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Error codes

Error codeError codes are shown on our boilers to indicate that the product has an issue. There are different codes to indicate different categories of issues.

The most common error codes are explained below.

If your boiler is displaying an error code which isn't described below, please contact Baxi Customer Support, who will be able to help.

  • E168
  • GA range
  • HE A range
  • Avanta range
  • EcoBlue

About error code E168

If you are an installer looking for information please visit our installer advice page.

What does error code E168 mean?

Error code E168 is displayed when the boiler has detected a problem but can't work out exactly what it is. This can happen if the boiler has reset after developing a fault or if there has been an issue externally which affects the boiler, such as a fault with the electrical supply.

If the boiler has reset, it may have been displaying a different error code before showing E168. Making a note of any error codes you see will be extremely helpful to any installer trying to rectify the issue.

Will this code appear on my boiler?

The boilers that could report an E168 error are:

• Baxi Duo-tec Combi HE
• Baxi Duo-tec Combi HE A
• Baxi Megaflo System HE
• Baxi Megaflo System HE A
• Baxi Platinum Combi HE
• Baxi Platinum Combi HE A

When is this code likely to appear?

Commonly, E168 appears for one of the following two reasons:

1. The boiler has detected a problem and has then been reset

Sometimes when error code E168 is displayed, the boiler will have been reporting one of the following error codes beforehand: E20, E28, E50, E110, E119, E125, E130, E131, E133, E156, E160

These error codes all reference specific problems with the boiler and can be fixed with relative ease by a Gas Safe registered engineer. In this situation, E168 appears because the boiler has reset. This is triggered either by a person using the boiler controls or by a computer programme automatically running in the boiler system. A reset makes the boiler forget that it has a problem until it tries and fails to start up. Sometimes, when this happens, the boiler then can't detect the exact problem as it did before, so it displays E168. See below for more detail about what you should do if E168 is displayed.

2. The electricity supply to the boiler has been interrupted

Boilers need a constant, reliable and regular supply of mains electricity to work properly. If this isn't available or becomes interrupted, then the boiler is likely to fail. When this happens, E168 appears because the boiler detects that it isn't working properly but is not able to detect any faulty parts, as there aren't any.

What should I do if an error code such as E168 appears on my boiler?
If your boiler is displaying an error code, it needs attention. As a result, it's recommended that you call your local Gas Safe registered installer to come out and take a look. If you can, call the installer who originally fitted your boiler, as they should already be familiar with the workings of your central heating system.

To find a local installer, use our 'Find an Installer' tool.

Baxi Customer Support can also help. Call 0843 770 6356 or complete this form.

All fault codes are shown as E with numbers(s) following.

 

If the code does not have an E prefix it is not a fault, it is an operating status code, boiler on/off or temperature etc. In these cases the user guide should be consulted.

 

In all cases the user should try to reset the boiler first; power cuts etc. can affect the normal boiler operation. 

 

Fault codes the user may be able to clear 

Code Possible fault   User action
 E53  Poor combustion  Check flue terminal is not obstructed
 E110  Overheat  Check radiators are bled
 E117  System water pressure high  Bleed water from radiators
 E118  System water pressure low  Add water via filling loop
 E125  Overheat  Check radiators are bled
 E133  Gas supply fault Check gas is turned on, if prepayment meter check there is credit. If all ok and E133 persists - contact Engineer to visit & investigate

 

Fault codes requiring an engineer or installer visit

Code Possible fault   User action
 E09 Gas valve wiring Engineer visit required
 E10 External sensor fault Engineer visit required
 E12 Flow switch stuck open Engineer visit required
 E13 Flow switch stuck closed Engineer visit required
 E15 Gas valve/wiring/pcb fault Engineer visit required
 E18

Auto water refill on

Should clear, if not engineer visit
 E19 Auto refill on too long

Installer to check system for water leaks

 E20 Heating flow sensor fault Engineer visit required
 E28 Flue sensor fault Engineer visit required
 E40 Heating return sensor fault Engineer visit required
 E55 PCB requires calibrating Installer to recalibrate boiler
 E71 Fan parameter out of range Engineer visit required
 E72 Combustion test out of range Installer to check calibration
 E77 Flame sensing problem Engineer visit required
 E78 Minimum gas valve current Engineer visit required
 E79 Maximum gas valve current Engineer visit required
 E83/84/85/86/87 External wireless control communication Installer to reprogramme external control
 E92 Combustion test failure Installer to check flue and terminal
 E109 Water circulation Installer to check system for air and no circulation
 E128 Loss of flame sensing Installer to check electrodes, flue and recalibrate boiler
 E129 Loss of flame sensing  Installer to check electrodes, flue and recalibrate boiler
 E130 Flue overheat thermostat Installer to check system circulation
 E134 No gas when valve opens Installer to check gas supply
 E135 PCB error Engineer visit required
 E154 Circulation fault Installer to check for poor circulation
 E160 Fan fault Engineer visit required
 E270 Overheat/no circulation Installer to check for poor circulation
 E317 Power supply frequency Installer to check main power supply is 240v/ 50 Hz
 E321 Hot water sensor Engineer visit required
 E384 Flame sensing error Engineer visit required
 E385 Low voltage Installer to check mains voltage
 E430 Water pressure Installer to check circulation 
 E431  Heat exchanger sensor Engineer visit required

 

 

 

Fault codes on these boilers are shown as alternative flashing E or E1 and then two other numbers.

If the code has an A prefix this is a PCB programming code and should not be seen; this is usually due to a power supply fluctuation and resetting the boiler should clear it.

If the code is 0 or another number without a letter prefix, these are normal operating status codes. See user guide.

In all cases the user should try resetting the boiler before a call is arranged. 

Fault codes the end user may be able to clear

Code 

Possible fault 

Action 

 E110

 Overheat

 Ensure radiators are bled of air

 E119

 Low water pressure

 Add water to the system via filling loop

 E125

 Overheat

 Ensure radiators are bled of air

 E131

 Overheat lock out

 This may follow a power cut, try reset

 E133

 Gas supply fault

Check gas is turned on, if prepayment meter check there is credit. If all ok and E133 persists - contact Engineer to visit & investigate

 E168

 PCB lock out

 May follow power supply problem; try reset

 

Fault codes that may require an engineer or installer visit

 Code Possible fault  Action 
 E10  Outside sensor  Engineer visit required
 E20  Temperature sensor fault  Engineer visit required
 E28  Flue sensor error  Engineer visit required
 E151  PCB error  Engineer visit required
 E152  PCB error  Engineer visit required
 E155  Controls error  Engineer visit required
 E160  Fan speed error, too slow  Engineer visit required
 E161  Fan speed error, too fast  Engineer visit required
 E164  PCB error  Engineer visit required
 E167  PCB error  Engineer visit required

 

Fault codes on Baxi Avanta products are shown as E with following number(s).

  

If the code does not have an E prefix it is probably a normal operating code either temperature or boiler off etc;in these cases the user should consult the user guide. In all cases the user should try to reset the boiler first. Power cuts etc. can affect the boiler. 

 

Fault codes that the end user may be able to clear

 Code Possible fault   User actions
 E1  Overheat  Bleed radiators, check system water pressure; if low refill via filling loop
 E2  Circulation  Bleed radiators, check system water pressure; if low refill via filling loop
 E4  Ignition failure  Ensure gas supply is turned on. If meter is a prepayment type ensure there is credit
 E7  Poor circulation  Bleed radiators, check system water pressure; if low refill via filling loop

 

Fault codes requiring an engineer or installer visit

 Code Possible fault   Action
 E0  Temperature sensor  Engineer visit required
 E3  Boiler control  Engineer visit required
 E5  Flame not sensed  Engineer visit required
 E6  Boiler control  Engineer visit required
 E8  Fan fault  Engineer visit required
 E10  Poor/No circulation  Installer to call back to check circulation
 E12  Boiler control  Engineer visit required
 E13  High limit thermostat  Engineer visit required
 E44  Parameter error  Installer to call back to reset parameter(s)
 E45  Parameter error  Installer to call back to reset parameter(s)

 

 

 

All fault codes are shown as E with numbers(s) following.

 

If the code does not have an E prefix it is not a fault, it is an operating status code, boiler on/off or temperature etc. In these cases the user guide should be consulted.

 

In all cases the user should try to reset the boiler first; power cuts etc. can affect the normal boiler operation. 

 

Fault codes that the end user may be able to clear

Code  Possible Fault  User Action  
110  Overheat  Check radiators are bled 
117 Water pressure too high   Bleed water from radiators 
118  Water pressure too low  Add water via filling loop  
125  Water circulation fault  Bleed radiators, check system water pressure and refill via filling loop if low  
133  Safety time to establish flame exceeded  Check gas is turned on, if prepayment meter check there is credit. If all ok and this fault persists - contact engineer to visit and investigate 
 

 

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