BoilerFaultCodes
Glow-worm Boiler Fault Codes
1,400 fault codes across 47 Glow-worm boiler models — explained in plain English.
UK boiler brand owned by Vaillant Group. Popular budget-to-mid-range option.
Just want the most common Glow-worm problems?
The top 8 faults across the whole Glow-worm range — causes, DIY checks, repair costs.
High-severity Glow-worm fault codes
F.00 F.10 F.11 F.12 F.91
Your boiler has stopped working because it cannot accurately measure the temperature of the water leaving the unit to heat your home.
Energy
Your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water leaving the unit, causing it to shut down for safety.
Energy
Your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water used for your heating, causing the system to shut down for safety.
Energy
Your boiler has lost its ability to monitor the temperature of your hot water cylinder because a sensor has developed an electrical fault.
Energy
Your boiler has lost its ability to monitor the temperature of your hot water cylinder because a sensor has developed an electrical fault.
Energy
All models
47 Glow-worm boiler models
Energy
CombiSystemRegular
30ci Plus
Combi Discontinued
Glow-worm Fuelsaver 56 3E
Regular Discontinued
Betacom
Combi Discontinued
Flexicom 18sx
System Discontinued
Flexicom cx
Combi Discontinued
Fuelsaver Complheat 40 55
Regular Discontinued
Hideaway 40B
Regular Discontinued
Glow-worm Micron 100FF 120FF
Regular Discontinued
Micron 30ff
Regular Discontinued
Space Saver 30 40 50
Regular Discontinued
Space Saver Compleheat 30 40 50
Regular Discontinued
Swift Flow 100
Combi Discontinued
Ultracom 24cx 30cx
Combi Discontinued
Xtrafast 96 120
Combi Discontinued
Xtramax HE
Combi Discontinued
Energy System
System
Energy Heat
System
Betacom C
Combi Discontinued
Compact
Combi Discontinued
Ultracom 2 CXI
Combi Discontinued
Ultracom 2 SXI
Combi Discontinued
Ultracom 2 HXI
System Discontinued
Ultracom cxi
Combi Discontinued
Ultracom sxi
System Discontinued
Ultracom hxi
System Discontinued
Ultracom 35 Store
Combi Discontinued
Flexicom hx
System Discontinued
Flexicom sx
System Discontinued
Xtrafast 96
Combi Discontinued
Xtrafast 120
Combi Discontinued
Ci Range
Combi Discontinued
Ci Plus
Combi Discontinued
CXi
Combi Discontinued
Ultimate3
Combi Discontinued
HXi
System Discontinued
Micron 40FF
Regular Discontinued
Micron 50FF
Regular Discontinued
Micron 60FF
Regular Discontinued
EnergySaver
Regular Discontinued
EnergySaver Combi
Combi Discontinued
Ultimate
System Discontinued
Space Saver
Regular Discontinued
Hideaway 80
Regular Discontinued
Hideaway 100
Regular Discontinued
30cxi
Combi Discontinued
38cxi
Combi Discontinued