Baxi Platinum Combi Fault codes & diagnostics

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

Combi Natural Gas 24-40 kW 2010-present

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All 10 documented codes

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E20

Your boiler's temperature sensor for the heating system has developed a fault, meaning the boiler can no longer monitor how hot the water is.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Sensor
  • Sensor Wiring Harness

Related codes

E28

Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.

High Engineer only £120-£220

Parts commonly replaced

  • Flue NTC Sensor
  • Wiring harness
  • Main PCB

Related codes

E50

Your boiler's hot water sensor has developed a fault, meaning the system cannot accurately measure the temperature of the water coming out of your taps and has stopped providing hot water to keep you safe.

High Engineer only £90-160

Parts commonly replaced

  • Hot Water NTC Sensor
  • Sensor Wiring Loom

Related codes

E110

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

High DIY-safe £100-£280

What to check first

  1. Ensure all radiator valves are fully open to allow water to flow.
  2. Check that your system pressure is between 1 and 1.5 bar on the pressure gauge.
  3. Wait for the boiler to cool down and then press the 'Reset' button for five seconds.

Parts commonly replaced

  • Overheat Thermostat (Limit Statutory)
  • Water Pump
  • Heat Exchanger (de-scale)

Related codes

E119

Your boiler has stopped working because the water pressure in the system has dropped too low.

High DIY-safe £0-160

What to check first

  1. Locate the filling loop (usually blue-handled levers) underneath the boiler.
  2. Slowly open both taps until you hear water entering and see the pressure gauge rise.
  3. Close both taps tightly once the needle reaches between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Water pressure sensor
  • Expansion vessel

Related codes

E125

Your boiler has detected that hot water isn't moving through the system properly, which usually means it is overheating and has shut down as a safety precaution.

High DIY-safe £180-450

What to check first

  1. Check if any radiator valves are turned off and open them fully.
  2. Ensure the boiler pressure is between 1.0 and 1.5 bar on the pressure gauge.
  3. Try resetting the boiler to see if the fault clears after a brief cooling down period.

Parts commonly replaced

  • Circulation Pump
  • Diverter Valve
  • Plate Heat Exchanger

Related codes

E130

Your boiler has shut down because the exhaust gases have reached a temperature that is too high, or the safety sensor that monitors them has detected a fault.

High Engineer only £120-£280

Parts commonly replaced

  • Flue NTC Sensor
  • Main Heat Exchanger

Related codes

E133

Your boiler is failing to light the gas or stay lit, meaning your heating and hot water have stopped working.

High DIY-safe £100-350

What to check first

  1. Check your gas meter to ensure the valve is open and you have credit.
  2. Try turning on another gas appliance like a hob to see if the gas supply is active.
  3. Press and hold the 'R' or 'Reset' button for five seconds.
  4. In winter, check if the white plastic condensate pipe outside has frozen and thaw it with warm water if necessary.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Electrode
  • Printed Circuit Board (PCB)

Related codes

E160

Your boiler has stopped working because the fan that clears out exhaust gases is not spinning or communicating correctly with the main control board.

High Engineer only £250-450

Parts commonly replaced

  • Extractor Fan
  • PCB (Main Circuit Board)
  • Fan Wiring Harness
E193

Your boiler has detected that water is not circulating correctly through the system before the burner ignites, often due to a blockage or trapped air.

High DIY-safe £120-£350

What to check first

  1. Check that all radiator valves and boiler isolation valves are fully open
  2. Gently bleed your radiators to remove any trapped air pockets
  3. Check the boiler pressure gauge and top it up to 1.5 bar if it is too low

Parts commonly replaced

  • Circulation Pump
  • Automatic Air Vent
  • Primary Heat Exchanger (if scaled)

Related codes