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	User 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
E168	PCB lock out	May follow power supply problem - try reset

Fault codes that require an engineer or installer visit

Code	Possible fault	User 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

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 users 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.

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 required
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/ 50Hz
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 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 the user may be able to clear

Code	Possible Fault	User Action
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 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 call back to check circulation
E12	Boiler control	Engineer visit required
E13	High limit thermostat	Engineer visit required
E44	Parameter error	Installer call back to reset parameter(s)
E45	Parameter error	Installer call back to reset parameter(s)

 

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

Error code E168 could be telling you that a number of things are wrong with the boiler. Typically, this error code is reporting on one of four problem areas. The first two problems listed below are the most common, so we advise you to look for an issue here first.

1. The boiler has been reporting other codes previously

In this case, other error codes will have been displayed before code E168. The boiler will have detected a fault and displayed the error code relevant to the problem. The boiler will then have been reset, either automatically or by the user.

Once the boiler starts up again it may not be able to detect the original fault and so will display E168 as a replacement for the previous code.

The codes that can display prior to E168 are:

• E20 - Boiler temperature sensor fault
• E28 - Flue gas temperature sensor fault
• E50 - Domestic Hot Water temperature sensor fault
• E110 - Overheat (O/H) Thermostat operated - check to circulation and connections to O/H T/stat
• E119 - Water pressure switch cut out (low water pressure in boiler and system)
• E125 - Boiler max temperature exceeded - possible circulation fault
• E130 - Flue gas max temperature exceeded - check connections and flue NTC
• E131 - Power has been turned off during E125 or E130 faults. Check cause of E125 and E130
• E133 - Flame not established in time - checks to be made of gas supply, flue system, condensate discharge, spark generator, electrodes, leads and wiring harness connections
• E156 - Under voltage (lower than 195V) has been supplied to boiler
• E160 - Fan system fault

If any of these codes were seen before E168, fix the faults that were referenced by these error codes.

2. The mains supply to the boiler has been interrupted or is irregular

In this case, E168 means that the boiler has been experiencing a voltage either above or below the tolerance (+/- 10%) of the required 230V supply. This problem can be difficult to identify as irregularities may only occur at certain times. You can either test the mains supply yourself or call in a qualified electrician. If there is a fault, consult an electrical supplier for further advice on the issue.

3. A number of boiler components may not be operational or lack electrical integrity

If neither of the above solutions work, it's recommended that the following components be tested to make sure there are no faults or any signs that they have been affected by water spillage or internal leaks:

• Gas Valve
• Spark Igniter
• Electrodes (gap & connections)
• Pump
• Fan
• Wiring harness & connections
• Diverter Valve (cartridge sticking or motor issue)

Any of these parts could cause E168 to appear and aren't necessarily reported by an error code. If you find a fault, simply replace the part.

4. The PCB has developed an issue

Once every other solution has been tried, the likely conclusion is that the PCB is faulty and needs to be replaced. Replace the whole unit and test.

If you need any advice or assistance with this issue or any other, you can consult the heateam technical team on 0844 871 1545, who will be happy to help you diagnose the issue and find a solution as quickly as possible.

All fault codes are shown as E with number(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 a 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 an engineer to visit and investigate.