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Baxi boiler got an error/fault code? What they are and how to fix them

Heating Advice

Learn about common Baxi problems & fault codes [applicable to Baxi 100, 200, 300, 400 & 600 combi, Baxi Duo-tec and EcoBlue combi] [2018]

Most modern combi boilers run smoothly without ever causing you much grief and maintenance and Baxi in particular have a growing reputation for quality and value. There are rare instances though, where problems will arise and the below should give you a quick idea of what to expect if your Baxi is giving you a rare problem.

Prior to calling out a heating engineer though or rushing out to buy a new boiler, you should consider two things:

1. Is it covered under the Baxi warranty?

All new Baxi boilers come with at the very least, a 2-year warranty with warranties up to a whopping 10-years available when they're installed by a Baxi accredited installer. You should check the paperwork you received upon install or check your emails for details of this warranty, there's a good chance you'll still be covered and if you can't solve the problem with a simple reset - Baxi will send out an engineer at no charge.

Don't forget that you'll need to have kept up your annual services in order to keep your warranty valid - your boiler warranty paperwork will detail this.

The below mentioned fault codes are largely errors with the boiler unit itself which means that if you're still covered by your warranty and had the boiler serviced annually, you should be covered for all these faults.

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2. The old off and on again trick - try resetting your Baxi first

Occasionally your boiler will display fault codes in error or because it very briefly detected an issue that didn't materialise. When it does this, the fault code will remain until it no longer detects the problem. Sometimes though, it will require a bit of a nudge to detect this and restarting the boiler can be the wake up call it needs to realise that actually, everything is alright.

Most Baxi boilers have a simple reset button on the front panel - locate this and press and hold the button for 1 to 3 seconds or until it's clear that the boiler has rebooted itself.

Baxi problems & fault codes [applicable to Baxi 100, 200, 300, 400 & 600 combi, Baxi Duo-tec and EcoBlue combi] [2018]

Fault code Source of error Heating engineer required initially? Potential repair cost range inc. labour
E09 Gas valve connection cable No - Baxi recommend initial reset before calling engineer N/A
E15 Gas valve fault No - Baxi recommend initial reset before calling engineer N/A
E20 Central heating NTC *Negative Temperature Coefficient fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £200-£300
E28 Flue fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £150-£300
E40 Central heating return fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £60-£100
E55 Calibration required Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £60-£100
E109 Pre-circulation fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £100-£200
E110 Safety thermostat operated No - Baxi recommend initial reset before calling engineer N/A
E117 Water pressure too high No - manually alter pressure gauge first £50-£100
E118 Water pressure too low No - manually alter pressure gauge first £50-£100
E125 Circulation fault (primary) No - Baxi recommend initial reset before calling engineer N/A
E128 Flame failure No - Baxi recommend initial reset before calling engineer N/A
E130 Flue NCS operated Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £50-£100
E133 Gas supply interrupted or flame ignite failure No - Baxi recommend initial reset before calling engineer N/A
E134 Gas valve open without gas - time elapsed No - Baxi recommend initial reset before calling engineer N/A
E135 Interruption of gas supply No - Baxi recommend initial reset before calling engineer N/A
E154 Flow/return sensor temperature test Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £50-£100
E160 Fan fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £150-£200
E270 Circulation fault (dry fire) Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £100-£150
E321 Hot water NTC fault Yes - contact Baxi (if under warranty/Gas Safe engineer if not) £200-300
E384 False flame No - Baxi recommend initial reset before calling engineer N/A

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