Ideal Esprit Fault codes & diagnostics

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

Combi Natural Gas 24-30 kW 2007-2010 Discontinued
GC Numbers 47-348-4647-348-4747-348-48

Replaced by: Logic

Download the Ideal Esprit 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.
7 High
Versions & GC numbers

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
47-348-46 Esprit HE 24 2007–2010
47-348-47 Esprit HE 30 2007–2010
47-348-48 Esprit HE 35 2007–2010
Just want the most common Ideal Esprit faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 7 documented codes

Tap any card for details

F1

Your boiler has stopped working because there is not enough water inside the system to operate safely.

High DIY-safe £0-120

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 hose until you hear water flowing.
  3. Watch the pressure gauge and close the taps when the needle reaches between 1 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for F1
F2

Your boiler has started an ignition process but the flame has gone out, meaning your system has shut down for safety.

High DIY-safe £100-350

What to check first

  1. Check that your gas emergency control valve is open and you have credit on your gas meter
  2. Check if other gas appliances, like a hob, are working correctly
  3. Press the 'Reset' button on the front of the boiler display

Parts commonly replaced

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

Related codes

Full explanation for F2
H 9

Your boiler has shut itself down because it has become too hot to operate safely.

High Engineer only £150-300

Parts commonly replaced

  • Primary heat exchanger
  • NTC thermistor
  • Pump

Related codes

Full explanation for H 9
L 9

Your boiler has detected that it is running too hot and has automatically shut down to prevent any internal damage.

High Engineer only £150-300

Parts commonly replaced

  • System filter
  • Central heating pump
  • Heat exchanger
  • Diverter valve

Related codes

Full explanation for L 9
L1

Your boiler has stopped working because the water inside has become too hot or is not circulating through the system correctly.

High DIY-safe £100-£350

What to check first

  1. Check that your radiator valves are open
  2. Ensure there are no blockages or frozen pipes (if applicable)
  3. Reset the boiler by turning the mode knob to 'reset' and then back to the original setting

Parts commonly replaced

  • Circulating Pump
  • Thermistor (NTC Sensor)
  • Main Heat Exchanger

Related codes

Full explanation for L1
Low water pressure

Your boiler has detected that there is not enough water in the system to operate safely, causing it to shut down to prevent damage.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible silver hose) underneath the boiler.
  2. Slowly open the one or two taps/valves on the filling loop until you hear water flowing.
  3. Watch the pressure gauge and close the taps firmly once the needle reaches between 1 and 1.5 bar.

Parts commonly replaced

  • Filling loop valve
  • Expansion vessel
  • Pressure relief valve

Related codes

Full explanation for Low water pressure
Water pressure

Your boiler has lost water pressure, meaning there isn't enough water in the system to operate safely and effectively.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (braided silver hose) underneath or near the boiler.
  2. Open the small taps on the filling loop until the pressure gauge rises to between 1.0 and 1.5 bar.
  3. Close the taps tightly and restart the boiler.

Parts commonly replaced

  • Filling loop valve
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for Water pressure