Ideal WLX RS50 / RS60 Fault codes & diagnostics

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

Regular Natural Gas 14.6-17.6 kW 1983-1994 Discontinued

Replaced by: Classic NF

The fault code is already on your display

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

Fault codes

All 2 documented codes

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1. PILOT WILL NOT LIGHT

Your boiler is unable to start its small internal flame, meaning the main heating system cannot turn on.

High Engineer only £90-180

Parts commonly replaced

  • Pilot Injector
  • HT Lead
  • Ignition Electrode
  • Piezo Igniter Unit
Full explanation for 1. PILOT WILL NOT LIGHT
3. PILOT LIT, BUT NO MAINS GAS

Your boiler's small pilot light is on, but the main burner is failing to ignite to provide heating or hot water.

High Engineer only £120-300

Parts commonly replaced

  • Gas Control Valve
  • Control Box
  • Boiler Thermostat
Full explanation for 3. PILOT LIT, BUT NO MAINS GAS