Where Is The Reset Button On My Boiler?

If your home’s boiler has suddenly shut off or is now flashing an error code, firstly, don’t panic.

Most modern boilers will enter a lockout mode to protect themselves from causing more damage.

These modern boilers will enter a “lockout” mode when something such as:

• Low boiler pressure
• Ignition or flame failure
• Power interruption
• Overheating

A reset clears this lockout once the issue is fixed.

As a homeowner, there are a few simple DIY fixes you can tackle on your own.

Issues You Can Fix As A Homeowner

Before you hit that reset button, take a few minutes to run through some simple checks.

These include:

Check Your Gas Supply

If your boiler fault mentions ignition failure or no flame detected, the first step is to confirm that gas is reaching your property.

Try lighting another gas appliance, such as your hob or oven.

If there’s no flame there either, the problem isn’t with your boiler, or it’s a gas supply issue.

Check that:

• Your prepayment meter hasn’t run out of credit.
• The external gas valve outside your home hasn’t been turned off.

If both look fine and other gas appliances are functioning correctly, then the issue likely lies within the boiler itself.

Move on to the next check.

Check The Boiler Pressure

Low boiler pressure is one of the most common reasons a boiler locks out.

Your boiler (and most modern combis) runs best between 1.0 and 1.5 bar when the system is cold.

If the gauge on the front shows below 1.0 bar, your boiler won’t fire because there’s not enough water circulating through the system. You can fix this by repressurising the boiler: use the filling loop (a small silver hose underneath the boiler) to slowly add water until the needle sits in the correct range.

If the pressure is above 2.0 bar, it’s too high. Gently release pressure by bleeding a radiator with a bleed key. This lets out a small amount of air and water, bringing the level back down safely.

Make Sure The Boiler Has Power

It sounds obvious, but it’s easy to overlook.

Most boilers are connected to a fused spur switch, which resembles a single large switch located near the boiler, similar to a light switch.

Make sure it’s turned on. However, if your display is still blank, check your fuse box for any tripped circuits. If a switch has flipped down, that’s likely the cause. Flip it back up to restore power and see if the boiler display comes back on.

Only Reset Once Everything Checks Out

Once you’ve confirmed your gas supply, boiler pressure, and power are all in order, you can safely press the reset button.

Skipping these steps could land you back on the same error screen, or worse, hide a fault that needs professional attention.

However, before we proceed, let’s locate the reset button on your boiler.

Where To Find The Reset Button On Your Boiler

As you’d assume, every boiler will have its own location where the reset button will be located.

Additionally, even between brand models, these reset buttons can be located in different positions.

However, most reset buttons are generally simple to locate and visible on the unit’s front panel.

Worcester Bosch Boilers

Most Worcester Bosch models, such as the Greenstar series, feature a reset button on the front control panel. It’s usually a small button with a flame symbol and a circular arrow. For digital displays, go to the on-screen menu, select “Reset”, and confirm.

Vaillant Boilers

On Vaillant ecoTEC boilers, the reset button is often marked with a flame and cross symbol. Press and hold it for 3 seconds until the fault code clears. If your model has a touchscreen (such as the newer ecoTEC Plus), navigate to Menu > Reset and follow the on-screen instructions.

Ideal Boilers

For most Ideal Logic or Vogue boilers, the reset button is located on the right-hand side of the control panel. Press and hold for between three and five seconds, then release.

Baxi Boilers

Baxi combi boilers often have a simple “R” button. You’ll find it near the display or next to the temperature dials. Hold it down for a few seconds until you hear the boiler start again.

Alpha Boilers

Alpha models typically feature a dedicated reset button located on the front or beneath the flip-down panel. If your model has digital controls, use the menu to select Reset. After pressing, wait for the system to complete its safety checks before heating resumes.

Glow-worm Boilers

often hide the reset button behind the front cover or under the control flap. Look for a button marked with a “Reset” label or circular arrow icon. Hold for a few seconds, and you should hear the pump kick in.

Potterton Boilers

Potterton boilers, such as their Promax or Titanium models, usually have a small reset button marked with “R” or a circular arrow on the front control panel. For older models, you’ll often find it near the temperature control dial or just below the LCD display. Press and hold the button for 5 seconds until the fault code clears or the boiler restarts.

Ariston Boilers

Ariston boilers, such as the Clas ONE and E-Combi EVO, typically feature their reset control built into the digital display menu.

To reset:

• Press the “OK” or “Reset” button (depending on the model).
• Hold it for a few seconds until the error disappears.

Some models, such as the Ariston Genus, may also have a physical reset button located on the bottom right-hand side of the control panel, marked with a curved arrow.

Navien Boilers

Navien’s modern condensing boilers, such as their NCB or NPE series, use a digital reset function instead of a physical button. To reset, press the “Mode” button repeatedly until you reach the “Reset” option, then select it using the “OK” button. If your model displays a fault code (e.g., “E003” or “E109”), the screen will confirm when the reset process begins.

Main Heating Boilers

Main Heating (part of Baxi) keeps things simple. The reset button is usually located on the front panel, clearly labelled “Reset” or shown with a small flame symbol and a cross. Press and hold for 3 to 5 seconds until the red fault light turns off.

ATAG Boilers

Most models, such as the ATAG iC or Economiser Plus, have a physical reset button located on the main control panel, often marked with a circular arrow or the word “Reset.” Press and hold this button for 5 to 10 seconds until the display changes or you hear the boiler start to power up again. Some newer ATAG models may use a digital menu instead. If so, navigate to Menu, scroll to the Reset function, and confirm. Once the boiler completes its safety checks, it should ignite and display its usual temperature screen.

Intergas Boilers

Most Intergas boilers, such as the ECO RF, Rapid, or HRE, feature a reset button on the front panel. Look for a small circular button or one marked with “Reset.” Press and hold the button for around 5 seconds until you see the fault code disappear and the boiler restarts. You may hear the fan begin to spin and the ignition click as the system relights. On newer Intergas Xtreme models with a digital display, use the control dial or buttons to access the reset option via the screen.

Viessmann Boilers

Viessmann boilers, including popular models like the Vitodens 050-W, 100-W, and 200-W, can be reset in one of two ways, depending on the display type. If your boiler has a reset button (usually marked with a flame and a circular arrow), press and hold it for around 5 seconds until the error clears or the display restarts. You’ll often hear the unit power cycle and attempt to ignite. For digital touchscreen models, press the “OK” or “Menu” button, navigate to Reset, and confirm. Wait while the boiler performs its internal safety check. If it reignites, you’re back in business.

Vokera Boilers

For most Vokera boilers, including the Easi-Heat, Compact, Mynute, and Linea ranges, the reset process is very similar. Locate the reset control on the front panel. It’s often a button marked with a small flame and a circular arrow or the letter “R.” Press and hold for about 3 to 5 seconds until the red fault light goes out or the display clears. In some modern Vokera models, you’ll find a selector switch with a Reset position instead of a button. Turn the switch to Reset, hold for a few seconds, then release it back to Heating/Hot Water. The boiler will restart and attempt ignition.

Keston Boilers

On Keston models, such as the C30 or System 2, the reset button is typically located on the right-hand side of the control panel, often behind a small hinged flap. Look for a button with the reset icon (a circular arrow) or the letter “R”. Press and hold for around 5 seconds until the display restarts.

Ferroli Boilers

Most Ferroli boilers, including the Modena, i25, and BlueHelix ranges, have a clear reset button on the front control panel. It’s either labelled “Reset” or marked with a flame and a cross symbol.

To reset:

• Press and hold the button for 2 to 5 seconds.
• Wait while the boiler restarts and performs its internal checks.

Now that we’ve gone over how to reset most UK boilers, when should you not hit the reset button?

When It Isn’t Fine To Reset Your Boiler

A reset is okay when the problem is minor and you’ve already identified the likely cause.

For example, after topping up the low pressure or following a brief power outage.

If it’s the first time you’ve encountered the fault and the boiler sounds normal, try resetting it.

Don’t reset it if:

• The same error keeps appearing,
• You hear banging or whistling noises,
• The boiler overheats or shuts down immediately after starting, or
• You’re unsure what the fault code means.

Resetting repeatedly won’t solve a deeper issue. It’s better to stop and get it checked.

At that point, it’s best to stop, note down the error code, and contact a Gas Safe registered engineer to investigate why the boiler keeps locking out.

Call WarmZilla For An Engineer

If your boiler still refuses to start after a reset or keeps slipping back into lockout, it’s time to bring in a Gas Safe registered engineer.

When you call, have a few details ready, such as:

• The error code,
• Your boiler brand and model,
• And a quick rundown of what you’ve already checked.

That bit of prep helps the engineer identify the problem faster and get your heating back on track.

WarmZilla can put you in touch with trusted local engineers who specialise in your home’s boiler.

In most cases, we can arrange a visit within 48 hours anywhere in the UK, so you’re not left waiting too long for your heating or hot water to return.