Brand: Allied Air Enterprises
Category: Heat Pump
Manual Type:
Language:
Manual for 4SHP16LS SERIES - Troubleshooting and error codes + PDF Download
Uploaded: March 30, 2025, 4:25 p.m.
Warranty Summary
Unit warranty will be void, if the drier is not installed.
The outdoor unit and indoor blower operate based on demand from the room thermostat. The indoor blower can also operate continuously if the thermostat blower switch is set to the ON position. The unit includes a bi-flow filter drier to keep the system clean and dry. If equipped with a crankcase heater, it should be energized 24 hours before start-up. Some thermostats offer an emergency heat function to isolate the outdoor unit and use auxiliary heat. The control board manages pressure switch circuits and defrost operation to ensure efficient and safe operation.
Troubleshooting and error codes
| Code | Diagnostic Codes / Status of Equipment | Action Required to Clear and Recover |
|---|---|---|
| E105 | Device communication problem - No other devices on RS BUS (Communication system). | Equipment is unable to communicate. Indicates numerous message errors. In most cases, errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for mis-wired and/or loose connections between the stat, indoor unit, and outdoor unit. Check for a high voltage source of noise close to the system. Fault clears after communication is restored. |
| E120 | Unresponsive device (Communicating systems only). | Usually caused by delay in outdoor unit responding to indoor unit poling. Recycle power. Check all wiring connections. Cleared after unresponsive device responds to any inquiry. |
| E124 | Active communicating thermostat signal missing for more than 3 minutes (Communicating systems only). | Equipment lost communication with the thermostat. Check four wiring connections, ohm wires, and cycle power at the thermostat. Alert stops all services and waits for heartbeat message from thermostat (subnet controller). Cleared after valid thermostat (subnet) message is received. |
| E125 | Control failed self-check, internal error, failed hardware. Will restart if error recovers, Integrated control not communicating Covers hardware errors (flame sense circuit faults, pin shorts, etc). | Hardware problem on the control. Cycle power on control. Replace if problem prevents service and is persistent. Cleared 300 seconds after fault recovered. |
| E126 | Control internal communication problem. | Hardware problem on the control. Cycle power on control. Replace if problem prevents service and is persistent. Cleared 300 seconds after fault recovered. |
| E131 | Corrupted control parameters (Verify configuration of system) (Communicating systems only). | Reconfigure the system. Replace control if heating or cooling is not available. Only applicable in the communicating mode not in startup. Exit from Commissioning and Execute Se+ factory Default mode. Control will still operate on default parameter settings. |
| E180 | Outdoor air temperature sensor failure. Only shown if shorted or out of range (Communicating systems only) | Compare outdoor sensor resistance to temperature resistance charts in unit installation instructions. Replace sensor pack if necessary. At beginning of (any) configuration, furnace or air handler control will sense outdoor air and discharge air temperature sensor(s) If detected (reading in range), appropriate feature will be set as installed and that could be seen in 'About' screen. In normal operation after control recognizes sensors, alarm will be sent if valid temperature reading is lost. To get rid of setting and alarm, redo configuration and make sure that temperature sensor is marked as not installed in indoor Unit 'About' screen. When indoor unit control is replaced thermostat will 'tell' new control if temperature sensor is in system or not. Clears 30 seconds after fault recovered. |
| E409 | LSOM - Compressor low voltage. | Secondary voltages below 18VAC. After 10 minutes, operation is discontinued. Clears the code after voltage is higher than 20VAC for 2 seconds or after power reset. |
| E410 | The outdoor unit pressure is below the required limit. | Unit pressure is below the lower limit. The system is shut down. The low pressure switch for R-410A will open at 40 PSIG and close at 90 PSIG. Confirm that the system is properly charged with refrigerant. Check TXV, indoor unit blower motor, dirty filters or clogged refrigerant filter. Confirm that the evaporator coil is clean. The alarm clears after the pressure switch closes or after a power rest. |
| E411 | The low pressure switch has opened 5 times during one cooling cycle. As a result, the system will shut down. | Open low pressure switch error count reached 5 strikes. The low pressure switch for R-410A will open at 40 PSIG and close at 90 PSIG. Confirm that the system is properly charged with refrigerant. Check TXV, indoor unit blower motor, dirty filters or clogged refrigerant filter. Confirm that the evaporator coil is clean. The alarm clears after a power rest. |
| E412 | The outdoor unit pressure is above the required limit. The system will shut down. | Unit pressure is above the upper limit. System is shut down. The high pressure switch for R-410A will open at 590 PSIG and close at 418 PSIG. Confirm that the system is properly charged with refrigerant. Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after 4 consecutive normal compressor run cycles, the pressure switch closes or a power reset. |
| E413 | The high pressure switch has opened 5 times during one cooling cycle. As a result, the Comfort Sync thermostat will shut down. | Open high pressure switch error count reached 5 strikes. System is shut down. The high pressure switch for R-410A will open at 590 PSIG and close at 418 PSIG. Confirm that the system is properly charged with refrigerant. Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after a power reset. |
| E414 | The discharge line temperature is higher than the recommended upper limit of 279°F. | Discharge line temperature is > 279°F. Confirm that the system is properly charged with refrigerant. Check system operating pressures and compare to unit charging charts in installation manual. Confirm that the outdoor unit is clean. The alarm clears after the discharge temperature is < 225°F. |
| E415 | The discharge line temperature has been consistently higher than the recommended upper limit of 279°F. | Discharge line high temperature error count reached 5 strikes. Confirm that the system is properly charged with refrigerant. Check system operating pressures and compare to unit charging charts in installation manual. Confirm that the outdoor unit is clean. The alarm clears after the discharge temperature is < 225°F. The alarm clears after a power reset. |
Troubleshooting and error codes
| Code | Diagnostic Codes / Status of Equipment | Action Required to Clear and Recover |
|---|---|---|
| E105 | Device communication problem - No other devices on RS BUS (Communication system). | Equipment is unable to communicate. Indicates numerous message errors. In most cases, errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for mis-wired and/or loose connections between the stat, indoor unit, and outdoor unit. Check for a high voltage source of noise close to the system. Fault clears after communication is restored. |
| E120 | Unresponsive device (Communicating systems only). | Usually caused by delay in outdoor unit responding to indoor unit poling. Recycle power. Check all wiring connections. Cleared after unresponsive device responds to any inquiry. |
| E124 | Active communicating thermostat signal missing for more than 3 minutes (Communicating systems only). | Equipment lost communication with the thermostat. Check four wiring connections, ohm wires, and cycle power at the thermostat. Alert stops all services and waits for heartbeat message from thermostat (subnet controller). Cleared after valid thermostat (subnet) message is received. |
| E125 | Control failed self-check, internal error, failed hardware. Will restart if error recovers, Integrated control not communicating Covers hardware errors (flame sense circuit faults, pin shorts, etc). | Hardware problem on the control. Cycle power on control. Replace if problem prevents service and is persistent. Cleared 300 seconds after fault recovered. |
| E126 | Control internal communication problem. | Hardware problem on the control. Cycle power on control. Replace if problem prevents service and is persistent. Cleared 300 seconds after fault recovered. |
| E131 | Corrupted control parameters (Verify configuration of system) (Communicating systems only). | Reconfigure the system. Replace control if heating or cooling is not available. Only applicable in the communicating mode not in startup. Exit from Commissioning and Execute Se+ factory Default mode. Control will still operate on default parameter settings. |
| E180 | Outdoor air temperature sensor failure. Only shown if shorted or out of range (Communicating systems only) | Compare outdoor sensor resistance to temperature resistance charts in unit installation instructions. Replace sensor pack if necessary. At beginning of (any) configuration, furnace or air handler control will sense outdoor air and discharge air temperature sensor(s) If detected (reading in range), appropriate feature will be set as installed and that could be seen in 'About' screen. In normal operation after control recognizes sensors, alarm will be sent if valid temperature reading is lost. To get rid of setting and alarm, redo configuration and make sure that temperature sensor is marked as not installed in indoor Unit 'About' screen. When indoor unit control is replaced thermostat will 'tell' new control if temperature sensor is in system or not. Clears 30 seconds after fault recovered. |
| E409 | LSOM - Compressor low voltage. | Secondary voltages below 18VAC. After 10 minutes, operation is discontinued. Clears the code after voltage is higher than 20VAC for 2 seconds or after power reset. |
| E410 | The outdoor unit pressure is below the required limit. | Unit pressure is below the lower limit. The system is shut down. The low pressure switch for R-410A will open at 40 PSIG and close at 90 PSIG. Confirm that the system is properly charged with refrigerant. Check TXV, indoor unit blower motor, dirty filters or clogged refrigerant filter. Confirm that the evaporator coil is clean. The alarm clears after the pressure switch closes or after a power rest. |
| E411 | The low pressure switch has opened 5 times during one cooling cycle. As a result, the system will shut down. | Open low pressure switch error count reached 5 strikes. The low pressure switch for R-410A will open at 40 PSIG and close at 90 PSIG. Confirm that the system is properly charged with refrigerant. Check TXV, indoor unit blower motor, dirty filters or clogged refrigerant filter. Confirm that the evaporator coil is clean. The alarm clears after a power rest. |
| E412 | The outdoor unit pressure is above the required limit. The system will shut down. | Unit pressure is above the upper limit. System is shut down. The high pressure switch for R-410A will open at 590 PSIG and close at 418 PSIG. Confirm that the system is properly charged with refrigerant. Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after 4 consecutive normal compressor run cycles, the pressure switch closes or a power reset. |
| E413 | The high pressure switch has opened 5 times during one cooling cycle. As a result, the Comfort Sync thermostat will shut down. | Open high pressure switch error count reached 5 strikes. System is shut down. The high pressure switch for R-410A will open at 590 PSIG and close at 418 PSIG. Confirm that the system is properly charged with refrigerant. Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after a power reset. |
| E414 | The discharge line temperature is higher than the recommended upper limit of 279°F. | Discharge line temperature is > 279°F. Confirm that the system is properly charged with refrigerant. Check system operating pressures and compare to unit charging charts in installation manual. Confirm that the outdoor unit is clean. The alarm clears after the discharge temperature is < 225°F. |
| E415 | The discharge line temperature has been consistently higher than the recommended upper limit of 279°F. | Discharge line high temperature error count reached 5 strikes. Confirm that the system is properly charged with refrigerant. Check system operating pressures and compare to unit charging charts in installation manual. Confirm that the outdoor unit is clean. The alarm clears after the discharge temperature is < 225°F. The alarm clears after a power reset. |