Glow-worm Micron 80 FF Fault codes & diagnostics

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

Gas 2001-present
GC Number 41-047-51
Download the Glow-worm Micron 80 FF 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 →

Severity at a glance

Each cell = one fault code. Hover to identify.
5 High 1 Low
Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
41-047-51 Micron 80 FF 2001–present

Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.

Just want the most common Glow-worm Micron 80 FF faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 6 documented codes

Tap any card for details

Ignition Lockout

Your boiler has stopped trying to light because it failed to detect a flame, meaning you currently have no heating or hot water.

High DIY-safe £100-£250

What to check first

  1. Check if other gas appliances in your home are working to confirm your gas supply is on.
  2. Locate the reset button on your Glow-worm Micron 80 FF and hold it down for up to 5 seconds to try and restart the boiler.
  3. Check that your pre-payment gas meter has credit if applicable.

Parts commonly replaced

  • Ignition lead
  • Spark electrode
  • Gas valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for Ignition Lockout
Non-Volatile Lockout

Your boiler has safely shut itself down and refuses to start up again because it failed to ignite properly.

High DIY-safe £150-300

What to check first

  1. Check that your gas supply is turned on and other gas appliances like the cooker are working.
  2. Look at the condensate pipe outside to ensure it is not frozen or blocked.
  3. Locate the reset button on your boiler, press and hold it for up to 10 seconds to see if the ignition cycle restarts.

Parts commonly replaced

  • Ignition lead
  • Spark electrode
  • Gas valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for Non-Volatile Lockout
Other Errors

Your boiler has registered an unspecified system error that requires a professional engineer to properly diagnose and resolve.

High Engineer only £90-250

Parts commonly replaced

  • Printed Circuit Board
  • Wiring harness
  • Safety sensor

Related codes

Full explanation for Other Errors
PCB Failure

Your boiler's main electronic control center has stopped working properly, which means the boiler cannot safely operate and has shut down.

High Engineer only £250-400

Parts commonly replaced

  • Printed Circuit Board (PCB)
Full explanation for PCB Failure
Software Error

Your boiler's internal computer brain has encountered a glitch or failure and is struggling to run its operating system.

High DIY-safe £280-450

What to check first

  1. Switch the boiler's electrical power supply off at the fused spur switch
  2. Wait for approximately 60 seconds
  3. Switch the power back on and see if the error clears

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
Full explanation for Software Error
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