This fault can involve incomplete combustion and carbon monoxide.
If anyone in the property feels sick, dizzy or drowsy, or you can smell gas: open the windows, leave the building, and do not switch anything on or off. Then call the National Gas Emergency Service.
0800 111 999Baxi E130 fault codewhat it means and how to fix it
"Flue NTC operated": the flue gas got too hot and the boiler shut down. Baxi allow one reset on every generation, then it is a heat exchanger or flue problem for an engineer.
Stop — this needs an engineer
Get a Gas Safe registered engineer to look at your Baxi E130
We do not pass enquiries to a repair firm, so there is no form here. Find a Gas Safe registered engineer through the Gas Safe Register, and ask to see their registration card when they arrive — it is the register, not the van, that tells you they are qualified.
Has it happened before?
The right answer depends on what you can see. Pick the one that matches.
Choose the option on the left that matches what your appliance is doing, and the answer for that case appears here.
First time, and the boiler is otherwise running well
Baxi allow the single reset: selector to R for five seconds, or the Reset button on a digital-display boiler.
Reset once. If it runs and stays clear, mention it at the next service and have the exchanger inspected.
It has come back, or it arrives with E110 or E125
The heat exchanger is not transferring heat properly, on one side or the other. Baxi's own wording is that a code displayed regularly needs your installer.
Stop resetting and book a Gas Safe registered engineer.
What E130 means
E130 is "Flue NTC Operated" on the selector-switch Baxis and "Flue NTC operated" on the digital-display ones, and Baxi's explanation is the same sentence in every manual: "E110 shows overheat of the primary water and E130 overheat of the flue system." The flue thermistor at the top of the heat exchanger has read a temperature above its limit, and the boiler has stopped rather than keep sending exhaust that hot up a plastic flue.
Baxi's professional page calls it "Flue thermostat sensor tripped (lockout)". It is one of the three codes the selector-switch generation lets a householder reset: the Platinum user guide pairs it with E110, gives the five-second selector hold, and ends with the sentence about contacting your installer if it does not relight or is displayed regularly. On the 600, 800 and Compact the same code carries the R symbol and clears with the Reset button, though 130 is not in the printed list of codes the manual says "it is possible to relight".
Flue gas runs hot for two reasons. Either the heat exchanger is not taking the heat out of it — the water side is scaled or sludged, or not circulating — or the combustion side is fouled, so the flame is heating the flue gas more than the water. The 600 Combi flow for 130 goes to the sensor itself first: the flue sensor reads about 20 kΩ at 25 °C, and a sensor that has drifted is replaced. This page is rated danger because the flue is where a boiler's combustion products go, and a fault that keeps overheating it has a combustion or heat-transfer cause an engineer should see before the boiler is run again.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Heat exchanger fouled on the combustion side | Deposit on the fins stops the flame's heat reaching the water, so it goes up the flue instead. The fix is a strip and clean of the exchanger at a service. | Common |
| Poor water-side heat transfer | Scale or sludge inside the exchanger, or slow circulation from a tired pump, means the metal runs hot and the flue gas with it. E130 often arrives alongside E110 or E125 on such a system. | Common |
| Flue NTC sensor drifted | Baxi's flow checks the sensor: about 20 kΩ at 25 °C, falling as it warms. A sensor reading high for its temperature trips the limit on a healthy boiler. Baxi part 7207892 on the 600 and 800. | Occasional |
| Gas valve set rich | A valve that has drifted towards too much gas burns hotter than the exchanger is designed for. Checked with a combustion analyser against the CO2 values in the manual. | Rare |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£0–£600
Time on site
1 hour
One reset costs nothing. Flue sensor (Baxi 7207892) fitted £90–£140. Heat exchanger strip and clean £120–£200 as part of a service. Heat exchanger replacement £450–£600.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Parts you may need
We may earn a commission if you buy a part through one of these links. It does not change what you pay, and it does not affect which parts we list.
Magnetic system filter, 22mm
MAG-22£65–£120Plumbing merchant
Price checked 28 September 2026
Baxi / Potterton / Main flue NTC sensor
7207892£22–£50Authorised Baxi parts distributor
Price checked 28 September 2026
Baxi / Potterton / Main pump assembly
7684006£120–£240Authorised Baxi parts distributor
Price checked 28 September 2026
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Related Baxi fault codes
- E160Stop — call an engineerFan fault on every three-digit Baxi. The boiler will not light without proof the fan is moving combustion air. No householder reset on any generation; fan, wiring or board.Related: fan and flue
- E28Get it checkedFlue thermistor fault — and on the Platinum ranges also the air pressure switch, a blocked flue or a blocked condensate drain. Which meaning applies depends on which Baxi you have.Related: fan and flue
- E.04.13Stop — call an engineerFan blocked or over speed on the Baxi 200/400 Combi and Combi 2. Baxi's remedy is the fan-and-PCB connection, then the air-gas unit. No householder fix; do not keep resetting.Related: fan and flue
- E.01.20Stop — call an engineer"Maximum flue gas temperature reached" on the Baxi 200/400 Combi and Combi 2. Baxi's cause is a heat exchanger blocked on the flue side; the fix is a strip and clean, not a reset.Related: fan and flue
- E133Get it checkedBaxi's ignition lockout: "the gas supply has been interrupted, ignition has failed or the flame has not been detected". Check the gas is on, reset once. If it returns, stop.Related: same brand
- E118Get it checkedLow water pressure on the digital-display Baxis: 600, 800, Duo-tec 2, Compact, Assure, Megaflo. Defined by Baxi as primary pressure under 0.5 bar. Repressurise and it clears itself.Related: same brand
Own a Baxi boiler? Save it and its codes come first next time.
Related guides
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer technical and service documentation
- Manufacturer support portal
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.