No Need to Panic – Understanding Baxi Boiler Fault Codes Just Got Simpler

If you have a Baxi boiler in Fareham, Gosport or the surrounding areas, you’re not alone – it’s a trusted name for heating systems across the UK. However, when a fault code suddenly appears on your boiler display, it can be worrying, especially during a cold snap.

That’s why we’ve put together this handy guide to help you decode every Baxi boiler fault code, sorted by model to make things easier. Whether you’re just curious or trying to troubleshoot a problem, you’ll find everything you need right here.

Of course, if you’d rather speak to a professional, our Gas Safe-registered engineers are Baxi specialists and happy to help. Please call us on 01329 285993 or email info@ghs.me.uk.

 

Baxi Platinum error codes

1. E20– This error code refers to the “Central heating NTC error” message, which suggests a problem with the central heating NTC (Negative Temperature Coefficient) sensor in your heating system. The NTC sensor is responsible for measuring temperature.
2. E28– This is caused by “Error with the NTC (Negative Temperature Coefficient) Flue, air pressure switch or blocked Flue or condensate”, which can be triggered by problems with temperature sensors, air pressure switches, or obstructions in the Flue or condensate drain.
3. E50 – The possible cause could be a “Hot water NTC (Negative Temperature Coefficient) error”. This indicates a problem with the NTC sensor, which is responsible for measuring the temperature of the hot water in your heating or hot water system. Regular boiler servicing will help deter issues like this.
4. E110 – This error code is triggered by the “Thermostat operated safety” feature, which typically refers to a safety mechanism in a heating or HVAC system controlled by a thermostat. The safety feature is designed to ensure the system operates within safe temperature ranges, preventing overheating or other potential hazards.
5. E119 – This error corresponds to the message “Water pressure switch error – not operated”. This indicates an issue with the water pressure switch in your heating or hot water system. The water pressure switch is responsible for detecting and regulating water pressure within the system.
6. E125 – This Baxi fault code means there’s an issue with the circulation of fluid or heat in the primary circuit of your heating system. This can affect the overall performance and efficiency of the system.
7. E130 – This is the “Flue NTC (Negative Temperature Coefficient) operation error” in your Baxi boiler. This refers to a problem with the NTC sensor in the fuel of your heating or HVAC system. This sensor is designed to measure temperature in the flue or exhaust gases.
8. E133 – This refers to the “Gas supply error or flame failure”, which indicates that your heating or combustion system has encountered an issue related to the gas supply, which can lead to a flame failure. This is a safety mechanism to prevent potentially hazardous situations.
9. E160 – This is a “Fan or fan wiring error” in your heating or HVAC system. The fan plays a crucial role in circulating air and maintaining system efficiency.
10. E193 – This error code means there is a “Pre-circulation error” in your Baxi boiler. The pre-circulation system is responsible for circulating fluids, such as water or coolant, before the commencement of central heating or cooling operations.

Baxi EcoBlue error codes

11. 110 – The error message equivalent to this code is “Overheated – try bleeding your radiators”. This means that your heating system may be overheating due to trapped air in the radiators.
12. 117, 118, and E78– These error codes all correspond to water pressure issues. 117 and 118 refer to “Water pressure too high” and “Water pressure too low” respectively. And E78 refers to the “Water pressure sensor fault”. It is advisable to seek professional help to tackle these issues.
13. 125 and E109 – These error codes refer to circulation errors in your boiler. 125 means there’s a “Water circulation fault”, and E109 refers to a “Poor circulation” in your heating system.
14. 128 and 133 – If your boiler is experiencing flame-related issues, you should receive one of these codes. 128 refers to “Loss of flame during operation”, and 133 means there’s the “Safety time to establish flame exceeded” fault in your boiler. It is advisable to have a boiler engineer inspect your heating system as soon as possible.
15. E10 – This Baxi fault code refers to the “Outdoor sensor error”, which suggests a problem with the outdoor sensor in your heating or HVAC system. This sensor is typically responsible for measuring outdoor temperature or other environmental conditions.
16. E20 – This code is triggered by a “Central heating thermistor sensor fault” in your boiler. A thermistor is a type of temperature sensor.
17. E28 – This code refers to the “Flue thermistor fault”, which suggests an issue with the thermistor sensor in the Flue of your heating or HVAC system.
18. E54 – E54 or “Domestic hot water (DHW) flow sensor fault” indicates a problem with the flow sensor responsible for measuring the domestic hot water flow in your heating or hot water system.
19. E100 – This error code means “Internal clock time error on printed circuit board (PCB)”. The internal clock is used for timing and scheduling functions in the system.
20. 111 – This error may be caused by the “Maximum limit of flow temperature” issue in your Baxi boiler system. It’s a safety feature to prevent the system from producing excessively hot air or water, which could lead to system damage, energy inefficiency, or even safety hazards.
21. 119 – This error code is displayed when the system pressure is too low.
22. 127 – This fault code corresponds to the “Legionella (cause of Legionnaires’ disease) protection temperature not reached” issue. Legionella bacteria can proliferate in warm water systems, posing a risk of Legionnaires’ disease.
23. 153 – 153 or “Forced reset unit unlocked” error suggests that a forced reset of your heating or HVAC unit has been performed, and the unit is now unlocked. A forced reset is typically a procedure to clear error codes or issues and restore regular operation.
24. 160 – This indicates there’s some fault in the fan. Calling in an engineer to repair the system is advisable.
25. 162 and 166– Both these codes refer to an error with your boiler’s air pressure switch. Regular maintenance and servicing are helpful measures to prevent these issues. At The GHS Group, we offer 24/7 services, so feel free to call us for any repair work related to your Baxi boiler.
26. 164 – This code has two different meanings based on your geographic location. “Pressure Sensor Error (UK) – Heating flow switch error (Ireland)”.
27. 270 – This code means there’s a “Dry fire” issue in your boiler system. This typically refers to a situation where a heating or combustion system operates without the presence of fuel or water, which is essential for its proper operation. Dry firing can be a potentially damaging condition for the system and should be avoided.
28. 432 – 432 or “Earth connector error” suggests that there’s a problem with the electrical grounding of your heating or HVAC system. Proper electrical grounding is essential for safety and system reliability. Call in a registered engineer as soon as possible.
29. 433 – This error code refers to the error message “Heat exchanger temperature exceeded (greater than 95 degrees)”.

EcoBlue Advance / Ecoblue Regular Gas Boiler flashing light fault codes

30. Green flashes – One green flash indicates that the boiler temperature has been reached and requires no further action. Three green flashes mean “Temporary flame loss. Boiler will self-reset. If the fault continues, you will see three red flashes”. Four green flashes refer to the message “Communication error between printed circuit board (PCB) and control. Temporary error, will self-reset”. Five flashes are an indication of “Parameter error on printed circuit board (PCB). Temporary error, will self-reset”. Finally, six green flashes mean it’s a “Miscellaneous error. Temporary error, will self-reset”.
31. Red flashes– 1 red flash refers to a “Sensor error, temperature fault or flow fault”. 2 flashes will mean that you have the “Boiler overheat tripped” situation in place. Three red flashes indicate the “Ignition fault. Boiler has attempted to light 5 times and failed”. When there are four red flashes, there’s a fault in the fan. 5 flashes indicate the “Parameter storage unit (PSU) error”, and six flashes mean “Miscellaneous error” in your heating system.

Do not ignore the red flashes; call in a professional and trustworthy engineer right away. The green flashes may be an indication that your heating system needs servicing.

Baxi Duo-tec/Megaflo error codes

32. E10 – This code refers to the “Outdoor sensor fault”.
33. E20 – This Baxi error code means there’s a “Central heating thermistor sensor error” in your boiler model.
34. E28 – This code is triggered by the “Fluee thermistor error”.
35. E110 – This code indicates a boiler overheat error.
36. E119 – You’ll most likely see this error code when there’s a low water pressure error.
37. E125 and E193– These errors correspond to circulation errors in your boiler model. E125 indicates explicitly an issue with the primary water circulation.
38. E131 – This code refers to the “Flue overheat lockout error”.
39. E133 – When there’s an ignition error in your boiler, you’ll most likely see this code.
40. E160 and E161– Both these codes suggest a fault with your Baxi model’s fan.
41. E164 – This code indicates an issue with the pressure sensor fault.
42. E167 and E168 – E167 refers to a “Printed circuit board (PCB) error” and E168 refers to a “Printed circuit board (PCB) lockout error”. This suggests that the printed circuit board (PCB) in your heating or HVAC system has entered a lockout state due to a fault or safety concern. This lockout prevents the system from operating to avoid further issues.

Baxi 200 / 400 Combi Gas Boiler error codes

43. 01 – .00 – This code refers to the cause “Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve”.
44. 01 – .05– The reason behind this code could be that the “Difference between the flow and return temperature is too high, sensor error or insufficient circulation”.
45. 01 – .08– This code suggests that the problem is with a “Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation”.
46. 01 – .14 – The message corresponding to this code is “Maximum flow temperature value exceeded or insufficient circulation – temporary fault”.
47. 01 – .18 – This issue is caused by “No water circulation, insufficient circulation or sensor error”.
48. 01 – .21 – This Baxi fault code refers to a “Temporary error – flow temperature increasing too fast in domestic hot water (DHW) mode, insufficient circulation or sensor error”.
49. 02 – .02– The possible cause could be “Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured”.
50. 02 – .03– The reason behind this error code could be a “Temporary error- incorrect configuration settings C1/C2″.
51. 02 – .04– This can also be a “Temporary error- parameter fault. Incorrect parameters”.
52. 02 – .06– This could be a temporary error caused by system water pressure, water leak on the boiler, or water leak on the system.
53. 03 -.00– The possible cause is “Temporary error with communication, negative temperature coefficient thermostat (NTC) or Flue sensor. Sensor could also be unconnected or have a bad connection”.
54. 03 – .01– There could be a communication error with the printed circuit board (PCB).
55. 03 – .02– This may be caused by a “Flame error – no flame during operation”.
56. 00 – .04– The possible cause of this error is “Return temperature sensor open-circuit. Sensor not or badly connected”.
57. 00 – .05– This may be caused by the return temperature sensor short-circuit. The sensor may not be connected or may be poorly connected.
58. 01 – .02– The possible cause is “Temperature measured by return sensor greater than flow sensor”.
59. 01 – .04– This may arise because of “Loss of flame detected 5 times in 24 hours (with burner on)”.
60. 01 – .11– This code may be triggered due to “Incorrect fan speed – external draught over the boiler or defective gas/air unit”.
61. 01 – .12– This can be an indication of the fact that your boiler “Requires reset – temperature measured by return sensor greater than flow temperature”.
62. 01 – .17– Reset the boiler. There’s no circulation. Sensor fault, either not connected or has a bad connection.
63. 01 – .20 – The code refers to the “Maximum Fluee gas temperature reached. No circulation or sensor fault”. Issue.
64. 02 – .00– The reset button has been pressed.
65. 02 – .07– No or low system water pressure. System pressure is less than 0.5 bar.
66. 02 – .16– Permanent fault, caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage.
67. 02 – .17– Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit.
68. 02 – .19– Jumper 1 changed – check position of jumper 1. Jumpers are small connectors that can be placed on pins or connectors on a circuit board to change or configure specific settings.
69. 02 – .20– Jumper 2 changed – check position of jumper 2.
70. 02 – .21– Jumper 3 changed – check position of jumper 3.
71. 02 – .47– This refers to the “Wiring to external device error”
72. 02 – .48– Configuration to external device unsuccessful – check pairing to external device.
73. 04 – .00– The problem could be with the gas valve.
74. 04 – .01– Flow temperature sensor short-circuited. Sensor not connected or poorly connected, faulty connection or sensor issue.
75. 04 – .02– Permanent fault. The flow temperature sensor is open-circuited, the sensor is not connected correctly, or there is a bad connection or sensor fault.
76. 04 – .03– Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation.
77. 04 – .04 and E.04 – .05– Permanent fault. The Fluee temperature sensor is short-circuited, the sensor is not connected correctly, or there is a faulty connection or sensor.
78. 04 – .06– Permanent fault. Critical Flue gas temperature value reached, no circulation or sensor fault.
79. 04 – .08– Permanent fault. Maximum safe temperature value reached; safety thermostat open-circuited, resulting in no circulation. Sensor not correctly connected, or faulty connection or sensor.
80. 04 – .10– Failure to light (this could be a gas supply issue).
81. 04 – .12– Permanent fault. False flame signal, short-term Fluctuation of the mains, ionisation current present even though there is no flame; the burner remains very hot (CO2 too high) or a defective gas/air unit.
82. 04 – .13– Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged.
83. 04 – .17– Permanent fault. Problem with gas valve or defective gas/air unit.

These error codes and corresponding messages are heavily technical terms that can be efficiently assessed and addressed by experienced boiler engineers. Do not panic when you encounter one of these. Contact us right away, and one of our experts will be your guide.

Baxi 600 Combi Gas Boiler error codes

84. E09 and E15– Both these codes refer to gas valve problems in your Baxi boiler. E09 may be caused by a problem with the gas valve connection cable, and E15 could arise due to a fault in the gas valve command.
85. E10 – This may be caused by “External probe fault”.
86. E12 and E13 – The codes refer to the issues “Differential water flow switch fault (still open)” and “Differential water flow switch fault (still closed)”, respectively.
87. E20– The possible cause could be a “Central heating negative temperature coefficient (NTC) thermostat fault.
88. E28 – This may be caused by “Fluue negative temperature coefficient (NTC) thermostat fault”.
89. E40 – This code refers to the “Central heating return negative temperature coefficient (NTC) thermostat fault”
90. E50 – The possible cause may be “Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.)”.
91. E83/E84/E85/E86/E87– When there’s no communication, one of these codes will be displayed.
92. E109 – Pre-circulation fault.
93. E110 – Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit. The boiler’s maximum temperature was exceeded due to overheating (likely due to a probable pump jam or air in the circuit). Safety thermostat sensor tripped.
94. E118 – Primary system water pressure is too low (< 0.5 bar).
95. E125 and E270– E125 refers to a circulation fault (primary), and E270 refers to a circulation fault (dry fire).
96. E128 – This refers to frequent flame failure (12 times).
97. E129 – Safety error for frequent loss of flame with max correction during the ignition during the Calibration Function.
98. E130 – Fluue thermostat sensor tripped (lockout).
99. E133 – Failure to light (could be a gas supply issue).
100. E134 – Elapsed time gas valve open without gas (short request in a short period).
101. E135 – Interruption of gas supply (internal error).
102. E154 – Flow/return sensor temperature test.
103. E160 – Fan or fan wiring fault.
104. E163 – Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.).
105. E317 – Wrong power supply electrical frequency (Hz).
106. E321 – Hot water negative temperature coefficient (NTC) fault.
107. E384 – This could be a false flame error.
108. E385 – Under voltage.
109. E430 – Water pressure temporary test.
110. E430 + Flame ‘crossed’– Water pressure test failed.

Baxi MainEco error codes

111. Green flashes – 1 green flash means “Boiler temperature reached – no action required”. Three green flashes refer to the error “Temporary flame loss – this is a temporary error; the system should reset on its own”. 4 flashes refer to “Communication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own”. Similarly, five flashes mean “Parameter error on parameter storage unit (PSU) or printed circuit board (PCB) – this is a temporary error, the system should reset on its own”. Finally, six flashes indicate a miscellaneous error.
112. Red flashes– 1 red flash is given when there is a “Sensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on its own”. 2 flashes are shown for the “Boiler overheat tripped” error. Three red flashes are triggered when there is “Ignition fault. Boiler has attempted to light 5 times and failed”. Flashes 4 and 5 indicate fan fault and parameter storage unit (PSU) error, respectively. Flash 6 indicates miscellaneous mistakes.

Baxi Avanta Range error codes

113. E0 – This code refers to the “Temperature sensor fault”.
114. E1 – This code corresponds to the error message “Overheated – try bleeding your radiators”.
115. E2 – This code is triggered due to “Poor circulation – try bleeding your radiators”.
116. E3 and E12– Both these codes refer to printed circuit board (PCB) faults.
117. E4 – This may be caused by “Ignition failure – try bleeding your radiators”.
118. E10 – This Baxi code refers to poor or no circulation.
119. E13 – This refers to the message “Heat exchanger thermal fuse tripped”.
120. E83 / 84 / 85 / 86 / 87– This corresponds to the message “Fan fault normally E8”, which suggests that a fault or error related to the fan in your heating or HVAC system has occurred. The “E8” is likely an error code associated with the specific type of fan fault.

Baxi GA Range error codes

121. E53 – Poor combustion, the Flue terminal may be blocked.
122. E110 and E125– The system is overheating; try bleeding your radiators.
123. E117 – System water pressure is high, try bleeding water from your radiators.
124. E118 – System water pressure is low.
125. E133 – This could be due to a gas supply fault.
126. E4 – This may be caused by ignition failure.
127. E09 – This has likely occurred due to a gas valve wiring fault.
128. E10 – This code refers to “Outdoor sensor error”.
129. E15 – This code is triggered because of a “Gas valve connection fault”.
130. E20 – Central heating thermistor sensor fault.
131. E28 – Fluue thermistor fault.
132. E40 – Central heating return thermistor fault.
133. E53 – Fluee obstruction may cause this error.
134. E55 – This code may be triggered when calibration is required.
135. E78 – This code refers to the water pressure sensor fault.
136. E92 – Combustion test alarm during auto-setting.
137. E109 – The possible cause could be poor circulation.
138. E128 and E129– Loss of flame during operation and Loss of flame during calibration, respectively.
139. E135 – This may be an indication of an internal error.
140. E154 – Primary flow fault.
141. E160 – A fan fault may cause this.
142. E270 – The possible cause could be dry fire.
143. E317 – Wrong power supply (Hz).
144. E321 – Not water thermistor fault.
145. E384 – Flame detected when gas valve is off.
146. E385 – Low voltage (less than 195V).

Baxi Solo error codes

147. FLASH FLASH ON– This can be a fan error.
148. FLASH OFF FLASH– When the voltage is less than 180V.
149. FLASH OFF ON– It refers to the overheat lockout.
150. FLASH ON FLASH, FLASH ON ON, and ON ON FLASH– These codes should be about a printed circuit board (PCB) error.
151. OFF OFF OFF– There’s no power.
152. ON FLASH FLASH– Circulation error or dry fire.
153. ON FLASH ON– Thermistor error.
154. ON OFF FLASH– Live and neutral reversed error.
155. ON OFF ON – This may refer to an ignition error.
156. ON ON ON– Low voltage wiring harness error.

 

Time to Take the Safe Step Forward

Now that you’ve got a better understanding of your Baxi boiler’s fault codes, you’re one step closer to solving the issue. However, remember that while DIY fixes may seem tempting, safety should always be your top priority.

If you’re unsure or the problem persists, don’t risk it. Let our experienced, Gas Safe-registered engineers take a look. We know Baxi boilers inside and out and can get your heating back on track quickly and safely.

Call us today on 01329 285993 or email info@ghs.me.uk – we’re here to help.

 

At The GHS Group, we are a team of Gas Safe-registered engineers with over 40 years of combined experience. We possess the knowledge and expertise necessary to comprehend your Baxi boiler’s error codes. And we can efficiently fix them. We also offer 24/7 boiler repair services, so you can always rely on us, regardless of the issue. Contact us to discuss your Baxi boiler issues now.

Time to Take the Safe Step Forward

Now that you’ve got a better understanding of your Baxi boiler’s fault codes, you’re one step closer to solving the issue. However, remember that while DIY fixes may seem tempting, safety should always be your top priority.

At The GHS Group, we’re proud to be a third-generation family-run business, built on trust, reliability, and expert knowledge. Our team of Gas Safe-registered engineers boasts over 40 years of combined experience, giving us the confidence to quickly diagnose and resolve any Baxi boiler issue you may encounter.

With our 24/7 boiler repair service, help is always nearby. Whether it’s a minor fault or a complete system breakdown, you can count on us to get things running smoothly again.

Call us today on 01329 285993 or email info@ghs.me.uk – we’re always here to help.