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

Replaced by: Platinum+ Combi

The Platinum range comes in 3 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

Each model has its own manual A family spans several manuals, one per model or generation. Pick your model above and its page has the manual its fault codes were read from.

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 7 High 1 Medium

All 9 documented codes

Tap any card for details

E20

Your boiler has lost track of how hot the water inside the heating system is because a temperature sensor has failed.

High Engineer only £90-180 Shared across the Platinum range

Parts commonly replaced

  • Central Heating NTC Thermistor
  • Wiring harness

Related codes

E28

Your boiler is struggling to accurately measure your hot water temperature because a sensor is faulty.

Medium Engineer only £90-180 Shared across the Platinum range

Parts commonly replaced

  • Hot Water NTC Thermistor
  • Wiring Harness

Related codes

E50

Your boiler has temporarily stopped working because it has detected an issue with the sensor that measures the temperature of the exhaust gases coming from the flue.

High Engineer only £100-£200 Shared across the Platinum range

Parts commonly replaced

  • Flue NTC sensor
  • Wiring harness

Related codes

E110

Your boiler has automatically shut down because it detected that the internal water temperature became dangerously high.

Emergency Engineer only £150-300 Shared across the Platinum range

Parts commonly replaced

  • Safety Thermostat
  • PCB
  • Automatic Bypass Valve

Related codes

E119

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

High DIY-safe Shared across the Platinum range

What to check first

  1. Locate the filling loop under your boiler or near the pipes.
  2. Open the valves slowly to let mains water into the system until the pressure gauge reads between 1 and 1.5 bar.
  3. Close both valves tightly and reset the boiler.

Parts commonly replaced

  • Water pressure switch
  • Pressure relief valve
  • Expansion vessel

Related codes

E125

Your boiler has detected an issue with the internal water pump, which means it cannot circulate water properly to provide heating or hot water.

High Engineer only £150-300 Shared across the Platinum range

Parts commonly replaced

  • Central Heating Pump
  • Pump Auto Air Vent
  • Printed Circuit Board (PCB)

Related codes

E130

Your boiler has temporarily stopped working because it has detected that the exhaust gases coming from the flue are too hot.

High Engineer only £100-£250 Shared across the Platinum range

Parts commonly replaced

  • Flue NTC sensor
  • Main PCB

Related codes

E133

Your boiler has temporarily stopped working because it cannot detect a steady flame, which usually points to an issue with your gas supply or the way the boiler is igniting.

High Engineer only £100-£250 Shared across the Platinum range

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

E160

Your boiler has stopped working because it cannot detect that the internal fan, which safely removes combustion gases, is operating properly.

High Engineer only £150-£300 Shared across the Platinum range

Parts commonly replaced

  • Fan Assembly
  • Wiring Harness
  • Printed Circuit Board (PCB)

Related codes