Baxi Heat Pumps: manuals, user guides and error codes
Looking for a Baxi 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 Baxi 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:
- HP40-04-1PHMB
- HP40-05-1PHMB
- HP40-07-1PHMB
- HP40-08-1PHMB
- HP40-11-1PHMB
- HP40-13-1PHMB
- HP40-11-3PHMB
- HP40-13-3PHMB
Is your Baxi heat pump not functioning as it should?
Tell us when your heat pump was installed or last serviced and we’ll remind you when it’s due. Free, simple, no commitment. When your service is due, you’ll be the first to know.
Heat pump malfunctions: Baxi 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 |
| E01 | High Pressure Fault | System pressure too high; often caused by restricted flow, blocked heat exchanger, or poor heat dissipation. |
| E02 | Low Pressure Fault | Refrigerant pressure too low; typically due to leaks, low charge, or airflow issues. |
| E03 | Compressor Discharge Temperature Fault | Compressor temperature too high; may indicate low flow, refrigerant imbalance, or high load. |
| E04 | Ambient Temperature Sensor Fault | Outdoor temperature sensor failure; impacts system control and efficiency. |
| E05 | Water Flow Temperature Sensor Fault | Flow temperature sensor fault; affects heating regulation. |
| E06 | Return Temperature Sensor Fault | Return sensor fault; may cause incorrect system modulation. |
| E07 | Domestic Hot Water Sensor Fault | Cylinder temperature sensor failure affecting hot water production. |
| E08 | Evaporator Coil Sensor Fault | Coil temperature sensor fault; impacts defrost and performance. |
| E09 | Condenser Temperature Sensor Fault | Heat exchanger sensor failure; affects system safety and control. |
| E10 | Water Flow Fault | Insufficient water circulation; likely pump failure, airlock, or blocked system. |
| E11 | Low Water Pressure Fault | System pressure too low; check filling loop, leaks, or expansion vessel. |
| E12 | High Water Temperature Fault | Water temperature exceeded safe limit; often due to poor circulation. |
| E13 | Defrost Fault | Defrost cycle failure; possible airflow restriction or sensor issue. |
| E14 | Communication Fault | Internal communication error between PCB or controller components. |
| E15 | Inverter / Compressor Drive Fault | Fault with inverter board controlling compressor operation. |
| E16 | Fan Motor Fault | Outdoor fan failure; may be electrical or mechanical. |
| E17 | Anti-Freeze Protection Active | System temperature too low; frost protection mode activated. |
| E18 | Refrigerant System Fault | General refrigerant circuit issue; requires system diagnostics. |
| E19 | Pressure Sensor Fault | Fault with system pressure sensor; may give incorrect readings. |
| E20 | EEPROM / Control Board Fault | Internal PCB memory or configuration fault. |
| E21 | Current Protection Fault | Electrical overcurrent detected; possible compressor or wiring issue. |
| E22 | Voltage Fault | Supply voltage outside acceptable range. |
| E23 | Pump Fault | Circulation pump failure or not operating correctly. |
| E24 | Flow Switch Fault | Flow switch not detecting movement; indicates circulation issue. |
| E25 | High Condensing Temperature | Condenser temperature too high; poor heat transfer or flow issue. |
| E26 | Low Evaporating Temperature | Evaporator temperature too low; possible airflow or refrigerant issue. |
| E27 | 4-Way Valve Fault | Reversing valve issue affecting heating/cooling mode switching. |
| E28 | Defrost Sensor Fault | Fault with defrost temperature sensor. |
| E29 | Discharge Sensor Fault | Compressor discharge sensor failure. |
| E30 | System Configuration Fault | Incorrect system setup or parameter configuration. |
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.
