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Glow-worm specialists · Gas Safe 599015 · F75 experts · Wokingham & RG40

Glow-worm Boiler Support — Wokingham

Flexicom, Ultracom, Energy & Betacom — fault codes, manuals & local repairs across Wokingham and RG40

Whether your Glow-worm boiler is showing an F22, F1 or the notorious F75 fault code, needs its annual service, or has broken down entirely — Thermotec is Wokingham’s local Gas Safe specialist. Fixed prices, exact arrival times, same-day where available.

£96
Service &
diagnostic
90%
First-time
fix rate
Same day
Where
available
120+
5★ Google
reviews
Need Glow-worm help today?
Repairs · Servicing · Fault codes · RG40
Annual serviceFrom £96
Diagnostic fee£96 fixed
First-time fix90%
Quick fault lookup

Most common Glow-worm fault codes

These are the codes Wokingham homeowners report most often. See the full fault code guide for the complete index.

F1
Ignition fault
Boiler failed to ignite. Check gas supply. Check condensate pipe for ice in winter. Press Reset. If it returns, engineer needed.
F22
Low water pressure
Pressure below minimum. Repressurise to 1.5 bar using the filling loop. If pressure keeps dropping, hidden leak — engineer required.
F75
Pump / pressure sensor fault
Most common Glow-worm fault. Pump not detected on startup, or faulty pressure sensor. Often caused by sludge. See dedicated F75 guide.
F28
Ignition lockout
Ignition attempted and failed repeatedly. Gas supply, faulty electrode or frozen condensate. Do not keep resetting — engineer needed.
F29
Flame loss lockout
Flame detected then lost during operation. Gas valve, sensor or combustion issue. Engineer diagnosis required.
F32
Fan fault
Fan not running correctly — prevents safe flue venting. Do not reset repeatedly. Gas Safe engineer required immediately.
F75 — Glow-worm’s most common fault in Wokingham
The F75 is the fault code we see most on Glow-worm boilers across RG40. It appears when the pump isn’t detected on startup, or when the pressure sensor can’t confirm the pump is running. In Wokingham’s hard water area, the cause is often magnetic sludge restricting pump movement. We have a dedicated specialist guide covering every cause, every fix and when to replace vs repair.
Read the full F75 specialist guide →
Models we support

Glow-worm range — all models covered

Thermotec services, repairs and diagnoses all current and older Glow-worm models across Wokingham and RG40. Manuals available for download for every model.

Energy Combi
Current range
Current-generation combi. ErP compliant, efficient and compact. F75 and F22 are the most common codes on this model.
Fault code guide → Download manual (PDF) →
Ultimate3 Combi
Current range
Premium current-generation combi with advanced controls. F75 pump fault common where system sludge is present.
Fault code guide → Download manual (PDF) →
Energy System
System boiler
System boiler for properties with hot water cylinders. F22 low pressure and F75 pump faults are most frequently reported.
Fault code guide → Download manual (PDF) →
Betacom4
Combi
Reliable mid-range combi. F1 ignition and F75 pump faults are common as these units age in hard water areas.
F75 specialist guide → Download manual (PDF) →
Easicom3
Combi
Popular budget combi. Straightforward to service. F22 pressure loss and F1 ignition faults are the most reported issues.
Fault code guide → Download manual (PDF) →
Compact Combi
Older model
Older compact combi. Still common in Wokingham homes. Parts availability checked before service or repair is quoted.
Fault code guide → Download manual (PDF) →
Ultracom2
Older model
Older Ultracom range combi. Diverter valve and pump issues common on these models. F75 very frequently reported.
F75 specialist guide → Download manual (PDF) →
Flexicom CX
Older model
Older Flexicom range. Still serviced across Wokingham. F75 is the most common fault on this range in hard water areas.
F75 specialist guide → Download manual (PDF) →
Coverage

Glow-worm support across Wokingham & Berkshire

Based in Arborfield — 10 minutes from Wokingham town centre. Covering RG40, RG41, RG2, RG5, RG6 and RG45.

Glow-worm issue? Call Stuart.

Gas Safe 599015 · £96 fixed diagnostic · Annual service from £96 · F75 specialists · Same-day where available · Wokingham & RG40