Baxi Platinum Combi HE (2007) Fault codes & diagnostics

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

Combi Natural Gas 28 kW 2007-2008 Discontinued

Replaced by: Platinum Combi HE A

The Platinum range comes in 4 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.
2 Emergency 7 High 1 Medium

All 10 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 is not working properly.

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

Parts commonly replaced

  • Central Heating NTC Sensor
  • Wiring Harness

Related codes

E28

Your boiler has temporarily stopped working because it has detected a problem with the temperature sensor located in the exhaust flue.

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

Parts commonly replaced

  • Flue NTC Sensor
  • Wiring Harness

Related codes

E50

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

Medium Engineer only £90-160 Shared across the Platinum Combi range

Parts commonly replaced

  • Domestic Hot Water NTC Thermistor
  • Wiring Harness

Related codes

E110

Your Baxi boiler has automatically shut down because it detected dangerously high internal temperatures.

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

Parts commonly replaced

  • Safety thermostat
  • Automatic bypass valve
  • Circulating pump
  • PCB

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 Combi range

What to check first

  1. Locate the filling loop (two valves connected by a flexible silver hose under the boiler).
  2. Open both valves slowly to let mains water into the system while watching the pressure gauge on the front panel.
  3. Stop filling when the needle reaches between 1.0 and 1.5 bar, then firmly close both valves.

Parts commonly replaced

  • Water Pressure Switch
  • Pressure Relief Valve
  • Expansion Vessel

Related codes

E125

Your boiler has stopped working because water is not flowing properly through the internal pipes to heat your home.

High Engineer only £150-350 Shared across the Platinum Combi range

Parts commonly replaced

  • Circulating pump
  • Automatic bypass valve
  • Plate heat exchanger

Related codes

E130

Your boiler has safely shut down because the temperature sensor inside the flue has detected that the exhaust gases are getting too hot.

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

Parts commonly replaced

  • Flue NTC thermistor
  • Primary heat exchanger
  • PCB

Related codes

E133

Your boiler has stopped working because it is not receiving enough gas or the flame has gone out.

High Engineer only £150-£350 Shared across the Platinum Combi range

Parts commonly replaced

  • Gas Valve
  • Ignition Electrode
  • PCB

Related codes

E160

Your boiler has detected an issue with the internal fan that safely pushes harmful exhaust gases outside, so it has shut down to protect your home.

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

Parts commonly replaced

  • Flue Gas Fan
  • Fan Wiring Harness
  • Printed Circuit Board (PCB)

Related codes

E193

Your boiler is temporarily locking out because the water inside is not circulating properly before it attempts to fire up.

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

Parts commonly replaced

  • Circulating Pump
  • Automatic Air Vent
  • Printed Circuit Board (PCB)

Related codes