GENERAL AIRSTAGE Technical Reference
ARTH36KHTA / ARTH45KHTA / ARTH54KHTA / ARTH60KHTA
Service manual, diagnostics, function settings and spare parts quick reference
High static three-phase R32 inverter ducted systems with AOTH36KRTA, AOTH45KRTA, AOTH54KRTA and AOTH60KRTA outdoor units
This article is a technician quick-reference based on service manual SR_AR055EF_04 for the ARTH36KHTA, ARTH45KHTA, ARTH54KHTA and ARTH60KHTA high-static ducted range. Use the complete service manual for wiring diagrams, PCB layouts, full fault flowcharts, control logic and detailed service procedures.
Qualified service personnel only: These systems use R32 refrigerant and contain hazardous electrical voltages. Isolate the power supply before servicing and wait at least 5 minutes before touching electrical components. Refrigerant circuit work must only be performed by appropriately qualified personnel using equipment suitable for flammable refrigerants.
1. Model coverage
| Indoor unit | Outdoor unit | System power supply | Refrigerant |
|---|---|---|---|
| ARTH36KHTA | AOTH36KRTA | 380–415 V, 3N~, 50 Hz | R32 |
| ARTH45KHTA | AOTH45KRTA | 380–415 V, 3N~, 50 Hz | R32 |
| ARTH54KHTA | AOTH54KRTA | 380–415 V, 3N~, 50 Hz | R32 |
| ARTH60KHTA | AOTH60KRTA | 380–415 V, 3N~, 50 Hz | R32 |
Service manual revision: SR_AR055EF_04, dated 14 July 2023. The manual is structured into General Information, Technical Data and Parts List, Troubleshooting, Control and Functions, and Field Working.
2. Key specifications
| Specification | 36 | 45 | 54 | 60 |
|---|---|---|---|---|
| Rated cooling capacity | 10.0 kW | 12.5 kW | 14.0 kW | 15.5 kW |
| Rated heating capacity | 11.2 kW | 14.0 kW | 15.5 kW | 18.0 kW |
| High airflow | 695 L/s 2,500 m³/h | 903 L/s 3,250 m³/h | 986 L/s 3,550 m³/h | 986 L/s 3,550 m³/h |
| Standard static pressure | 60 Pa | |||
| Adjustable static pressure range | 60–210 Pa | 60–260 Pa | ||
| Liquid pipe | Ø9.52 mm (3/8 in) | |||
| Gas pipe | Ø15.88 mm (5/8 in) | |||
| Factory refrigerant charge | 1.9 kg | 2.7 kg | 2.7 kg | 3.4 kg |
| ARTH36KHTA dimensions | 400 × 1,050 × 500 mm (H × W × D), net 39 kg |
| ARTH45 / 54 / 60KHTA dimensions | 425 × 1,250 × 490 mm (H × W × D), net 53 kg |
| AOTH36KRTA dimensions | 788 × 940 × 320 mm (H × W × D), net 53 kg |
| AOTH45 / 54KRTA dimensions | 998 × 940 × 320 mm (H × W × D), net 67 kg |
| AOTH60KRTA dimensions | 1,418 × 970 × 370 mm (H × W × D), net 96 kg |
| Factory pre-charge pipe length | 30 m |
| Maximum pipe length / height difference | 50 m maximum length / 30 m maximum height difference |
| Outdoor operating range | Cooling: -10 to 50°C | Heating: -15 to 24°C |
R32 minimum room size: The service manual includes minimum floor-area requirements based on the total refrigerant charge and installation height. Always check the applicable installation manual and total system charge before installation or refrigerant work.
3. Error codes
When an error is detected, a connected wired remote controller displays the error code. Where an indoor indicator or IR receiver is fitted, the Operation, Timer and Economy lamps can also identify the fault by their blink pattern. The outdoor control PCB can also display faults using its LED lamps.
| Code | Description |
|---|---|
| 11 | Serial communication error – reverse transfer (outdoor) or forward transfer (indoor) |
| 12 | Wired remote controller communication error |
| 15 | Automatic airflow adjustment error |
| 18 | External communication error |
| 23 | Combination error – check connected indoor/outdoor unit combination |
| 26 | Address setting error in wired remote controller |
| 29 | Connected unit number error |
| 32 | Indoor unit Main PCB error |
| 33 | Indoor unit motor electricity consumption detection error |
| 39 | Indoor unit power supply error for fan motor |
| 3A | Indoor unit communication circuit / wired remote controller circuit error |
| 41 | Room temperature sensor error |
| 42 | Indoor unit heat exchanger sensor error |
| 51 | Indoor unit fan motor error |
| 53 | Drain pump error |
| 5U | Indoor unit error |
| 61.5 | Outdoor unit missing phase wire error |
| 62 | Outdoor unit Main PCB error / outdoor unit model information error |
| 63 | Inverter error |
| 64 | PFC circuit error |
| 65 | Trip terminal L error |
| 71 | Discharge thermistor error |
| 72 | Compressor thermistor error |
| 73 | Outdoor heat exchanger liquid-outlet or middle/outlet thermistor error |
| 74 | Outdoor temperature thermistor error |
| 77 | Heat sink thermistor error |
| 84 | Current sensor error |
| 86 | High pressure switch error or pressure sensor error |
| 94 | Trip detection |
| 95 | Compressor motor control error |
| 97 | Outdoor unit fan motor error |
| 99 | 4-way valve error |
| A1 | Discharge temperature error |
| A3 | Compressor temperature error |
| A5 | Low pressure error |
| AC | Heat sink temperature error |
Checking stored error memory
- Stop the air conditioner and disconnect the power supply.
- Reconnect the power supply.
- During the initial 3 minutes ST period, start operation and press TEST RUN on the remote controller, or press the applicable indoor/receiver MANUAL AUTO button for 10 seconds or more.
- The stored error is displayed during this period. The manual states the available display window is approximately 2 minutes 20 seconds after power is restored.
Erase error memory: While the stored error is displayed, press MANUAL AUTO for a manual erase where the applicable indicator unit is fitted. The memory also clears automatically after at least 2 hours of normal error-free operation, excluding Fan mode.
4. Service diagnostic reference
| Component | Service check |
|---|---|
| Compressor terminals | R(U) = Red, S(V) = White, C(W) = Black. Outdoor inverter PCB outputs are P400 (U), P401 (V) and P402 (W). |
| AOTH36KRTA compressor winding | 2.164 Ω ±7% at 25°C. A reading of 0 Ω or infinity indicates a defective compressor. |
| AOTH45 / 54KRTA compressor winding | 1.546 Ω ±8% at 20°C. |
| AOTH60KRTA compressor winding | 1.160 Ω ±8% at 20°C. |
| Outdoor EEV coil | Measure from Red common to Blue, Orange, Yellow and White: 46 Ω ±3 Ω at 20°C. The service procedure also specifies a 12 V DC PCB drive check. |
| Indoor / outdoor DC fan motor | With the motor disconnected, check between Vm and GND. If the resistance is below 300 kΩ, the manual directs replacement of the fan motor and associated controller PCB. |
| Pressure switch – P770 | Contact changes Short → Open at approximately 4.2 to 4.05 MPa and Open → Short at 3.2 ±0.15 MPa. |
| Pressure sensor – P20 | Measure between P20 terminals 2–3 with the connector fitted. Reference outputs: 0 MPa = 0.50 V, 1 MPa = 1.30 V, 2 MPa = 2.10 V, 3 MPa = 2.90 V, 4 MPa = 3.70 V, 5 MPa = 4.50 V. |
Thermistor quick checks
| Sensor | 0°C | 20°C | 30°C |
|---|---|---|---|
| Indoor room thermistor | 33.62 kΩ | 12.54 kΩ | 8.04 kΩ |
| Indoor heat exchanger / pipe thermistor | 176.03 kΩ | 62.91 kΩ | 39.57 kΩ |
Diagnosis: Use the error-specific flowchart in the full service manual before condemning a PCB, compressor or motor. The flowcharts include connector checks, supply-voltage checks, serial-signal measurements and component-specific tests.
5. Common function settings
Indoor function settings can be changed using the applicable wired remote controller. After completing a function-setting change, turn the power off, wait at least 30 seconds, then turn the power back on. The setting does not become active until the system is power-cycled.
| Function | Purpose | Useful settings |
|---|---|---|
| 11 | Filter sign interval | 00 = 2,500 h; 01 = 4,400 h; 02 = 1,250 h; 03 = No indication (factory) |
| 26 | Static pressure | 06 = 60 Pa through 26 = 260 Pa; 31 = Standard 60 Pa (factory); 32 = Automatic airflow adjustment. ARTH36 is limited to 210 Pa; ARTH45/54/60 to 260 Pa. |
| 30 / 31 | Room temperature correction – indoor sensor | Cooling / heating correction from -4.0°C to +4.0°C. 00 = Standard (factory). Refer to the manual table for the required setting value. |
| 35 / 36 | Room temperature correction – wired controller sensor | Cooling / heating correction from -4.0°C to +4.0°C. Function 42 must be set appropriately when using the wired-controller sensor. |
| 40 | Auto restart | 00 = Enable (factory); 01 = Disable |
| 42 | Room temperature sensor switching | 00 = Indoor unit (factory); 01 = Both indoor unit and wired-controller sensors |
| 43 | Cold air prevention | 00 = Enable (factory); 01 = Disable |
| 46 | External input control | 00 = Operation/Stop mode 1, remote controller enabled (factory); 01 = prohibited; 02 = Forced stop; 03 = Operation/Stop mode 2, remote controller disabled |
| 48 | Room temperature sensor switching (Aux.) | 00 = Both; 01 = Wired remote controller (factory). Function 42 must be 01 for this function to operate. |
| 49 | Indoor fan energy saving in cooling | 00 = Disable; 01 = Enable; 02 = Remote controller (factory) |
| 60 | External output terminal function | 00 = Operation status (factory); 01–08 = prohibited; 09 = Error status; 10 = Indoor unit fan operation status; 11 = External heater output |
| 68 | Auto mode type | 00 = Single setpoint auto mode (factory); 01 = Dual setpoint auto mode |
| 69 | Deadband value | 00 = 0°C (factory); 01 = 0.5°C through 09 = 4.5°C |
Indoor PCB settings
| SW100 | Remote controller address setting for 3-wire control. Addresses 00–15 are set using DIP switches 1–4. Factory setting is address 00 with all switches OFF. |
| SW101 switch 3 | Fan delay. ON = enabled; OFF = disabled (factory). When enabled, the indoor fan continues for 1 minute after the indoor unit stops while operating in conjunction with an auxiliary heater. |
Outdoor local settings
Outdoor unit functions are set from the outdoor control PCB. The service manual identifies the following switch buttons:
| Switch | Function |
|---|---|
| S134 – MODE | Switches between local setting and error-code display. |
| S133 – SELECT | Moves through the available local settings / display selections. |
| S132 – ENTER | Confirms the selected local setting / display selection. |
| S131 – EXIT | Returns to the normal operation-status display. |
| S130 – PUMP DOWN | Starts the pump-down operation. |
The local setting procedure includes Low Noise mode and Peak Cut mode. Peak Cut selections are 0%, 50%, 75% or 100% of rated input ratio. Refer to the full manual for the required LED patterns and setting sequence.
6. Common service parts
Part numbers below are taken from the supplied service manual. Parts information can change; always confirm the latest supersession and availability before ordering.
Indoor unit parts
| Part | Part No. | Applies to |
|---|---|---|
| Main PCB | 9712270022 | ARTH36KHTA |
| Main PCB | 9712270039 | ARTH45KHTA |
| Main PCB | 9712270046 | ARTH54KHTA |
| Main PCB | 9712270053 | ARTH60KHTA |
| Power supply PCB | 9712275003 | ARTH36KHTA |
| Power supply PCB | 9712213005 | ARTH45KHTA / ARTH54KHTA / ARTH60KHTA |
| Communication PCB | 9710019005 | All indoor models |
| DC fan motor | 9604104008 | ARTH36KHTA |
| DC fan motor | 9604111006 | ARTH45KHTA / ARTH54KHTA / ARTH60KHTA |
| Evaporator assembly | 9372584347 | ARTH36KHTA |
| Evaporator total assembly | 9380206156 | ARTH45KHTA / ARTH54KHTA / ARTH60KHTA |
| Room thermistor | 9900826062 | ARTH36KHTA |
| Room thermistor | 9703299254 | ARTH45KHTA / ARTH54KHTA / ARTH60KHTA |
| Pipe thermistor | 9901075049 | ARTH36KHTA |
| Pipe thermistor | 9901075056 | ARTH45KHTA / ARTH54KHTA / ARTH60KHTA |
| Wired remote controller | 9383418181 | All indoor models |
Outdoor unit parts
| Part | Part No. | Applies to |
|---|---|---|
| Main PCB | 9711432452 | AOTH36KRTA |
| Main PCB | 9711432469 | AOTH45KRTA |
| Main PCB | 9711432476 | AOTH54KRTA |
| Main PCB | 9711432483 | AOTH60KRTA |
| Inverter PCB | 9709688328 | AOTH36KRTA |
| Inverter PCB | 9709688335 | AOTH45KRTA / AOTH54KRTA |
| Inverter PCB | 9709688342 | AOTH60KRTA |
| Compressor | 9383821011 | AOTH36KRTA – compressor assembly |
| Compressor | 9810626004 | AOTH45KRTA / AOTH54KRTA |
| Compressor | 9810628008 | AOTH60KRTA |
| DC fan motor | 9603732011 | AOTH36KRTA / AOTH60KRTA; AOTH60 uses two motors |
| DC fan motor | 9603733018 | AOTH45KRTA / AOTH54KRTA |
| Propeller fan | 9383336003 | All outdoor models; AOTH60 uses two fans |
| Pressure switch | 9900186029 | All outdoor models |
| Expansion valve coil | 9970209000 | All outdoor models |
| Expansion valve assembly | 9370947373 | AOTH36KRTA |
| Expansion valve assembly | 9370947311 | AOTH45KRTA / AOTH54KRTA |
| Expansion valve assembly | 9370947342 | AOTH60KRTA |
| Compressor thermistor | 9900985035 | AOTH36KRTA |
| Compressor thermistor | 9900985028 | AOTH45KRTA / AOTH54KRTA / AOTH60KRTA |
| Condenser assembly | 9374420612 | AOTH36KRTA |
| Condenser assembly | 9374420605 | AOTH45KRTA / AOTH54KRTA |
| Heat exchanger unit | 9383860188 | AOTH60KRTA |
7. Compatible controllers and optional parts
| Accessory | Model | Connection / purpose |
|---|---|---|
| Wired Remote Controller – Touch Panel / zone capable | UTY-RNRT | Non-polar 2-wire |
| Wired Remote Controller – Touch Panel | UTY-RNRYT | Non-polar 2-wire |
| Wired Remote Controller | UTY-RVNYN | Polar 3-wire |
| Simple Remote Controller | UTY-RSRYT / UTY-RHRYT | Non-polar 2-wire |
| Simple Remote Controller | UTY-RSNYN | Polar 3-wire |
| IR Receiver Kit with wireless controller | UTY-LBTYM | Connects to CN48 on indoor Main PCB |
| Remote Sensor Unit | UTY-XSZXT | Room temperature sensor; connects to CN8 |
| Long-life Filter | UTD-LF60KA | For ARTH36KHTA |
| External Connect Kit | UTY-XWZXZG | Control output; connects to CN47 |
| External Input / Output PCB | UTY-XCSX | Connects to CN65 or CN75; External Connect Kit required |
| External Input / Output PCB Box | UTZ-GXEA | Mounting box for the external input/output PCB |
| Zone Control Interface – 3-wire | UTY-CDPXZC / UTY-CDPXZD | Polar 3-wire zone control interface |
| Zone Control Interface – 2-wire | UTY-CDRXZC / UTY-CDRXZD | Non-polar 2-wire zone control interface |
| Modbus Converter | UTY-VMSX | UART connection via CN65 or CN75 |
| KNX Converter | UTY-VKSX | UART connection via CN65 or CN75 |
| Network Converter | UTY-VTGX | Connects the single-split system to a VRF network via Y1/Y2 |
| Network Converter – AC power supply | UTY-VTGXV | Connects the single-split system to a VRF network via Y1/Y2 |
| External Switch Controller | UTY-TERX | External sensor/switch control via Y1/Y2 |
| Outdoor External Connect Kit | UTY-XWZXZ3 | Outdoor external input/output functions |
8. What is covered in the full service manual
| General Information | Specifications, dimensions, installation clearances, maintenance access and R32 minimum room-size requirements. |
| Technical Data & Parts | Exploded parts, accessories, optional parts, refrigerant circuit diagrams, wiring diagrams and PCB diagrams. |
| Troubleshooting | Error memory, error codes, fault-by-fault flowcharts, troubleshooting without error codes, compressor/EEV/fan checks, pressure checks and thermistor resistance tables. |
| Control & Functions | Compressor rotation control, auto changeover, indoor/outdoor fan control, timers, defrost, auto restart, economy, fresh-air control, EEV control, drain-pump control, demand response, peak cut, low-noise operation and protective controls. |
| Field Working | Indoor and outdoor function settings plus indoor/outdoor external input and output configuration. |
Freshdesk attachment: Attach the complete ARTH36–60KHTA / AOTH36–60KRTA service manual to this solution so technicians can open the original wiring diagrams, PCB diagrams and detailed troubleshooting procedures when required.
Technical note: This article is a quick-reference summary. Always verify the model, serial number, current service documentation and latest spare-part supersession before diagnosis, repair or ordering. Testing values are reference values from the supplied service manual; measurement conditions and tolerances must be followed as specified in the manual.