Baxi Platinum Combi HE Fault codes & diagnostics

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

Combi Natural GasLPG 24-33 kW 2005-2007 Discontinued
GC Numbers 47-075-2047-075-2147-075-22

Replaced by: Platinum+ Combi

Download the Baxi Platinum Combi HE manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
9 High

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-075-20 Platinum 24 HE 2005–2007
47-075-21 Platinum 28 HE 2005–2007
47-075-22 Platinum 33 HE 2005–2007

All 9 documented codes

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E20

Your boiler's internal temperature sensor has stopped communicating correctly, preventing the system from heating your radiators.

High Engineer only £90-160

Parts commonly replaced

  • Central heating NTC sensor
  • Wiring harness

Related codes

E28

Your boiler is currently unable to sense the temperature of your hot water, so it has stopped producing it to prevent potential overheating.

High Engineer only £120-200

Parts commonly replaced

  • DHW NTC Sensor
  • Wiring harness

Related codes

E50

Your boiler's hot water sensor has stopped working, so the system is unable to tell how hot your water is and has stopped heating it for safety.

High Engineer only £90-160

Parts commonly replaced

  • Hot water NTC sensor
  • Wiring harness

Related codes

E110

Your boiler has reached an excessively high temperature and has shut down as a safety precaution to prevent damage.

High DIY-safe £100-350

What to check first

  1. Check that all radiator valves are fully open to allow water to circulate.
  2. Ensure your system pressure is between 1.0 and 1.5 bar on the front gauge.
  3. Try resetting the boiler by turning the selector knob to the 'R' position for five seconds.

Parts commonly replaced

  • Circulation pump
  • Overheat thermostat
  • NTC Temperature sensor

Related codes

E119

Your boiler has lost water pressure and has stopped working to protect itself from damage.

High DIY-safe £0-160

What to check first

  1. Locate the filling loop (the flexible braided hose) underneath or near the boiler.
  2. Slowly open the tap or valve(s) on the loop while watching the pressure gauge.
  3. Close the tap or valve(s) tightly once the gauge reaches between 1 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Water pressure sensor
  • Expansion vessel

Related codes

E125

Your boiler has detected that the internal mechanism responsible for circulating water around your radiators and taps is not operating correctly.

High Engineer only £180-350

Parts commonly replaced

  • Central heating pump
  • Pump head
  • Wiring harness

Related codes

E130

Your boiler has shut down because a sensor has detected that the exhaust gases are getting too hot or the sensor itself has failed.

High Engineer only £120-220

Parts commonly replaced

  • Flue NTC Sensor
  • Heat Exchanger cleaning
  • Wiring Harness

Related codes

E133

Your boiler is not receiving enough gas or is struggling to light the flame needed to heat your water and radiators.

High DIY-safe £100-£350

What to check first

  1. Check that your gas emergency control valve is open and any prepaid gas meter has credit.
  2. Ensure other gas appliances, like a hob, are working to confirm gas supply to the property.
  3. If it is freezing outside, check if your external condensate pipe has frozen and gently thaw it with warm water.
  4. Press the Reset button for five seconds to attempt to restart the boiler.

Parts commonly replaced

  • Gas valve
  • Spark electrode
  • Flame sensing probe
  • Printed Circuit Board (PCB)

Related codes

E160

Your boiler has detected a problem with the fan that helps clear exhaust fumes, meaning it has stopped working for safety reasons.

High Engineer only £250-£450

Parts commonly replaced

  • Fan assembly
  • Fan wiring harness
  • Main PCB