Baxi E134 Fault Code: Causes, Fixes & Repair Costs
What does the Baxi E134 fault code mean?
The E134 code appears when the boiler's control board signals the gas valve to open and allow gas into the burner, but no gas flow is detected — and this happens repeatedly within a short window of time. Because the boiler cannot confirm gas is actually reaching the burner, it locks out as a safety precaution rather than continuing to attempt ignition. This is fundamentally a gas supply or gas valve fault, and the boiler will not resume normal operation until the underlying cause is resolved.
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
- Interrupted gas supply to the property Common
If the gas supply has been temporarily cut off — due to street works, a meter fault, or insufficient credit on a prepayment meter — the boiler will open the valve and find nothing to burn. This is the most straightforward cause and the easiest to rule out before calling an engineer.
- Faulty or stuck gas valve Common
The gas valve may have developed an internal fault preventing it from opening fully or allowing adequate gas flow, even when the control board sends the correct command. A gas valve that operates incorrectly can trigger repeated failed ignition attempts in quick succession, which is precisely what E134 describes.
- Gas valve wiring or connection fault Sometimes
Loose, corroded, or damaged wiring between the PCB and the gas valve can interrupt the control signal, causing the valve to behave erratically or fail to open correctly. This is electrically rather than mechanically caused, but produces the same symptom — no gas reaching the burner.
- PCB fault sending incorrect commands Rare
The printed circuit board coordinates ignition timing and gas valve operation. If the PCB is sending incorrect or mistimed signals to the valve, it may trigger repeated short firing cycles that the boiler interprets as E134. A PCB fault is typically identified only after the gas valve and wiring have been ruled out.
How to fix it
- Check that other gas appliances in your home are working DIY safe
Turn on a gas hob or gas fire to confirm gas is reaching your property. If nothing gas-powered is working, the issue lies with your supply rather than the boiler itself. Contact your gas network operator (Cadent, SGN, Northern Gas Networks, or Wales & West Utilities depending on your region) to report a supply problem. If you have a prepayment gas meter, check you have sufficient credit.
- Reset the boiler once or twice DIY safe
Locate the reset button on the boiler's front panel — on most Baxi models it is clearly marked. Press and hold it for approximately 3–5 seconds until the boiler attempts to restart. Allow a full restart cycle before judging the result. If the boiler fires up and runs normally, monitor it closely over the next few hours. If E134 returns promptly, do not continue resetting — repeated lockouts indicate a fault that needs professional diagnosis.
- Check your boiler warranty before booking a repair DIY safe
Baxi offers warranties of up to 10 years on some models when installed by a Baxi-accredited installer and serviced annually. Log the serial number from the data plate (usually inside the boiler casing or on the front panel) and check your warranty status via the Baxi website or your installer's paperwork. If you are still covered and have kept up annual services, a gas valve or PCB repair may cost you nothing.
- Call a Gas Safe registered engineer to diagnose and repair the fault Gas Safe engineer
Because E134 directly involves the gas valve and gas supply system, all further investigation must be carried out by a Gas Safe registered engineer. The engineer will measure gas pressure and flow at the appliance inlet, test the gas valve for correct mechanical and electrical operation, inspect wiring harness continuity between the PCB and valve, and assess the PCB if the valve checks out. Never attempt to interfere with the gas valve, gas pipework, or control board yourself — this is a legal requirement as well as a safety one.
Parts you may need
- Baxi gas valve assembly · from £95
- Gas valve wiring harness · from £25
- Baxi PCB (printed circuit board) · from £145
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 £150–£350, depending on the underlying cause.
Frequently asked questions
Can I reset my Baxi boiler to fix E134 myself?
You can try one or two resets, and occasionally E134 will clear if the fault was a momentary gas supply interruption. However, if the code returns after resetting, the boiler has identified a recurring problem that a reset will not cure. At that point you need a Gas Safe engineer — continuing to reset repeatedly without addressing the root cause is not safe practice and will not fix a faulty gas valve or wiring issue.
How much does it typically cost to fix a Baxi E134 fault in the UK?
Most people with this fault end up paying somewhere between £150 and £350 all-in, depending on the cause. A gas valve replacement including parts and labour commonly comes to around £200–£300. A wiring repair is usually at the lower end, often £100–£180. PCB replacement is the more expensive scenario — parts alone can be £145 or more, and with labour the total can push above £350 in some cases, though that is less common as the cause of E134.
Is E134 dangerous — should I stop using the boiler immediately?
The boiler will have locked itself out when E134 appears, so it is already in a safe state and not firing. You do not need to isolate anything yourself in normal circumstances. However, if you smell gas at any point, do not attempt to reset the boiler — turn off the gas at the meter, ventilate the property, and call the National Gas Emergency Service on 0800 111 999 immediately.
Could a lack of boiler servicing cause E134?
An annual service keeps the gas valve, wiring, and ignition components in good condition and allows an engineer to spot early signs of wear. A boiler that has gone several years without a service is more likely to develop a gas valve or wiring fault that results in codes like E134. Keeping up with annual services also keeps your Baxi warranty valid, which could save you the full cost of a repair.