Vaillant Turbomax VUW 242/1 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 1997-2001 Discontinued
GC Number 47-044-02

Replaced by: Turbomax Plus 824

Download the Vaillant Turbomax VUW 242/1 manualThe official installation and service manual (PDF). PDF

This boiler uses indicator light combinations

Note which lights are on, off, or flashing and at what speed. Match the combination to the cards below. Do not reset until you have noted the pattern. How to read fault codes →

Fault codes

All 1 documented codes

Tap any card for details

Burner lock out indicator

Your boiler has stopped trying to light because it cannot detect a flame or is not receiving gas, leaving you without heating or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition lead
  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for Burner lock out indicator
Status & diagnostic codes

5 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Fan operation indicator Status Your boiler's fan system is running correctly to safely remove exhaust gases, and the indicator light is simply confirming that this part of the startup process is working as intended. Flame indicator Status Your boiler is operating normally and has successfully lit the flame to start heating your home or water. Hot water demand indicator Status Your boiler is correctly recognizing that you have turned on a hot tap and is working exactly as it should. Ignition indicator Status Your boiler is struggling to light the burner, meaning it is currently unable to produce heat or hot water. Power on indicator Status Your boiler is receiving electrical power and is currently in its normal standby state, ready to provide heating or hot water when requested.