BoilerFaultCodes A.5
Can be seen, but not working
Glow-worm Energy 35 Store Fault codes & diagnostics
81 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2015-present
GC Number 47-019-37
Download the Glow-worm Energy 35 Store 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. 81 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 |
|---|---|---|
| 47-019-37 | Energy 35 Store | 2015–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 Energy 35 Store faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 81 documented codes
Tap any card for details
F.00
Flow temperatures sensor interruption
F.01
Return temperatures sensor interruption
F.02
Cylinder charging sensor fault
F.03
Cylinder sensor fault
F.10
Flow NTC short circuit
F.11
Return NTC short circuit
F.12
Cylinder charging sensor short circuit
F.13
Cylinder sensor short circuit
F.20
Safety switch-off: Temperature limiter
Showing 11–20 of 81
F.22
Safety switch-off: Low water pressure
F.23
Safety switch-off: Temperature difference too great
F.24
Safety switch-off: Temperature rise too fast
F.26
Fault: Gas valve without function
F.27
Safety switch-off: Recording incorrect flames
F.28
Failure during start-up: Ignition unsuccessful
F.29
Failure during operation: Re-ignition unsuccessful
F.32
Fan fault
F.42
Coding resistance fault (possibly in connection with F.70)
F.49
Fault: eBUS
Showing 21–30 of 81
F.52
Mass flow sensor connection fault
F.53
Mass flow sensor fault
F.54
Gas pressure fault (in combination with F.28/F.29)
F.56
Fault: Mass flow sensor regulation
F.57
Fault during comfort safety mode
F.61
Gas valve actuation fault
F.62
Gas valve fault. Switch-off delay
F.63
EEPROM fault
F.64
Fault: Electronics/NTC
F.65
Fault: Electronics temp.
Showing 31–40 of 81
F.67
Fault: Electronics/flame
F.68
Fault: Unstable flame signal
F.70
Invalid product identification (DSN)
F.71
Heating flow temperature sensor fault
F.72
Flow/return NTC fault
F.73
Water pressure sensor signal in the wrong range (too low)
F.74
Water pressure sensor signal in the wrong range (too low)
F.77
Fault: Flue non-return flap/condensate pump
F.79
Cylinder temperature sensor fault
F.81
Hot water circuit overheating
Showing 41–50 of 81
F.83
Fault: Flow and/or return temperature sensor temperature change
F.84
Fault: Flow/return temperature sensor temperature difference implausible
F.85
Fault: Flow and return temperature sensors incorrectly installed
F.86
Fault: Flo
F22
The product switches off as soon as the water pressure reaches the operating value.
S.00
No demand.
S.01
Fan start-up.
S.02
Pump start-up.
S.03
Burner ignition.
S.04
Burner ignited.
Showing 51–60 of 81
S.05
Pump/fan overrun.
S.06
Fan overrun
S.07
Pump overrun.
S.08
Remaining burner anti-cycling time.
S.10
DHW demand.
S.11
Fan start-up.
S.13
Burner ignition.
S.14
Burner ignited.
S.15
Pump/fan overrun.
S.16
Fan overrun.
Showing 61–70 of 81
S.17
Pump speed overrun.
S.20
DHW demand.
S.21
Fan start-up.
S.23
Burner ignition.
S.24
Burner ignited.
S.25
Pump/fan overrun.
S.26
Fan overrun.
S.27
Pump overrun.
S.28
Burner anti-cycling time or lock against short cycles.
S.30
Room thermostat is blocking heating mode.
Showing 71–80 of 81
S.31
Summer mode active or no heat requirement from the eBUS controller.
S.32
Waiting mode because of fan speed deviation.
S.34
Frost protection mode active.
S.39
Underfloor heating contact open.
S.40
Comfort protection mode is active: Product running with limited heating comfort. For example, underfloor heating (contact thermostat).
S.41
Water pressure too high.
S.53
Wait cycle: Temperature difference between heating flow and return is too high. If Δt > 30, then forced operation with Pmin.
S.54
Product is in the waiting period of the operation blocking function as a result of low water pressure (temperature gradient).
S.96
Water pressure sensor test running, heating demands are blocked.
S.98
Test of the heating return temperature sensor.
Showing 81–81 of 81
S.99
Automatic filling in progress.
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