How to Reset a Worcester Bosch Boiler
A simple step-by-step for resetting your Worcester Bosch boiler — and how to tell when a reset isn't enough and you need an engineer.
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Upfront cost — no obligation If your Worcester Bosch boiler has locked out and stopped working, a reset will often get it going again. This guide walks through how to reset most Worcester Bosch models safely — and, just as importantly, explains when repeated lock-outs mean you should stop resetting and call a Gas Safe registered engineer.
How to reset your Worcester Bosch boiler
Most Worcester Bosch boilers, including the Greenstar range, have a reset button or a reset position on the control dial. To reset: locate the reset button (often marked with a flame symbol or “reset”), press and hold it for around three to five seconds, then release. The boiler should attempt to fire up. Check your boiler’s manual if you’re unsure which control is the reset — different models vary slightly.
Most Worcester Bosch boilers, including the Greenstar range, have a reset button or a reset position on the control dial.
Check the pressure too
If your boiler won’t reset, check the pressure gauge. Worcester Bosch boilers typically need around 1 to 1.5 bar when cold. If pressure is low, repressurising via the filling loop (following the manual) may be needed before the boiler will run. If the gauge reads zero or keeps dropping, there may be a leak — that needs an engineer.
If your boiler won’t reset, check the pressure gauge.
When a reset isn't enough
A one-off lock-out that clears with a reset and doesn’t return is usually nothing to worry about. But if your boiler locks out repeatedly, or won’t reset at all, stop resetting and call an engineer. Repeated lock-outs are the boiler telling you there’s an underlying fault — in ignition, the flue, a sensor or elsewhere — that won’t fix itself and could worsen.
A one-off lock-out that clears with a reset and doesn’t return is usually nothing to worry about.
We repair Worcester Bosch boilers across East London
If your Worcester Bosch keeps locking out, Gas First can help across East London and Essex. We diagnose the real cause rather than just resetting the symptom, so your heating stays reliable. Call us with your model and what the boiler is doing.
If your Worcester Bosch keeps locking out, Gas First can help across East London and Essex.
Frequently Asked Questions
How do I reset my Worcester Bosch boiler?
Find the reset button (often a flame symbol) or reset position on the dial, hold it for three to five seconds, and release. The boiler should attempt to fire up.
How many times can I reset my boiler?
If a reset doesn't hold and the boiler locks out again, don't keep resetting — repeated lock-outs indicate a fault that needs a Gas Safe engineer.
What pressure should my Worcester Bosch be at?
Typically around 1 to 1.5 bar when the system is cold. Low pressure may need repressurising; a gauge that keeps dropping suggests a leak.
Why won't my Worcester Bosch boiler reset?
If it won't reset, there may be low pressure or an underlying fault. Check the pressure first; if that's fine and it still won't run, it needs an engineer.
Is it safe to keep resetting my boiler?
A single reset is fine. Repeatedly resetting a boiler that keeps faulting is not a fix and can mask a worsening problem.
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