Baxi Combi 130e Fault codes & diagnostics

13 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 30 kW 2000-2007 Discontinued

Replaced by: Baxi Platinum Combi

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
10 High 2 Medium 1 Low
Just want the most common Baxi Combi 130e faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 13 documented codes

Tap any card for details

LED / flash-pattern codes
A neon flashing

Your boiler is struggling to light or cannot keep the flame burning, which has caused it to shut down for safety.

High DIY-safe £100-£250

What to check first

  1. Check that your gas pre-payment meter (if applicable) has credit.
  2. Verify that other gas appliances, like a cooker, are working to ensure gas supply exists.
  3. Reset the boiler by turning the selector switch to 'R' for at least five seconds and then back to the desire setting.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Lead
Full explanation for A neon flashing
B neon flashing

Your boiler has stopped working because water is not moving through the system properly or there is not enough water inside it.

High DIY-safe £180-350

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.
  2. If the pressure is too low, use the filling loop to top it up.
  3. Ensure all radiator valves and isolation valves are fully open.

Parts commonly replaced

  • Circulating Pump
  • Primary Water Pressure Switch
  • Flow Temperature Sensor
Full explanation for B neon flashing
B, C, D, E & F neons flashing

Your boiler has detected a problem with how it moves air and exhaust gases through the system, causing it to shut down for safety.

High Engineer only £120-£240

Parts commonly replaced

  • Air Pressure Switch
  • Venturi Tube
  • Fan
Full explanation for B, C, D, E & F neons flashing
C neon flashing

Your boiler has detected that water isn't moving through the internal pipes effectively, which prevents it from heating up safely.

High DIY-safe £120-280

What to check first

  1. Check that the boiler pressure is between 1.0 and 1.5 bar on the gauge
  2. Open any radiator valves that are turned off to ensure water can flow
  3. Ensure the main stop tap and any isolation valves under the boiler are fully open

Parts commonly replaced

  • Pump
  • Primary Flow Switch
  • Diaphragm

Related codes

Full explanation for C neon flashing
D neon flashing

Your boiler has become too hot and has shut down as a safety precaution to prevent damage.

High DIY-safe £100-£250

What to check first

  1. Turn the boiler off and allow it to cool down for 30 minutes
  2. Ensure all radiator valves are fully open to allow water to flow
  3. Turn the selector switch to the reset position for five seconds and then back to the menu

Parts commonly replaced

  • Overheat Thermostat
  • Central Heating Pump
  • Flue Thermostat
Full explanation for D neon flashing
E neon flashing

Your boiler has detected a problem with one of its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has stopped working as a safety precaution.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Sensor
  • Domestic Hot Water NTC Sensor
Full explanation for E neon flashing
neon (flashing)

Your boiler is simply letting you know that it is pre-warming the water so you get hot water at your taps more quickly.

Low DIY-safe

What to check first

  1. No action is required as this is a normal operating function and not a fault.
  2. If you wish to stop the flashing, you can turn the 'Preheat' or 'DHW' selector dial to the off position.
  3. Monitor the boiler for any alternative lights that stay solid, as this would indicate a genuine issue.
Full explanation for neon (flashing)
Digital codes
24

Your boiler has stopped working because it cannot light the flame or the internal drainage pipe is backed up with water.

High DIY-safe £90-280

What to check first

  1. Check if your shared external white drainage pipe is frozen or blocked.
  2. If frozen, pour warm (not boiling) water over the pipe to clear the ice.
  3. Press the reset button once to see if the boiler restarts.

Parts commonly replaced

  • Flame sensing electrode
  • Ignition lead
  • Gas valve
  • Condensate trap
Full explanation for 24
25

Your boiler has shut down because a safety sensor has detected that the system is starting to overheat.

High DIY-safe £120-£350

What to check first

  1. Ensure all radiator valves are fully open
  2. Check that the system water pressure is between 1.0 and 1.5 bar
  3. Switch the selector dial to the reset position for five seconds and release

Parts commonly replaced

  • Safety Thermostat (Overheat Limit)
  • Circulation Pump
  • Main Heat Exchanger (Descaling)
Full explanation for 25
26

Your boiler has stopped working because the fan cannot safely clear exhaust fumes from the system.

High Engineer only £150-£350

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Venturi tube
Full explanation for 26
27

Your boiler is struggling to circulate water, which is usually caused by the system pressure being too low or a problem with the internal pump.

High DIY-safe £180-350

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.
  2. If the pressure is too low, use the filling loop underneath the boiler to top it up.
  3. Reset the boiler by turning the selector switch to 'R' for five seconds.

Parts commonly replaced

  • Circulating Pump
  • Water Pressure Sensor
  • Expansion Vessel Re-charge

Related codes

Full explanation for 27
28

Your boiler is likely struggling to monitor or control the temperature of your hot water properly due to a faulty internal sensor.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC Sensor
  • Sensor wiring harness
Full explanation for 28
29

Your boiler has detected an issue with the sensor that monitors the temperature of the water used for your radiators, causing the heating to stop working correctly.

Medium Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Temperature Sensor
  • Sensor Wiring Harness
Full explanation for 29