Ideal Mexico Slimline RS3/40 Fault codes & diagnostics

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

Regular Natural Gas 2001 Discontinued
GC Number 41-348-04
Download the Ideal Mexico Slimline RS3/40 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

The fault code is already on your display

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

All 3 documented codes

Tap any card for details

47

Your boiler is unable to start the small pilot flame needed to ignite the main heating system.

High Engineer only £100-£250

Parts commonly replaced

  • Thermocouple
  • Pilot Injector
  • Gas Control Valve
  • Ignition Electrode
48

Your boiler is failing to keep the pilot light burning after you let go of the ignition button, meaning the heating cannot start.

High Engineer only £90-180

Parts commonly replaced

  • Thermocouple
  • Gas control valve
  • Overheat thermostat

Related codes

49

Your boiler has successfully lit its pilot light, but the main burner is failing to ignite because it is not receiving the main supply of gas.

High Engineer only £150-250

Parts commonly replaced

  • Gas valve
  • PCB
  • Thermocouple

Related codes