Alpha Heat Pumps: manuals, user guides and error codes
Looking for a Alpha heat pump manual, user guide, or error code explanation? ServiceMy has created a dedicated resource hub to help homeowners quickly find the information they need for their system.
Our guide library includes downloadable manuals, setup instructions, troubleshooting advice and clear explanations of common error codes. If your Alpha heat pump is showing a fault code, not heating properly, or you simply want to understand how to operate it more efficiently, our guides are designed to help you identify the issue and keep your system running smoothly. These resources are regularly updated and written by experienced heat pump engineers to help you get the most from your heating system, improve efficiency and avoid unnecessary breakdowns.
These apply for the following air source heat pump models:
- 3033346
- E-Tec EHP
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Heat pump malfunctions: Alpha Error Codes
If you cannot find the error code explanation or need help resolving any issues, ServiceMy can help diagnose and arrange a professional heat pump service to restore your system to optimum performance.
| Error Code | Title | Explanation |
| 231 | Phase Sequence Error | Incorrect electrical phase rotation or supply issue; check incoming power supply and wiring. |
| 701 | Low Pressure Fault | Refrigerant pressure too low; typically caused by leaks, low charge or restricted airflow. |
| 702 | Low Pressure Switch-Off (Auto Reset) | Temporary low pressure condition; system has shut down to protect compressor. |
| 703 | Antifreeze Protection Triggered | System temperature too low; risk of freezing within the heat exchanger or pipework. |
| 704 | Hot Gas Temperature Fault | Discharge temperature too high; often due to poor flow, refrigerant issues or compressor strain. |
| 705 | Motor Protection Fault | Compressor or fan motor overload; may be electrical issue or mechanical resistance. |
| 707 | Heat Pump Configuration / Coding Error | Incorrect system configuration or control board setup; may require reprogramming. |
| 708 | Return Temperature Sensor Fault | Fault with return water sensor; check wiring, sensor resistance or replacement. |
| 709 | Flow Temperature Sensor Fault | Flow sensor not reading correctly; affects heating performance and control logic. |
| 710 | Hot Gas Sensor Fault | Compressor discharge sensor failure; prevents safe monitoring of operating conditions. |
| 711 | External Temperature Sensor Fault | Outdoor air sensor failure; impacts weather compensation and system efficiency. |
| 712 | Domestic Hot Water Sensor Fault | Cylinder temperature sensor fault; may affect hot water production. |
| 713 | Heat Source ON Sensor Fault | Fault with sensor monitoring active heat source operation. |
| 714 | Hot Gas Switch Fault | Switch monitoring compressor discharge conditions has failed. |
| 715 | High Pressure Switch-Off (Auto Reset) | Temporary high pressure condition; system has paused to protect components. |
| 716 | High Pressure Fault | Refrigerant pressure too high; commonly caused by poor heat transfer, blocked airflow or system overcharge. |
| 718 | Maximum External Temperature Exceeded | Ambient temperature too high for safe operation; system protection mode activated. |
| 719 | Minimum External Temperature Exceeded | Ambient temperature too low; system may not operate efficiently or safely. |
| 721 | Low Pressure Switch-Off | System shut down due to sustained low pressure condition. |
| 722 | DHW Temperature Difference Fault | Unusual temperature delta during hot water operation; often circulation or sensor issue. |
| 723 | Heating Circuit Temperature Difference Fault | Abnormal flow/return temperature difference; may indicate poor circulation. |
| 724 | Defrost Temperature Difference Fault | Defrost cycle not performing correctly; possible airflow or sensor issue. |
| 725 | System Switching Fault | General internal control or relay switching error. |
| 726 | Mixing Circuit Sensor Fault | Fault in mixed circuit temperature sensor; impacts zone control. |
| 727 | Brine Pressure Fault | Ground loop pressure issue; check antifreeze levels, leaks or circulation pump. |
| 728 | Heat Source OFF Sensor Fault | Sensor monitoring inactive heat source has failed or is giving incorrect readings. |
| 766 | Compressor Operating Outside Limits | Compressor running outside safe parameters; may indicate deeper system or refrigerant issue. |
Schedule Your Heat Pump Service Today
Don’t wait until efficiency drops, or your pump encounters issues. Investing in routine maintenance for your air source heat pump is the best way to keep your household energy-efficient, cosy, and cost-effective year-round.
Get in touch with our professional servicing team today to schedule your appointment. With extensive experience in heat pump servicing and home energy solutions, we’re here to help you stay warm, save money, and protect your investment.
Maintain your heat pump, and it will reward you with years of efficient and reliable performance.
