BoilerFaultCodes Err
User interface fault
Glow-worm Ultracom 2 30sxi Fault codes & diagnostics
33 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2010-present
GC Numbers 41-019-1441-019-14
Download the Glow-worm Ultracom 2 30sxi manual
PDF
Versions & GC numbers
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. 33 Unrated
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 |
|---|---|---|
| 41-019-14 | Ultracom 2 30sxi | 2010–present |
| 41-019-14 | Ultracom 2 30sxi | 2010–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 Ultracom 2 30sxi faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 33 documented codes
Tap any card for details
F00
Flow heating temperature sensor fault: Sensor open circuit
F01
Return heating temperature sensor fault: Return heating temperature sensor disconnected
F10
Flow heating temperature sensor fault: Sensor short-circuit
F11
Return heating temperature sensor fault: Return heating temperature sensor shorted
F20
Overheating fault: Overheating safety device activated (97°C)
F22
Water pressure of the installation (<0.3 bar): Return water valve closed, Pump disconnected, Leak in the installation
F23
Maximum temperature difference reached between return and flow heating: Water circulation fault
F24
Water circulation fault: Malfunction of the pump (excessively rapid temperature increase)
F26
Fault in gas valve motor: Disconnected or defective cables
Showing 11–20 of 33
F27
Flame detection fault: Abnormal flame detection
F28
Burner fails to ignite
F29
Loss of flame during operation
F32
Incorrect air pressure: Incorrect fan speed
F49
EBUS voltage fault: Fault in EBUS line, Short circuit in EBUS connector
F61
Fault in the main board: Gas valve command fault
F62
Gas valve closure fault
F63
Fault in the main board memory
F64
Rapid fluctuation of return or flow heating sensor
F65
Excessive main board temperature
Showing 21–30 of 33
F67
Flame signal fault in the main board
F68
Fluctuation of flame signal: No return gas / Insufficient gas flow, Gas valve incorrectly adjusted, Defective firing electrode and flame control / Defective igniter unit
F70
User interface incompatible with the main board: Incorrect product code
F71
Flow heating temperature sensor fault: Flow heating temperature sensor unclipped or defective (no temperature variation)
F72
Permanent temperature difference between flow and return heating sensors: Mismatch between the flow and return heating temperatures (permanent difference)
F73
Heating circuit pressure sensor fault: The sensor is shorted or disconnected
F74
Heating circuit pressure sensor fault: Fault in pressure sensor
F76
Thermal fuse fault: Thermal fuse disconnected, Defective thermal fuse
F77
Fault in gas valve motor: Defective gas valve, Defective condensate pump (option)
F83
No water in the installation : the temperature does not increase when the burner is lit
Showing 31–33 of 33
F84
Permanent temperature difference between flow and return heating sensors
F85
Flow and return heating sensors fault
F86
Underfloor heating contact fault
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