Ideal Esprit Eco Fault codes & diagnostics

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

Gas 2012-present

The Esprit Eco range comes in 2 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 27 High 2 Medium 1 Low

All 31 documented codes

Tap any card for details

5 Boiler Resets in 15 minutes

Your boiler has repeatedly shut down and restarted itself five times in a very short period, suggesting it is struggling to function safely or sustain its operation.

High Engineer only £150-350 Shared across the Esprit Eco range

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Ignition Electrode
  • Flame Rectification Probe

Related codes

BCC Activation Fault

Your boiler has detected an issue with the internal identification key that helps it communicate with its control system, causing it to stop operating until the connection is restored.

High Engineer only £150-250 Shared across the Esprit Eco range

Parts commonly replaced

  • BCC Plug
  • Main Control Board

Related codes

BCC Fault

Your boiler has detected a communication error with its 'Boiler Configuration Card', which is a small memory chip that stores your specific boiler settings.

High Engineer only £150-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Boiler Configuration Card (BCC)
  • Main Control PCB

Related codes

Boiler Type Card Fault

Your boiler has lost the digital instructions telling it how to function, which prevents it from starting up correctly.

High Engineer only £150-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Boiler Interface Card
  • PCB

Related codes

C0

Your boiler's internal memory chip is not communicating correctly with the main computer, preventing the boiler from starting safely.

High Engineer only £150-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Boiler Control Card (BCC)
  • Wiring harness

Related codes

C2

Your boiler's electronic memory card is not being recognised, which prevents the system from starting up safely.

High Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • Boiler Chip Card (BCC)
  • Main PCB
F and 1

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

High DIY-safe Shared across the Esprit Eco range

What to check first

  1. Locate the filling loop underneath your boiler or check the built-in keyless filling link.
  2. Open the valves slowly to allow mains water into the system until the pressure gauge reads between 1 and 1.5 bar.
  3. Close the valves firmly and press the reset button on your boiler.

Parts commonly replaced

  • Pressure relief valve
  • Pressure sensor

Related codes

F and 2

Your boiler's flame has unexpectedly gone out while trying to run, which safely shuts down the system.

High Engineer only £90-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Sump trap
  • Main PCB

Related codes

F and 3

Your boiler has detected an issue with the internal fan that safely removes combustion gases, causing it to lock out for safety.

High Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • Flue
  • Air pressure switch
  • Fan assembly
  • PCB

Related codes

F1

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

High DIY-safe £80-120 Shared across the Esprit Eco range

What to check first

  1. Locate the internal filling loop, which is usually a small silver lever or a braided hose under the boiler.
  2. Open the filling valve slowly until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.
  3. Close the valve tightly and check that the fault code disappears.

Parts commonly replaced

  • Pressure sensor
  • Filling loop
  • Pressure relief valve

Related codes

Showing 11–20 of 31
F3

Your boiler has detected an issue with the fan that safely clears exhaust gases, preventing it from starting up for your safety.

High Engineer only £250-£450 Shared across the Esprit Eco range

Parts commonly replaced

  • Fan assembly
  • PCB (Printed Circuit Board)
  • Wiring harness

Related codes

F4

Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit, meaning it cannot safely regulate heat.

High Engineer only £100-180 Shared across the Esprit Eco range

Parts commonly replaced

  • Flow thermistor (NTC sensor)
  • Wiring harness
  • Main PCB

Related codes

F5

Your boiler has detected a sensor problem that means it cannot accurately measure the temperature of the water returning to the unit, causing it to shut down for safety.

High Engineer only £90-180 Shared across the Esprit Eco range

Parts commonly replaced

  • Return thermistor (NTC sensor)
  • Wiring harness
  • Main PCB

Related codes

F7

Your boiler has detected that the electrical supply coming into your home is too low for it to operate safely.

High Engineer only £100-350 Shared across the Esprit Eco range

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • External Voltage Regulator

Related codes

F9

Your boiler's main computer control panel is experiencing a software or internal communication error, meaning the boiler has safely shut down to prevent incorrect operation.

High Engineer only £250-450 Shared across the Esprit Eco range

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness

Related codes

False Flame Lockout

Your boiler has detected a flame when it shouldn't be there, so it has safely shut itself down to prevent any risk.

Emergency Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • Flame rectification electrode
  • Gas valve
  • PCB

Related codes

Fan Fault

Your boiler has detected a problem with its internal fan and has shut down as a safety precaution, meaning you will not have any heating or hot water.

High Engineer only £250-£450 Shared across the Esprit Eco range

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Wiring harness
Flame Loss

Your boiler has detected that the flame inside has gone out unexpectedly and it cannot stay alight, so it has safely shut itself down to prevent gas from building up.

High Engineer only £150-350 Shared across the Esprit Eco range

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Condensate trap
  • Flame rectification probe

Related codes

Flow Temperature Overheat

Your boiler has detected that the water inside the system is getting dangerously hot and has automatically shut down to prevent damage.

High Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • Pump
  • System Filter
  • Diverter Valve
  • NTC Sensor

Related codes

Flow Thermistor

Your boiler's temperature sensor is providing faulty readings, causing the system to stop operating as it cannot safely monitor how hot the water is getting.

High Engineer only £120-220 Shared across the Esprit Eco range

Parts commonly replaced

  • Flow NTC Thermistor
  • Wiring harness

Related codes

Showing 21–30 of 31
Ignition Lockout

Your boiler has failed to light the flame, so it has safely shut itself down to prevent a build-up of unburnt gas.

High Engineer only £120-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Control board (PCB)

Related codes

L and 1

Your boiler has temporarily shut down because the water inside it has become too hot.

High Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • NTC thermistor
  • Pump
  • Heat exchanger

Related codes

L and 2

Your boiler has failed to light its flame after a few attempts, so it has safely shut itself down to prevent a gas build-up.

High Engineer only £90-250 Shared across the Esprit Eco range

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB

Related codes

L and 5

Your boiler has temporarily locked itself out for safety after registering too many automatic resets in a short space of time.

High Engineer only £100-250 Shared across the Esprit Eco range

Parts commonly replaced

  • PCB
  • Ignition Lead
  • Gas Valve

Related codes

L and 6

Your boiler has mistakenly detected a flame inside when it should be switched off, so it has safely locked itself out to prevent any issues.

High Engineer only £150-300 Shared across the Esprit Eco range

Parts commonly replaced

  • Gas valve
  • Main printed circuit board (PCB)

Related codes

L2

Your boiler has tried to start up several times but couldn't successfully light the flame.

High Engineer only £100-£250 Shared across the Esprit Eco range

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

Low Mains Voltage

Your boiler is struggling because the electricity supply coming into your home is weaker than the level required to operate the unit safely.

Medium Engineer only £120-250 Shared across the Esprit Eco range

Parts commonly replaced

  • PCB
  • Wiring harness
Low Water Pressure

Your boiler has stopped working because the water level inside the system has dropped too low and needs topping up.

High DIY-safe £0-120 Shared across the Esprit Eco range

What to check first

  1. Locate the filling loop (usually a silver flexible hose) underneath the boiler.
  2. Slowly open the one or two taps on the loop until you hear water flowing.
  3. Watch the pressure gauge on the screen until it reaches 1.5 bar, then close the taps tightly.

Parts commonly replaced

  • Filling loop valve
  • Expansion vessel
  • Pressure sensor

Related codes

Outside Sensor Failure

Your boiler has lost the connection to the weather sensor outside your home and will now run using its own internal settings instead.

Low Engineer only £120-200 Shared across the Esprit Eco range

Parts commonly replaced

  • Outside weather sensor
  • Wiring loom
Return Thermistor

Your boiler is struggling to read the temperature of the water returning from your radiators, which prevents it from heating your home efficiently.

Medium Engineer only £120-220 Shared across the Esprit Eco range

Parts commonly replaced

  • Return NTC Thermistor
  • Wiring harness

Related codes

Showing 31–31 of 31
Unconfigured PCB

The computer brain of your boiler has not been told which specific model it is installed in, so it cannot safely start the system.

High Engineer only £120-200 Shared across the Esprit Eco range

Parts commonly replaced

  • Electronic Control Board (PCB)

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