
| 3.1 | Air header Assembly | 1 | 3.14 | Evaporator Junction Plate | 2 |
| 3.2 | Diverter Assembly | 1 | 3.15 | Evaporator Bafl eweld assembly | 1 |
| 3.3 | TXV | 1 | 4 | Chasiss assembly | 1 |
| 3.4 | Evaporator A | 1 | 5 | Supporter | 2 |
| 3.5 | Evaporator B | 1 | 6.1 | Right Volute Wind Wheel | 1 |
| 3.6 | Evaporator C | 1 | 6.2 | Indoor Motor | 1 |
| 3.7 | Evaporator D | 1 | 7 | Fan Motor Fixing plate assembly | 1 |
| No. | Part Name | Quantity | No. | Part Name | Quantity |
| 7.1 | Fan Motor Fixing plate | 1 | 9.1 | ELectronic Control Mounting Plate | 1 |
| 7.2 | Wind Wheel Fixed Block | 2 | 9.2 | Main Board | 1 |
| 7.3 | Fixed plate on air duct | 1 | 9.3 | Transformer | 1 |
| 7.4 | Stator | 2 | 10 | Water pan supporter assembly | 4 |
| 7.5 | air duct left stationary plate | 1 | 11 | Upper side plate assembly | 1 |
| 7.6 | air duct right stationary plate | 1 | 12 | Pipe Cover plate assembly | 1 |
| 8 | Electric control cover foam assembly | 1 | 13 | Lower side plate assembly | 1 |
| 9 | ELectronic Control Components | 2 |
Top discharge outdoor unit
| No. | Part Name | Quantity | No. | Part Name | Quantity |
| 1 | Cover net | 1 | 6 | Rear side panel | 1 |
| 2 | Outdoor motor | 1 | 7 | Left side panel | 1 |
| 3 | Axial-flow fan | 1 | 8 | Piping support plate | 2 |
| 4 | Top cover assembly | 1 | 9 | Cooling pipe components of refri | 1 |
| 5 | Support board | 3 | 10 | Return pipe welding assembly | 1 |
| No. | Part Name | Quantity | No. | Part Name | Quantity |
| 11 | Gas liquid separator | 1 | 16.3.2.3 | Pressure sensor | 1 |
| 12 | Top panel | 1 | 16.3.3 | Four-way valve connecting pipe #2 | 1 |
| 13 | Compressor | 1 | 16.3.4 | Four-way valve connecting pipe #3 | 1 |
| 14 | Chassis assembly | 1 | 16.3.5 | Coil of four-way valve | 1 |
| 15 | Left side panel | 1 | 17 | Radiator cover | 1 |
| 16.1 | High pressure valve welding assembly | 1 | 18 | Electronic components | 1 |
| 16.1.1 | High pressure valve connecting pipe | 1 | 18.1 | Outdoor communication display board | 1 |
| 16.1.2 | Square valve | 1 | 18.2 | Reactor | 1 |
| 16.2 | Electronic expansion valve assembly | 1 | 18.3 | Fan motor capacitance | 1 |
| 16.2.1 | Check valve | 1 | 18.4 | Electronically controlled mounting plate assy | 1 |
| 16.2.2 | Two-way filter | 2 | 18.5 | Reactor mount | 1 |
| 16.2.3 | Electronic expansion valve | 1 | 18.6 | Main control board mounting base | 1 |
| 16.2.4 | L-shaped tube | 1 | 18.7 | Communication board mounting base | 1 |
| 16.2.5 | Coil of electronic expansion valve | 1 | 18.8 | Terminal block mounting plate | 1 |
| 16.3 | Four way valve assembly | 1 | 18.9 | Terminal block | 1 |
| 16.3.1 | Four way valve | 1 | 18.10 | Reactor mounting cover welded parts | 1 |
| 16.3.2 | Four-way valve connecting pipe #1 assy | 1 | 18.11 | Outdoor inverter integrated board | 1 |
| 16.3.2.1 | Pressure Switch | 1 | 20 | Condenser parts | 1 |
| 16.3.2.2 | Four-way valve connecting pipe #1 | 1 | 20.2 | Condenser assembly | 1 |
| 16.3.2 | Four-way valve connecting pipe #4 assy | 1 | 20.1 | Condenser input pipe assembly | 1 |
| 16.3.2.1 | Square valve | 1 | 21 | Right side panel | 1 |
| 16.3.2.2 | Four-way valve connecting pipe #4 | 1 |
KeplerX Co.Ltd
120 US Route 46,
Parsippany, NJ 07054
Toll Free 1-866-466-3451
Documents / Resources
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KEPLERX 18SEER Condensing and Air Handler [pdf] Instruction Manual 18S-EHVC WD2V, 18S-EHVC WD2H, 18S-EHVH WD2V, 18S-EHVH WD2H, 18SEER Condensing and Air Handler, 18SEER, Condensing and Air Handler, Air Handler, Handler |