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A common misconception is that E1 is a single, distinct error code on a Baxi boiler. However, multiple error codes start with E1, each indicating a different issue affecting the system. These faults may include low water pressure, circulation blockages, or sensor malfunctions, each requiring specific troubleshooting steps for resolution.
Baxi boilers utilize a structured error code system, where codes beginning with E1 typically signify performance-impacting faults, such as:
Recognising these E1-related error codes allows homeowners to diagnose the root cause and determine if a quick fix (like repressurising) or professional intervention (such as replacing a faulty part) is necessary.
The table below provides an overview of E1-series error codes, their potential causes, recommended solutions, and approximate repair costs.
Error Code | Issue | Causes | Fixes | Cost |
E09 | Gas Valve Connection Fault | Loose/damaged gas valve connections, faulty wiring, PCB issues. | Inspect/tighten gas valve connections, replace wiring, replace gas valves. | £150-£600 |
E10 | External Probe Fault | Faulty/disconnected external temperature probe, wiring issues. | Check probe connection and wiring, replace probe. | £100-£200 |
E12 | Differential Water Flow Switch Fault (Still Open) | Blockage in heating system, faulty water flow switch. | Clear blockages, replace flow switches. | £150-£250 |
E13 | Differential Water Flow Switch Fault (Still Closed) | Flow switch stuck in closed position, electrical fault. | Test and replace flow switch, check wiring. | £150-£250 |
E15 | Gas Valve Command Fault | Boiler not receiving correct signals, faulty PCB or wiring. | Inspect/replace wiring, replace PCB or gas valve. | £150-£600 |
E20 | Central Heating NTC Sensor Fault (Short Circuit/Open Circuit) | Faulty NTC sensor, loose/broken wiring connections. | Check/secure wiring, replace NTC sensor. | £100-£250 |
E28 | Flue NTC Sensor Fault (Short Circuit/Open Circuit) | Faulty flue temperature sensor, damaged/disconnected wiring. | Inspect/reconnect wiring, replace flue sensor. | £150-£300 |
E40 | Return Central Heating NTC Sensor Fault (Short Circuit/Open Circuit) | Malfunctioning return heating sensor, wiring faults. | Reconnect or replace wiring, replace NTC sensor. | £100-£250 |
E50 | DHW NTC Sensor Fault (Tank Boiler) (Short Circuit/Open Circuit) | Faulty DHW sensor, damaged sensor wiring. | Inspect/replace DHW sensor, repair wiring. | £100-£250 |
E83 / E84 / E85 / E86 / E87 | No Communication | PCB communication failure. | Reset boiler, check PCB connections. | £150-£500 |
E103 | Safety Assist Battery Exhausted | Safety assist battery failure. | Replace safety assist battery. | £100-£200 |
E104 | Faulty Safety Assist PCB | Defective PCB. | Replace PCB. | £400-£600 |
E107 | PCBs Not Synchronised | PCB failure or communication error. | Reset boiler, replace PCB if necessary. | £400-£600 |
E109 | Precirculation Alarm | Pump failure, trapped air in system. | Check for airlocks, ensure pump operational. | £100-£300 |
E110 | Boiler Overheating | Pump jammed, air in system, safety thermostat tripped. | Release air from the system, check the pump. | £150-£400 |
E118 | Low Water Pressure (<0.5 bar) | Leak, recently bled radiators, expansion vessel issue. | Repressurise system, check for leaks. | Free-£250 |
E125 | Water Circulation Fault | Blocked pipes, faulty pump. | Clear blockages, test/replace pump. | £150-£400 |
E128 | Frequent Flame Loss | Faulty ignition system, sensor issue. | Clean/replace flame sensor, check ignition. | £100-£300 |
E129 | Frequent Flame Loss During Calibration | Incorrect ignition setting, gas pressure issue. | Reset boiler, adjust gas pressure. | £150-£300 |
E130 | Flue Thermostat Sensor Tripped | Overheating, blocked flue. | Check and clear the flue, reset the thermostat. | £150-£350 |
E133 | Gas Supply Fault | No gas supply, faulty electrodes. | Check gas supply, test spark electrode. | £100-£250 |
E134 | Gas Valve Open Without Gas | Faulty gas valve, short request period. | Replace gas valve. | £150-£300 |
E135 | Internal Boiler Error | Various internal faults. | Reset boiler, diagnose internal components. | £100-£500 |
E154 | Flow/Return Plausibility Test Failed | Temperature difference is too high. | Check system flow, inspect sensors. | £150-£400 |
E160 | Fan Fault | Fan failure, wiring issue. | Inspect/replace fan unit. | £200-£500 |
Most Baxi error codes indicate a specific fault with your boiler. Some issues can be resolved by resetting the boiler, checking for loose connections, or repressurising the system. However, persistent or safety-related errors require a Gas Safe registered engineer to diagnose and repair the issue.
To reset your Baxi boiler:
Locate the reset button on the boiler control panel.
Press and hold the button for a few seconds until the boiler restarts.
If the error code reappears after resetting, the fault may require professional attention.
The E118 error code means your boiler’s water pressure has dropped below 0.5 bar. This can be caused by a leak, recently bled radiators, or a problem with the expansion vessel. Try repressurising the system by using the filling loop—if the pressure keeps dropping, call an engineer to inspect for leaks or system faults.
If your Baxi boiler isn’t igniting and displaying an error such as E133 (Gas Supply Fault) or E09 (Gas Valve Connection Fault), possible causes include:
No gas supply (check if other gas appliances are working).
A faulty gas valve.
Issues with the ignition system.
In this case, you should call a Gas Safe engineer to inspect the boiler and gas connections.
The E110 error means the boiler has overheated, usually due to:
Air is trapped in the system.
A faulty pump.
A tripped safety thermostat.
Try bleeding your radiators to remove airlocks and check the system pressure. If the issue persists, an engineer will need to inspect the pump and thermostat.
A PCB (Printed Circuit Board) fault (e.g., E09, E15, E104, or E107) is a serious issue that affects the control of your boiler. Since the PCB is the boiler’s main control unit, DIY repairs are not recommended. If you see an error indicating a PCB fault, contact an engineer for diagnostics and possible replacement.
An E125 error suggests a problem with water circulation in your heating system, typically due to:
A blockage in the pipes or heat exchanger.
A faulty pump.
Try checking for obstructions or resetting the boiler. If the issue persists, a professional may need to clean the system or replace the pump.
The cost of repairs depends on the fault. Here are some average repair costs:
Gas valve replacement: £150 – £300
PCB replacement: £400 – £600
Pump replacement: £150 – £400
Sensor replacement: £100 – £250
You should contact an engineer if:
The boiler fails to ignite after resetting.
You smell gas (turn off the boiler and call the National Gas Emergency Service at 0800 111 999).
The boiler keeps shutting down or displaying the same error code repeatedly.
There are signs of water leaks or pressure drops in the system.
To reduce the risk of boiler faults:
Service your boiler annually to detect potential issues early.
Monitor water pressure and repressurise when needed.
Bleed radiators regularly to prevent airlocks.
Check for leaks in your heating system.
Ensure good ventilation around your boiler for optimal performance.
Baxi boilers are designed with a variety of E1-series error codes to help diagnose specific faults efficiently. These error codes provide valuable insight into potential issues, ranging from low water pressure and sensor malfunctions to circulation faults and overheating problems.
While some of these issues can be resolved with basic troubleshooting, such as repressurising the system, bleeding radiators, or checking for loose connections, others involve electrical components, gas supply faults, or internal boiler failures, which should only be handled by a Gas Safe registered engineer. Attempting to repair complex faults without professional expertise can not only cause further damage to the boiler but also pose potential safety risks.
If you’re experiencing persistent boiler problems or your system continues to display E1-series error codes despite resets and minor fixes, it’s crucial to seek professional help as soon as possible. Ignoring these issues can lead to higher repair costs, reduced energy efficiency, and even complete boiler failure, leaving you without heating or hot water when you need it most.
Regular boiler servicing and preventative maintenance can help minimize the risk of faults and extend the lifespan of your system. By addressing minor issues early and ensuring your boiler is operating efficiently, you can avoid unexpected breakdowns and costly emergency repairs.
For peace of mind and long-term reliability, always consult a qualified engineer for any ongoing boiler issues and consider annual servicing to keep your Baxi boiler running smoothly. 🚀
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