BoilerFaultCodes.com

Glow-worm Compact 100 Fault Codes

Combi Natural Gas 29.3 kW 1997-2003 Discontinued
GC Number: 47-313-10

Replaced by: Flexicom cx

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 →

Most common fault codes

F
Your boiler has stopped working as a safety precaution, often due to an issue with the gas supply or a failure to light the burner.
May be DIY safe · £120-350
G
Your boiler has detected that the water pressure is too low for the system to run safely and has stopped working to protect itself.
May be DIY safe · £0-120
H
Your boiler has detected that the water pressure is too low for it to operate safely and effectively.
May be DIY safe · £0-120

All 10 fault codes

Code Severity Plain English
D Low Your boiler is operating normally and is simply confirming that the burner has successfully lit to provide heat or hot water.
E Low Your boiler is receiving electrical power and is currently in its standard standby mode, ready to operate when you turn on the heating or hot water.
F High Your boiler has stopped working as a safety precaution, often due to an issue with the gas supply or a failure to light the burner.
G High Your boiler has detected that the water pressure is too low for the system to run safely and has stopped working to protect itself.
H High Your boiler has detected that the water pressure is too low for it to operate safely and effectively.
K Low Your boiler is currently set to its winter mode, meaning it is prepared to provide both central heating and hot water as normal.
L Low Your boiler is currently set to summer mode, which means it will provide hot water but the central heating is switched off.
Low water pressure LED flash High Your boiler has detected that there is not enough water in the heating system to operate safely.
P Low Your boiler is simply showing you that it is currently busy heating up the water for your taps or shower.
Q Low Your boiler is simply indicating that it is currently operating to provide heat to your radiators.

Glow-worm Compact 100 is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

UK's #1 online installer
Boxt
Fixed-price online quotes. Next-day installation.
Get a free quote →
Heatable
Instant online boiler quotes from £1,499.
Get a free quote →
iHeat
Fast installation. Price match guarantee.
Get a free quote →

Affiliate links — we may earn a commission at no extra cost to you.