Worcester Bosch is the UK's most popular boiler brand, accounting for 1 in 3 installations. When lockout faults occur, repair costs vary widely based on the error code, parts needed, and labour rates. Here's your complete 2026 pricing guide.
Worcester Bosch lockout repairs cost £85-£450 depending on the fault. Simple resets (EA codes) average £95, ignition failures £180-£280, and PCB replacements £350-£450.
Common Worcester Bosch Lockout Error Codes & Costs
| Error Code | Fault Description | Typical Fix | Average Cost |
|---|---|---|---|
| EA | Flame loss / Ignition failure | Ignition lead, electrode, gas valve | £180-£280 |
| E9/219 | No flame signal detected | Electrode replacement | £140-£220 |
| D5 | Internal control error | PCB replacement | £350-£450 |
| A1/227 | Frozen condensate pipe | Thaw + insulation | £85-£150 |
| C6 | Fan fault / Speed sensor | Fan replacement | £280-£400 |
| E2 | Thermistor fault (overheat) | Thermistor replacement | £120-£180 |
| 1P | Low water pressure | Repressurise system | £75-£120 |
| E5/E25 | Overheat / Flow temp sensor | Sensor replacement | £110-£170 |
Worcester Bosch Repair Cost Breakdown
Callout Fee
Standard daytime callout. Some companies waive if you proceed with repair.
Diagnostic
Error code analysis and fault identification. Often included in labour charge.
Labour
Gas Safe engineer hourly rate. Most lockout repairs take 45mins-2hours.
Parts
Genuine Worcester parts. Prices vary: electrodes £25, PCBs £180-£250.
Real Worcester Bosch Repair Examples
Example 1: EA Code - Ignition Lead Fault (Greenstar 30CDi)
- Callout fee: £75
- Diagnostic: £50
- Ignition lead (part): £45
- Labour (1 hour): £65
- Safety check: Included
Example 2: D5 Code - PCB Replacement (Greenstar 25Si)
- Callout fee: £85
- Diagnostic: £60
- PCB unit (part): £220
- Labour (1.5 hours): £95
- System test: £15
Example 3: A1 Code - Frozen Condensate (Greenstar 30i)
- Callout fee: £65 (waived)
- Thaw condensate pipe: £40
- Insulation kit (part): £15
- Labour (30 mins): £35
Warranty vs Out-of-Warranty Repairs
Under Warranty (1-10 years)
- Parts: Free (covered by Worcester Bosch)
- Labour: Free if installed by Worcester Accredited Installer
- Callout: £0 (must use approved engineer)
- Conditions: Annual service required
- Average Total Cost: £0-£0
Out-of-Warranty
- Parts: Full cost (£20-£250)
- Labour: £50-£90/hour
- Callout: £60-£95
- Choice: Any Gas Safe engineer
- Average Total Cost: £120-£450
Worcester Bosch Parts Prices (2026)
Electrodes & Ignition Leads
Common wear items. Electrode £25-£35, ignition lead £40-£50. Relatively cheap parts but essential for ignition.
Thermistors & Sensors
Flow temperature sensors £65-£85, return sensors £60-£75. Often fail in older boilers (10+ years).
Gas Valve
Controls gas flow to burner. Failure causes EA lockout. Genuine Worcester part £110-£145 fitted.
PCB (Printed Circuit Board)
The boiler's "brain." Most expensive single component. Failure shows D5 or similar error codes.
Fan Assembly
Extracts flue gases. C6 error indicates fan fault. Includes motor and housing.
Pump
Circulates water through system. Seizure or bearing failure causes lockout. Grundfos pumps common.
Some engineers use cheaper non-genuine parts. These void warranty and often fail prematurely. Always insist on genuine Worcester Bosch components—ask to see packaging.
Regional Price Variations (UK)
Worcester Bosch lockout repair costs vary by location:
Lancashire rates are 18% below London for the same repair. Parts cost the same UK-wide—labour and callout differences drive regional pricing.
How to Reduce Worcester Bosch Repair Costs
Try Reset First
Many lockouts (especially EA codes) resolve with a simple reset. Press reset button for 3 seconds—free fix for 20% of faults.
Check Manual
Your Worcester manual explains error codes. Some (like low pressure) are DIY fixes—no engineer needed.
Thaw Frozen Pipes
A1/227 codes are often frozen condensate. Pour warm (not boiling) water over pipe—saves £85 callout.
Get Multiple Quotes
For non-emergencies, call 2-3 engineers. Quotes for same job can vary £100+. Compare labour rates.
Annual Service Plan
£15-£25/month plans include free callouts and 20% off parts. Pays for itself if you need 1 repair/year.
Use Worcester Accredited Installer
If under warranty, MUST use approved engineer or warranty voids. Find yours on worcester-bosch.co.uk
When to Repair vs Replace
The 50% Rule
If repair costs over 50% of new boiler value, consider replacement. Example: £450 PCB repair on 12-year-old boiler worth £900 used → better to replace with new 10-year warranty boiler (£1,800 fitted).
Repair Makes Sense When:
- Boiler under 7 years old
- Repair cost under £250
- Warranty still active
- Recent service history excellent
- Simple component failure (not PCB/heat exchanger)
Consider Replacement When:
- Boiler over 12 years old
- Repair quoted over £400
- Multiple failures in past 2 years
- Efficiency rating under 85% (costing you £££ in bills)
- Parts becoming obsolete/hard to source
FAQs: Worcester Bosch Lockout Costs
Why are Worcester Bosch repairs more expensive than other brands?
They're not inherently pricier—parts cost similar to Vaillant or Ideal. Perception comes from popularity: more Worcester boilers = more Worcester repairs reported. Quality genuine parts do cost more than cheap pattern parts for budget brands.
Can I buy Worcester Bosch parts myself online?
Yes, but fitting requires Gas Safe registration. Many critical parts (gas valves, PCBs) involve gas work—illegal and dangerous for DIYers. Non-gas parts (pumps, sensors) are technically allowed but you risk incorrect fitting.
How long do Worcester Bosch repairs typically take?
Simple fixes (electrodes, resets): 30-60 minutes. Component replacements (gas valves, pumps): 1-2 hours. PCB or fan replacements: 2-3 hours including testing.
Is it worth paying for Worcester Bosch extended warranty?
Depends. If you had the free 2-5 year warranty, extension (5→10 years) costs £200-£300. Good value if major component fails (PCB, heat exchanger) but most boilers run fine 5-10 years. Boiler cover insurance may be better value.
Find Worcester Bosch Specialists in Lancashire
Our directory lists Gas Safe engineers experienced with Worcester Bosch lockout faults. Many offer fixed-price repairs and transparent quotes.
Find Worcester Bosch Engineers