Boiler Showing Error Code F28 or EA? Here's What It Means in Manchester
Quick Answer
What does error code F28 or EA mean on my boiler?
F28 (Vaillant) and EA (Worcester Bosch) both indicate an ignition fault — the boiler attempted to fire but failed to detect a flame. This is usually caused by a gas supply issue, a faulty ignition electrode, or a failed gas valve.
Boiler error codes exist to tell you (and your engineer) exactly what has gone wrong. F28 is one of the most common codes displayed by Vaillant boilers; EA serves the same purpose on Worcester Bosch. Both mean the same thing: the boiler tried to ignite and failed — either because no flame was established, or because the flame sensor couldn't detect it.
Is the Gas Supply OK?
Before assuming a component fault, check the obvious. Is your gas supply working? Test other gas appliances — cooker hob, gas fire — to see if they ignite normally. If nothing gas-powered is working, the problem is with your gas supply, not your boiler. Call Cadent Gas on 0800 111 999.
Also check your gas meter hasn't gone into emergency credit mode. If you're on a prepayment meter and it's run out, that explains the fault immediately.
Ignition Electrode and Lead
The ignition electrode creates the spark that lights the gas. Over time, electrodes wear and accumulate carbon deposits, becoming less effective at producing a reliable spark. A faulty or worn ignition electrode is one of the most common causes of F28/EA faults.
The ignition lead (which carries the electrical signal to the electrode) can also become damaged or corroded. Both are relatively inexpensive parts, and replacement by a Gas Safe engineer typically costs £100–£180 including parts and labour.
Gas Valve Issues
The gas valve controls the flow of gas to the burner. A stuck or failing gas valve can prevent gas from reaching the burner even when the ignition system is working correctly — hence the F28/EA fault. Gas valve replacement is a more significant repair, typically costing £200–£400.
On older boilers where the gas valve cost approaches the value of the boiler itself, replacement may be more economical than repair. Our engineers will give you an honest assessment.
Warning: If you can smell gas, do not attempt to reset the boiler. Evacuate the property and call the National Gas Emergency Service on 0800 111 999 immediately.
Frequently Asked Questions
Can I fix an F28 fault myself?
You can check the gas supply and try a reset. All internal component work — electrodes, gas valves — must be carried out by a Gas Safe registered engineer.
How much does it cost to fix an F28 fault?
Ignition electrode replacement costs £100–£180. Gas valve replacement costs £200–£400. Our engineer will diagnose the exact cause and quote before proceeding.
Why does my boiler keep showing F28 / EA?
Recurring ignition faults that keep returning after reset usually indicate a failing component — most commonly the electrode, lead or gas valve — that needs replacement.
Is F28 the same on all boilers?
No. Error codes differ between brands. F28 is specific to Vaillant; Worcester Bosch uses EA; Baxi uses E133. The meaning (ignition fault) is similar but the exact diagnostic approach differs by model.
How quickly can you come out for an F28 fault in Manchester?
We offer same-day and next-day appointments across Manchester, Salford and Greater Manchester. Call 07305 687 331 or WhatsApp us to check current availability.
Need emergency boiler help in Manchester or Salford? Call: 07305 687 331