Baxi E.02-.20 Fault Code: Causes, Fixes & Repair Costs
What does the Baxi E.02-.20 fault code mean?
The E.02-.20 code appears on Baxi boilers when the control board (PCB) detects that configuration Jumper 2 has been moved, displaced, or is sitting in the wrong position. Jumpers are tiny physical connectors fitted across pairs of pins on the circuit board — they act like miniature switches that tell the boiler how it has been set up for a particular installation. When the PCB notices Jumper 2 is not where it expects it to be, it locks out and displays this code rather than operating in a potentially incorrect configuration. It is worth being clear about two codes that often get confused online. E.02-.20 (with the dot sub-code) is a PCB jumper configuration fault — this page. 'E20' without the dot is sometimes used on older or different Baxi model ranges to indicate an NTC temperature sensor fault; that is a separate issue entirely. For context, E.02-.20 sits within the wider E.02 sub-code family: E.02-.00 means the reset button has been pressed; E.02-.07 indicates low or no system water pressure; E.02-.16 flags a permanent PCB or CSU fault; E.02-.17 points to a communication loss between the gas valve and PCB; E.02-.19 means Jumper 1 has changed position; and E.02-.20 means Jumper 2 has changed position. Each sub-code pinpoints a specific condition on the same control board.
General guidance only — not a substitute for professional advice. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Jumper displaced by boiler vibration over time Common
Boilers produce low-level vibration during normal operation and this can very gradually work small components loose. Jumper 2 can slowly shift off its pins over months or years without any human intervention, eventually triggering this fault code.
- Jumper accidentally moved during a previous service or repair Common
Any work that involves handling or removing the PCB — such as a fan replacement, heat exchanger service, or wiring inspection — risks nudging jumper positions. If an engineer did not specifically check Jumper 2 was still correctly seated after the work, this fault can appear later.
- Incorrect configuration at the time of original installation Sometimes
During commissioning the installer may have placed Jumper 2 in the wrong position for the specific model variant or application. The boiler may have operated briefly before locking out, or the error may have been present since day one.
- Physical PCB damage or corrosion at the jumper pins Rare
If moisture has entered the boiler casing, or if the PCB has suffered any physical damage, the jumper pins themselves can corrode or become damaged. In this scenario simply repositioning the jumper will not resolve the fault and a PCB replacement may be necessary.
How to fix it
- Check the rest of the boiler is behaving normally before assuming the fault is solely the jumper DIY safe
Look for any other warning signs — unusual noises, water leaks, or pressure outside the normal 1–1.5 bar range. Note down the exact code displayed, including the full sub-code (E.02-.20), to pass on to an engineer. This information helps them prepare the correct parts or documentation before arriving.
- Attempt a single boiler reset DIY safe
On most Baxi models, turn the mode selector to the R (Reset) position and hold it for at least five seconds before releasing. If the boiler fires up normally and the code does not return within a short period, monitor it closely. Do not reset more than two or three times in total — repeated resets without identifying the root cause can mask the problem or cause further issues.
- Do not remove the boiler casing or attempt to reposition the jumper yourself Gas Safe engineer
Accessing Jumper 2 requires opening the boiler casing and handling the PCB and associated wiring. This is not a task that falls within safe DIY limits. Incorrect handling risks electric shock, accidental damage to the PCB, and could invalidate any remaining warranty. Leave this step entirely to a qualified engineer.
- Call a Gas Safe registered engineer to inspect and re-seat Jumper 2 Gas Safe engineer
An engineer will open the casing, locate Jumper 2 on the PCB, and refer to the installation manual for your specific Baxi model to confirm the correct pin position. They will re-seat or replace the jumper as needed, then reset the boiler and confirm the fault has cleared. If the pins are corroded or the PCB is damaged, a board replacement will be required instead.
Parts you may need
- PCB jumper / configuration link (replacement) · from £5
- Baxi PCB (full replacement, if board is damaged) · from £180
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £80–£250, depending on the underlying cause.
Frequently asked questions
Is E.02-.20 the same as the Baxi E20 fault code?
No, they are different faults. E.02-.20 (with the dot and sub-code) specifically means the PCB has detected that configuration Jumper 2 is in the wrong position. 'E20' without the dot notation appears on some older or different Baxi model ranges and typically refers to an NTC thermistor or temperature sensor fault. If your display shows the full E.02-.20 format, you have a jumper configuration issue. If you see simply 'E20', check your model's manual to confirm which definition applies to your specific boiler.
How much should I expect to pay to fix E.02-.20?
Because this is usually a configuration issue rather than a major component failure, costs tend to be at the lower end of boiler repair pricing. Most people pay somewhere between £80 and £250, which covers the engineer's call-out, labour to access and reposition the jumper, and a reset. If the PCB has been physically damaged and needs replacing, costs can rise to £300–£500 or more — but this is not the typical outcome for a straightforward jumper fault.
Why did this fault appear after my boiler was recently serviced?
This is one of the more common triggers for E.02-.20. Any time an engineer handles the PCB — for example during a fan replacement, heat exchanger clean, or wiring inspection — there is a small chance Jumper 2 gets nudged out of position. Contact the engineer who carried out the work and explain the fault code; a reputable engineer will return to check their work, often at no additional charge.
Can I prevent this fault from happening again?
The best prevention is an annual boiler service with a Gas Safe registered engineer who follows Baxi's servicing guidelines and checks that all PCB jumpers are correctly positioned after any work. Ensure any engineer you use is Gas Safe registered — you can verify this on the Gas Safe Register website. Keeping up with annual services is also typically a requirement for maintaining a Baxi extended warranty.