Glow-worm Betacom C Fault codes & diagnostics

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

Combi Natural Gas 24-30 kW 2008 onwards Discontinued
GC Numbers 47-019-0847-019-0947-019-41

Replaced by: Betacom 4

Download the Glow-worm Betacom C manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. 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 →

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
47-019-08 Betacom 24c 2008–2013
47-019-09 Betacom 30c 2008–2013
47-019-41 Betacom3 24c 2016–present
Fault codes

All 2 documented codes

Tap any card for details

LED / flash-pattern codes
Burner indicator Flashing

Your boiler has detected a simple operating error that usually means a control knob is in the wrong position or the system needs a basic restart.

Medium DIY-safe £0-80

What to check first

  1. Check that the Hot Water control knob is set to a normal temperature position
  2. Turn the left-hand control knob to the 'Reset' position
  3. Hold it for a few seconds, then turn it back to your desired setting

Parts commonly replaced

  • None (usually a settings issue)
  • Control Knob
Full explanation for Burner indicator Flashing
Digital codes
Condensate Drain Blockage

Your boiler has stopped working because the waste water pipe that carries away moisture is blocked, often due to frozen debris inside the pipe outside your home.

High DIY-safe £80-150

What to check first

  1. Locate the plastic condensate pipe running outside from your boiler.
  2. Pour warm (not boiling) water slowly over the outside of the pipe to melt any ice blockage.
  3. Place a container underneath the end of the pipe to catch any water if it is frozen inside.
  4. Once the water flows freely, reset your boiler using the reset button on the front panel.

Parts commonly replaced

  • Condensate trap
  • Condensate siphon
Full explanation for Condensate Drain Blockage
Status & diagnostic codes

8 operating states & engineer diagnostics

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

2.3 Diagnostic Your boiler is struggling to maintain the correct gas pressure required to run efficiently, which is preventing it from firing up properly. 2.5 Diagnostic Your boiler is struggling to maintain the correct gas pressure required to keep the flame burning steadily for your heating and hot water. 6.0 Diagnostic Your boiler is struggling to maintain the correct gas pressure required to run properly, which usually prevents it from heating your water or home. 8.0 Diagnostic Your boiler is struggling to maintain the correct gas pressure required to heat your home properly, which means it will stop working until it is adjusted. 12.5 Diagnostic Your boiler is displaying a technical pressure setting that is not meant for user adjustment and indicates that the burner is not operating within its required parameters. 14 Diagnostic Your boiler is struggling to maintain the correct gas pressure required for it to run safely and efficiently. 36.0 Diagnostic Your boiler is struggling to maintain the correct gas pressure for the burner, which prevents it from heating your home or water safely. 36.5 Diagnostic Your boiler is struggling to maintain the correct gas pressure required to run efficiently, which means it may fail to heat your home or water properly.