Potterton Gold Heat ErP Fault codes & diagnostics

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

Heat Natural Gas 2006 onwards Discontinued
Choose your boiler type

The Gold range comes in 3 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

15 Heat ErP 4 codes · 1 GC number 18 Heat ErP 4 codes · 1 GC number 24 Heat ErP 4 codes · 1 GC number
View the Potterton Gold Heat ErP manual Opens the manufacturer's manual on an external site. We're preparing a hosted copy. Open

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Just want the most common Potterton Gold Heat ErP faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 4 documented codes

Tap any card for details

LED / flash-pattern codes
Lights Flash On Flash

Your boiler has failed to light after several attempts and has locked itself for safety.

High DIY-safe £90-280 Shared across the Gold range

What to check first

  1. Check that your gas pre-pay meter has credit (if applicable).
  2. Ensure your gas stopcock is fully open.
  3. Turn the selector switch to the 'Reset' position for five seconds, then turn it back to the heating or hot water setting.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB

Related codes

Full explanation for Lights Flash On Flash
Lights Flash On On

Your boiler has detected an issue with the air fan system and has safely shut down to prevent poor combustion.

High Engineer only £180-350 Shared across the Gold range

Parts commonly replaced

  • Fan assembly
  • Air Pressure Switch
  • PCB

Related codes

Full explanation for Lights Flash On On
Lights On On Flash

Your boiler has switched itself off because it has become too hot internally and needs a manual reset to start again once it has cooled down.

High DIY-safe £90-250 Shared across the Gold range

What to check first

  1. Wait 30 minutes for the boiler to cool down completely.
  2. Ensure all radiator valves are fully open to allow water to circulate.
  3. Turn the selector knob to the 'Reset' position for five seconds, then turn it back to the original setting.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger

Related codes

Full explanation for Lights On On Flash
Digital codes
Lights Off Off Off

Your boiler has no power and appears completely dead, likely due to an issue with the electricity supply or a blown fuse.

High DIY-safe £80-250 Shared across the Gold range

What to check first

  1. Check if other appliances in your home are working to rule out a general power cut
  2. Check your main consumer unit (fuse box) to see if a circuit breaker has tripped
  3. Check the fused spur switch next to the boiler is turned on and the fuse inside it hasn't blown

Parts commonly replaced

  • Internal boiler glass fuse
  • Printed Circuit Board (PCB)
  • External fused spur

Related codes

Full explanation for Lights Off Off Off
Status & diagnostic codes

7 operating states & engineer diagnostics

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

A1 Diagnostic Your boiler is flagging a safety issue because its flue terminal is installed too close to an opening like a window or air vent, which could allow dangerous exhaust gases to enter your home. B1 Diagnostic Your boiler is flagging a safety concern because the flue terminal is positioned too close to an opening like a window or air vent, which could allow dangerous gases to enter your home. C1 Diagnostic Your boiler's exhaust flue is positioned too close to a window, air brick, or opening, which could lead to dangerous fumes being drawn back into your home. D2 Diagnostic Your boiler is displaying a warning because it has detected an issue related to external plumbing, such as a blocked or leaking condensate pipe located outside your home. E2 Diagnostic Your boiler has detected that the flue pipe is blocked or obstructed, preventing the safe escape of exhaust gases. F2 Diagnostic Your boiler is struggling to vent its exhaust gases safely because it is located in a restricted outdoor area, causing the system to shut down to prevent a build-up of fumes. G2 Diagnostic Your boiler is struggling to get rid of waste water or condensation, often because the drain pipe outside is blocked, frozen, or leaking.