BoilerFaultCodes Err
User interface fault
Glow-worm Betacom2 28 Fault codes & diagnostics
58 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2012-present
GC Number 47-019-17
Download the Glow-worm Betacom2 28 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. 58 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 |
|---|---|---|
| 47-019-17 | Betacom2 28 | 2012–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 Betacom2 28 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 58 documented codes
Tap any card for details
F00
Flow heating temperature sensor fault
F01
Return heating temperature sensor fault
F10
Flow heating temperature sensor fault
F11
Return heating temperature sensor fault
F20
Overheating fault
F22
Water pressure of the installation (<0.3 bar)
F23
Maximum temperature difference reached between return and flow heating
F24
Water circulation fault
F26
Fault in gas valve motor.
Showing 11–20 of 58
F27
Flame detection fault.
F28
The burner fails to ignite
F29
Loss of flame during operation
F32
Incorrect air pressure
F49
EBUS voltage fault
F61
Fault in the main board
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 58
F67
Flame signal fault in the main board
F68
Fluctuation of flame signal
F70
User interface incompatible with the main board
F71
Flow heating temperature sensor fault
F72
Permanent temperature difference between flow and return heating sensors
F73
Heating circuit pressure sensor fault
F74
Heating circuit pressure sensor fault
F76
Thermal fuse fault
F77
Fault in gas valve motor
F83
No water in the installation : the temperature does not increase when the burner is lit
Showing 31–40 of 58
F84
Permanent temperature difference between flow and return heating sensors
F85
Flow and return heating sensors fault
F86
Underfloor heating contact fault
S.00
No request for heating
S.01
Pre-run fan
S.02
Pre-run pump
S.03
Ignition
S.04
Burner lit
S.05
Post run pump/fan
S.06
Post run fan
Showing 41–50 of 58
S.07
Post run pump
S.08
Time delay anti short-cycles after heating
S.10
Request for domestic hot water
S.11
Pre-run fan
S.13
Ignition
S.14
Burner lit
S.15
Post run pump/fan
S.16
Post run fan
S.17
Post run pump
S.30
Default status, no request for heating or domestic water. If an EBUS controller is connected to the boiler, check that a wiring link is present on terminals 3 and 4 of the boiler's main board.
Showing 51–58 of 58
S.31
"Hot water only" mode
S.32
Control cycle: the speed of the fan in the functioning phase is outside tolerance.
S.34
"Frost protection" mode
S.41
Water pressure too high
S.53
Waiting cycle: temperature differential between heating flow and return is too high. If ∆T > 30, forcing to Pmin.
S.54
Waiting cycle: lack of water in the installation/temperature rise between heating flow and return is too high.
S.96
Test temperature sensor for heating return.
S.98
Test temperature sensors for heating flow and return, or the appliance has a fault.
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