Greenstar
Worcester Bosch
Common Greenstar boiler errors, ignition problems and heating faults.
EA
A1
E9
C6
View Worcester Bosch Codes
From boiler faults to heating problems, find straightforward advice and practical next steps.
Not sure what's wrong with your boiler? Explore common faults, symptoms and solutions.
Pressure too high or too low? Understand what the readings may mean.
No hot water from your taps? Find possible causes and what to check first.
Banging, whistling or gurgling? Discover what unusual boiler sounds may indicate.
Boiler not firing up or repeatedly locking out? Explore possible ignition faults.
Seeing an error code? Find explanations for common boiler brands and models.
Straightforward guidance for problems homeowners commonly experience.
Some boiler and plumbing problems require qualified assistance. Never remove your boiler casing or attempt internal gas repairs. If your boiler repeatedly breaks down, leaks or stops working, professional help may be needed.
Seeing an error code on your boiler? Select your manufacturer below to explore common fault codes, possible causes, safe checks and when to call an engineer.
Common Greenstar boiler errors, ignition problems and heating faults.
Explore pressure, ignition and circulation-related fault messages.
Find Ideal boiler fault codes, lockouts and pressure-related errors.
Baxi fault codes covering pressure, flame detection and circulation issues.
Common Glow-worm error messages, lockouts and heating system faults.
Vitodens fault codes involving ignition, overheating and fan issues.
Fault-code meanings vary by boiler model. Always consult the manufacturer's instructions for your appliance.
Our guides draw on practical plumbing and heating experience across London. Gas and boiler work is carried out by appropriately qualified Gas Safe registered engineers.
Answers to common questions about using our plumbing, boiler and heating guides safely.
Speak with the Keystone London team and explain the problem you are experiencing.
Call 02033 699 999Begin with the symptom you have noticed, such as no hot water, low or high boiler pressure, unusual noises, cold radiators or ignition failure. The relevant guide explains common causes and sensible next steps.
You can perform basic user checks described in the relevant guide, such as checking boiler pressure, thermostat settings or whether the property has power. Never remove the boiler casing or attempt to repair gas or internal components yourself.
Yes. Low pressure, ignition problems, system lockouts, controls and internal component faults can affect both heating and hot water. Check whether the boiler is displaying a fault or error code.
Switch the heating off if it is safe to do so, protect the surrounding area from water and arrange an inspection. Do not remove the boiler casing. Read our boiler leaking guide for further information.
If it is safe, isolate the affected water supply and move belongings away from the leak. For uncontrolled water, burst pipes or overflowing fixtures, contact an emergency plumber as soon as possible.
Call a Gas Safe engineer when a boiler repeatedly locks out, will not ignite, leaks, displays a persistent fault code or requires access to internal components. Suspected gas or combustion problems require urgent professional attention.
Keystone London serves homes and businesses across West, South West and Central London, including Chelsea, Fulham, Kensington, Hammersmith, Putney, Battersea, Wandsworth, Westminster and surrounding areas.
