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Worcester Bosch specialists across Wokingham · Arborfield · Finchampstead · Earley · Woodley · Winnersh · Shinfield · RG40 · RG41

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Worcester Bosch specialists · Gas Safe 599015 · RG40

Worcester Bosch support · Wokingham & RG40

Worcester Boiler Support & Fault Codes — Wokingham

Greenstar i, CDi Classic, Si Compact, 8000 Life & Ri — fault codes, annual servicing, manuals & local repairs across RG40

Whether your Worcester boiler is showing an EA or A1 fault code, needs its annual service, or has broken down entirely — Thermotec is Wokingham’s Worcester Bosch specialist. Over 20 years experience across the full Greenstar range. Fixed prices, exact arrival times, 90% first-time fix rate. Calls answered 24/7.

Book Online 24/7 Call 07850 116944

£96

Service &
diagnostic

90%

First-time
fix rate

20+

Years
experience

130+

5★ Google
reviews

Need Worcester Bosch help today?

Repairs · Servicing · Fault codes · RG40

Calls answered 24/7 · Stuart follows up first thing

Annual serviceFrom £96

Diagnostic fee£96 fixed

First-time fix90%

Google reviews130+ ★

Book Online 24/7 07850 116944

★★★★★

130+ five-star Google reviews from homeowners across Wokingham, Earley, Shinfield and RG40

Gas Safe 599015 £96 fixed diagnostic 90% first-time fix Greenstar specialists Calls answered 24/7

What do you need?

Fault codes or annual servicing?

Fault code guide

Worcester Fault Codes

EA, A1, C6, C7, U9 and more — full Greenstar fault code index with severity ratings, DIY fixes and step-by-step reset guidance for all models.

EA, A1, C6 — full code index → 10 common faults explained → When to call an engineer →

Diagnostic from £96

Annual servicing

Worcester Boiler Service

Annual service by a Worcester Bosch specialist — Gas Safe registered, digital Benchmark record issued same day, warranty-compliant. From £96 fixed price.

What’s included in the service → Warranty protection explained → Book your exact time online →

From £96 · Fixed price

Quick fault lookup

Most common Worcester fault codes

These are the codes Wokingham homeowners report most often. Find yours below — or see the full fault code guide for the complete index.

No flame detected

Check gas supply. Check condensate pipe for ice in winter. Press Reset 3–5 sec. If it returns, ignition electrode likely faulty.

Low pressure / pump fault

Repressurise to 1.5 bar using filling key. If pressure keeps dropping, hidden leak or expansion vessel — engineer required.

Fan speed error

Do not reset repeatedly. Fan fault prevents safe venting — Gas Safe engineer required.

Fan not operating

Common on Si Compact models. Immediate engineer inspection required — harmful gases cannot be safely vented.

202

Anti-cycle mode

Not a fault. The boiler is resting to prevent overheating. Wait 15 minutes — it will restart automatically.

Overheating lockout

Turn off at the wall immediately. Pump or heat exchanger fault — engineer inspection required.

View full fault code guide →

Models we support

Worcester Bosch Greenstar range — all models covered

Thermotec services, repairs and diagnoses all current and recent Greenstar models across Wokingham and RG40. Genuine Bosch parts carried on the van.

Greenstar i Combi

Most common in RG40

The UK’s best-selling combi boiler. Compact, reliable, smart home compatible. Most common fault: EA ignition lockout.

EA fault code guide → Download manual (PDF) →

CDi Classic Combi

Mid-range combi

Reliable mid-range combi. Diverter valve issues common on older units. A1 code indicates pressure or pump fault.

A1 fault code guide → Download manual (PDF) →

Greenstar Si Compact

Space-saving combi

Ultra-compact wall-mounted combi. C7 fan fault is the most common issue on this model — requires immediate engineer attention.

C7 fault code guide → Download manual (PDF) →

Greenstar 8000 Life

Premium smart combi

Premium combi with touchscreen Vitotronic-style control. Code 202 (anti-cycle) is normal behaviour — not a fault. Reset via digital menu.

8000 fault code guide → Download manual (PDF) →

Greenstar Ri / Junior

Regular / heat-only

Heat-only boiler for properties with hot water cylinders. Slow flashing light = general ignition lockout. Press reset; if fault returns, engineer needed.

Ri fault code guide → Download manual (PDF) →

Greenstar 4000

Current generation combi

Current-generation combi with ErP compliance and smart connectivity. EA and C6 are the most common fault codes on this model.

Greenstar 4000 fault codes → Download manual (PDF) →

PDF manuals

Download Worcester Bosch manuals

User, installation and servicing manuals for all major Greenstar models. Click to download direct.

PDF

Greenstar i Combi

User & installation manual

PDF

Greenstar 8000 Life

Installation & maintenance

PDF

CDi Classic Combi

Installation & servicing

PDF

Greenstar Si Compact

Operating instructions

PDF

Greenstar 4000

User & installation manual

PDF

Greenstar Ri / Junior

Installation & servicing

Why choose Thermotec

Wokingham’s Worcester Bosch specialist

Local, Gas Safe registered, over 20 years of Greenstar experience. We carry genuine Bosch parts for the most common faults so we can fix most issues in a single visit.

Worcester Bosch specialists

In-depth knowledge of the full Greenstar range — from the i Combi to the 8000 Life. We diagnose faults precisely rather than parts-swapping.

Genuine Bosch parts

We only fit manufacturer-approved parts. Common items — diverter valves, electrodes, pumps — are carried on the van for same-visit fixes.

Same-day where available

Based in Arborfield, 10 minutes from Wokingham town centre. We prioritise total heating and hot water failures for fast response across RG40.

Fixed upfront pricing

£96 fixed diagnostic fee. Repair quoted upfront before parts are ordered. No hidden hourly rates or surprise costs.

Gas Safe Reg. 599015

Fully qualified, insured and Gas Safe registered. 130+ five-star Google reviews from homeowners across Wokingham and Berkshire.

Exact arrival times

Book online 24/7 and Stuart arrives when he says he will — not a 6-hour window. Calls answered 24/7; Stuart follows up out-of-hours messages first thing.

Common questions

Worcester Bosch boiler FAQ

What does the EA fault code mean on a Worcester Bosch boiler?

EA means no flame was detected — the boiler tried to ignite and failed. Check your gas supply is live, check the condensate pipe for ice in winter, then press Reset for 3–5 seconds. If EA returns immediately, the ignition electrode is likely faulty and a Gas Safe engineer is needed. Full fault code guide →

What does the A1 fault code mean on a Worcester Bosch boiler?

A1 indicates low pressure or a pump fault. Repressurise to 1.5 bar using the filling key under the boiler. If pressure keeps dropping more than twice a year, there is likely a hidden leak or failing expansion vessel — a Gas Safe engineer is needed to find the cause.

What does the C6 fault code mean on a Worcester Bosch boiler?

C6 is a fan speed error. Do not reset repeatedly — fan faults prevent safe venting of combustion gases. A Gas Safe engineer is required immediately. C7 (fan not operating) on the Si Compact model is equally urgent. Full fault code guide →

How much does a Worcester Bosch boiler service cost in Wokingham?

Thermotec charges from £96 fixed price for a Worcester Bosch annual service in Wokingham, including a full safety check, combustion analysis, internal clean and digital Benchmark record. Landlord CP12 and service combined is £150. All prices confirmed before the visit.

Do you have Worcester Bosch manuals for download?

Yes — Thermotec provides downloadable PDF manuals for all major Worcester Bosch Greenstar models including the i Combi, 8000 Life, CDi Classic, Si Compact, Greenstar 4000 and the Ri/Junior. See the manuals section above.

Can you repair older Worcester Bosch models?

Yes — Thermotec services and repairs all Greenstar models including older CDi Classic and i Combi units across Wokingham and RG40. Parts availability is checked before any repair is quoted on older units.

Coverage