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Worcester Bosch EA Fault Code Repair Cost: What to Expect?
Last Updated: November 3, 2026
Quick Summary
Worcester Bosch EA fault code repair cost typically ranges from £60 to £360 depending on the failed component. A dirty flame sensor or blocked condensate is the cheapest fix at £60-£140, while a faulty gas valve is the most expensive at £170-£360. Always confirm whether quotes include VAT and a separate diagnostic charge.
- An EA fault code means the boiler has tried to ignite and failed to detect a flame.
- Ignition failure is the most common trigger for the EA code.
- Ask for the parts and labour split in writing before work starts.
- A low headline call-out fee often hides a separate diagnostic charge.
- If the same fault recurs more than twice in a heating season, replacement usually wins.
Table of Contents
- Worcester Bosch EA Fault Code Meaning
- Worcester Bosch EA Fault Causes and What Each One Costs to Fix
- Worcester Bosch Boiler Repair Cost: Itemised Price Breakdown
- Call-Out, Diagnostic and Follow-Up Charges Explained
- Worcester Bosch Out of Guarantee Repair vs Independent Engineer
- Intermittent EA Faults, Boiler Age and Repair vs Replacement
- Booking a Gas Safe Engineer for Your EA Fault
- Frequently Asked Questions
Worcester Bosch EA Fault Code Meaning
An EA fault code on a Worcester Bosch boiler means the boiler has tried to ignite and failed to detect a flame. In plain terms, the burner fires, the flame sensor sees nothing, and the boiler locks out to stop unburnt gas building up. That safety shut-off is deliberate, and it is why the boiler will not restart until someone resets it and the underlying cause is found.
This guide from Central Heating Scotland explains what drives the cost of a Worcester Bosch EA fault repair, how call-out and diagnostic charges are typically structured, and when replacement may be worth considering. The fault code tells you little about price until an engineer identifies which component has failed.
The Gas Safe Register is the official body that licenses gas engineers in the UK. Any work on the gas side of your boiler, including the gas valve and burner assembly, is legally restricted to a Gas Safe registered engineer.
Worcester Bosch EA Fault Causes and What Each One Costs to Fix
Several common causes can produce an EA lockout: a failed ignition, a dirty or worn flame sensor, an interrupted gas supply, a faulty gas valve, or a blocked condensate pipe. Each has a different repair profile, and that difference is what drives the final bill.
Ignition and Flame Detection Faults
Ignition failure is the most common trigger for the EA code. The electrode that sparks the burner can corrode, crack, or drift out of position, so the spark never reaches the gas.
Flame detection faults are the trickier cousin. A flame sensing electrode coated in carbon cannot read the flame even when the burner lights perfectly. Cleaning it can solve the problem, which is why diagnosis matters before parts are replaced.
Gas Supply, Gas Valve and Condensate Problems
A gas supply interruption can mimic a component failure. If the meter has been isolated, credit has run out on a prepayment meter, or another appliance is starving the boiler of gas pressure, the boiler will attempt ignition and fail.
A faulty gas valve is a genuine parts failure and one of the more expensive repairs on a Worcester Bosch. Blocked condensate is the cheapest of the five, usually cleared by flushing the trap and pipe run.
If your boiler has stopped entirely, our broken boiler repair service covers the faults described here.
Worcester Bosch Boiler Repair Cost: Itemised Price Breakdown
Worcester Bosch boiler repair cost varies by fault, not by boiler model, and the parts-versus-labour split explains most of the variation. Pricing for EA-related repairs depends on the specific fault, parts required and the engineer's assessment on site. For a current price or a quote for your boiler, please contact Central Heating Scotland directly.
| Likely fault | Typical work involved | Typical parts cost (GBP) | Typical labour (GBP) | Typical total (GBP) |
|---|---|---|---|---|
| Dirty flame sensor | Clean and test | £0-£15 (cleaning only) | £60-£120 | £60-£135 |
| Ignition electrode | Clean, reposition or replace | £15-£45 | £60-£150 | £75-£195 |
| Blocked condensate | Flush trap and pipe run | £0-£20 | £60-£120 | £60-£140 |
| Interrupted gas supply | Restore supply, re-test pressure | £0 | £60-£120 (diagnostic only) | £60-£120 |
| Faulty gas valve | Replace valve, safety checks | £80-£180 | £90-£180 | £170-£360 |
Always confirm with the engineer whether a quote includes VAT and whether any call-out or diagnostic charge is separate from the repair price.
Ask for the parts and labour split in writing before work starts, and ask whether the diagnostic charge is deducted from the repair if you go ahead.
For the wider fault-code picture, see our boiler fault code repair service.
Call-Out, Diagnostic and Follow-Up Charges Explained
Most emergency boiler bills break into three parts: a call-out fee, a diagnostic charge, and the repair itself. The call-out covers attendance, the diagnostic covers the engineer's time identifying the fault, and the repair covers parts plus labour. Some firms fold all three into one price; others itemise them, which is fairer because you can see what you are paying for.
Watch out: a low headline call-out fee often hides a separate diagnostic charge that only appears on the invoice. Ask upfront whether the quoted fee includes diagnosis and whether VAT is included.
Before you book, it helps to understand how emergency boiler repair costs are structured.
Worcester Bosch Out of Guarantee Repair vs Independent Engineer
The word to interrogate is "most". A fixed-price repair is only fixed for the faults the scheme defines as covered. Before booking, ask the manufacturer's team three questions in writing: which components are excluded from the fixed price, whether a second visit for the same fault is charged again, and whether the price changes if the engineer finds a fault outside the covered list. A common pattern is that the headline price holds for electrodes, sensors, gas valves and condensate work, but a heat exchanger or main PCB failure moves the job into a different pricing band. Get that confirmed before you pay.
When comparing options, ask any engineer for their Gas Safe licence card and check the number on the register before work begins, and ask for the quote to state whether it includes VAT, the call-out, the diagnostic, parts, labour and any return visit.
When comparing quotes, compare the total cost including VAT, call-out, diagnostic, parts and labour, not the headline figure.
Either way, get the coverage limits and what a quote includes in writing before you commit.
Intermittent EA Faults, Boiler Age and Repair vs Replacement
An EA code that appears, clears on reset, then returns weeks later is the most frustrating version of this fault. Intermittent faults usually point to a marginal component, often a sensor drifting out of tolerance or an electrode that sparks only when cold. Expect a longer diagnostic and possibly a return visit, and budget for that uncertainty rather than assuming one visit will settle it.
Boiler age sets the repair-versus-replacement threshold. As a working rule, if a single repair is likely to cost a large fraction of a new boiler's installed price, or if the same fault has recurred more than twice in a heating season, replacement usually wins on total cost. Our guide to repair versus replacement cost decisions walks through that calculation.
Booking a Gas Safe Engineer for Your EA Fault
Booking the right engineer matters more than booking the cheapest one. Confirm three things before you commit: the engineer is Gas Safe registered, the quote states whether the diagnostic charge is credited against the repair, and the firm covers your postcode. Central Heating Scotland provides Gas Safe registered engineers across Glasgow and West Scotland through our Worcester Bosch boiler service.
We recommend noting the fault code, the boiler model, and whether the boiler makes any noise before lockout. That information can help shorten diagnosis.
Frequently Asked Questions
What does the EA fault code mean on a Worcester Bosch boiler?
EA signals an ignition failure: the boiler is calling for flame but its flame-detection sensor is not registering one. The boiler locks out and stops firing, so you lose heating and hot water. It is not a fault you can diagnose from the code alone, because the same code appears whether the problem is the gas supply, dirty ignition electrodes, a faulty gas valve or a blocked condensate pipe. A Gas Safe engineer needs to test the boiler to establish which one applies before any repair cost can be confirmed.
How much does it cost to fix a Worcester Bosch EA fault?
The EA fault repair cost depends entirely on the cause. A clean and adjustment of the ignition electrodes sits at the lower end, while a replacement gas valve or printed circuit board pushes the bill considerably higher. Labour, VAT and the diagnostic charge all add to the total. Manufacturer out-of-guarantee repair options are available, and you can compare any quote against the total cost including VAT. Always ask for an itemised quote before work starts.
Can I fix a Worcester Bosch EA fault myself?
No. Anything inside the boiler case involving gas, the burner, the gas valve or the flame-detection circuit is legally restricted to a Gas Safe registered engineer. Working on a gas appliance without registration is an offence and voids your guarantee. You can safely try a boiler reset once, and you can check that the condensate pipe is not frozen in cold weather, but if the EA code returns after a reset, stop and book an engineer. Repeated resetting without diagnosis can mask a gas supply problem.
Is an EA fault covered by a Worcester Bosch guarantee?
It depends on the boiler's age and service history. Manufacturer guarantee terms vary by model and installation, and may require regular servicing by a Gas Safe engineer. If the boiler is inside its guarantee and servicing is up to date, the repair is generally covered. If it is outside the guarantee, you pay either the manufacturer's fixed-price out-of-guarantee repair or an independent engineer's quote. Check your paperwork before booking anything.
When should I call a Gas Safe registered engineer for an EA fault?
Call one as soon as the EA code appears and a single reset does not clear it. If you can smell gas, hear repeated clicking without ignition, or the boiler keeps locking out intermittently, treat it as urgent and switch the boiler off at the controls. Intermittent EA faults are the hardest to diagnose because the fault may not be present when the engineer arrives, so note down when it happens, what the boiler was doing and any recent work on the system. That information shortens the diagnostic visit and can reduce the final bill.
An EA lockout is rarely a single, simple failure, and the cost depends entirely on which component has given up. Central Heating Scotland provides Gas Safe registered engineers, same-day emergency boiler repair across Glasgow and West Scotland, and clear diagnostic pricing before work begins. Get started with Central Heating Scotland and get your heating back on with a quote you understand.
