Potterton Ultra 2 50 DV Fault codes & diagnostics

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

Regular Natural Gas 14.6 kW 1994-2001 Discontinued

Replaced by: Potterton Profile

Download the Potterton Ultra 2 50 DV manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. 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 →

Fault codes

All 2 documented codes

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Lockout

Your boiler has detected a safety issue and has shut itself down to prevent damage, meaning it needs a simple manual reset to try and start up again.

High Engineer only £120-250

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board
Full explanation for Lockout
Red Neon

Your boiler has detected a problem and safely shut itself down to prevent damage, meaning you currently have no heating or hot water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB
  • Flame Sensor

Related codes

Full explanation for Red Neon
Status & diagnostic codes

6 operating states & engineer diagnostics

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

Flame Status Your boiler is flagging that it detects a flame when it shouldn't be, which could indicate a sensor fault or an issue with the internal gas valve failing to shut off correctly. Green neon Status The green light you see simply indicates that your boiler is working correctly and the main burner is currently lit. Permanent Live Diagnostic Your boiler is currently in electrical setup mode, which simply means it is receiving power to verify that the wiring connection is active. Reversed Polarity Diagnostic Your boiler has detected that the electrical supply is connected back-to-front, which is a common issue often caused by recent electrical work or a faulty wall plug. Switched Live Diagnostic This indicator light confirms that your boiler is receiving an electrical signal from your thermostat or timer to turn on and heat your home. Thermostat + Status Your boiler is correctly receiving a signal from your wall thermostat to turn on and heat your home.