How To Reset A Keston Boiler

If your Keston boiler suddenly turns itself off, don’t panic.

Modern boilers usually power down as a safety feature if an issue occurs within the system.

It does this to protect the unit from further damage.

This modern safety feature is generally referred to as entering lockout mode and will often require the homeowner to address the issue and reset the boiler.

There are many reasons why a boiler will enter lockout mode, which include:

• Low system pressure
• Ignition faults or no gas supply
• Overheating
• Electrical supply problems

Before you hit reset, always check the boiler’s display screen.

Keston boilers will display error codes that guide you to the issue.

So, what are the most common error codes you’ll see when your Keston boiler activates lockout mode?

Understanding Keston Boiler Error Codes

Keston boilers, like all brands, use error codes to help you identify the fault.

As mentioned, these appear on the display panel and point you towards the likely cause.

While the exact codes vary by model, here are some you may come across:

The following table:

The exact fault codes can vary depending on your boiler’s age and model.

For the most accurate guidance, always refer to your boiler’s user manual.

If you no longer have a copy, most manuals are available to download directly from the manufacturer’s website.

Now that we’re up to speed with what the most common error codes mean, let’s get to the primary reset methods.

Reset Methods for Keston Boilers

Keston is a well-established British boiler brand, known for its balance of efficiency and practicality.

Backed by decades of engineering expertise, Keston boilers have earned a reputation for ease of operation and maintenance.

Also, they are known for their easy-to-understand user interface, and this extends to how you reset them.

The exact reset method depends on the model you have at home, but don’t worry, it is usually simple.

Here are the most common ways to get your boiler back up and running:

1. The Reset Button

Most Keston models keep things friendly and straightforward with a reset button right on the control panel.

If your boiler has one, press and hold it for about 3 to 5 seconds.

You’ll usually hear a click or notice the display change as the boiler begins its restart sequence.

2. The Selector Dial

Other Keston boilers might have their reset function built into the main control dial rather than using a separate button.

To reset, simply turn the dial to the reset symbol or setting, hold it there for a few seconds, and then release.

Within moments, the boiler should kick back into life.

3. Digital Display Models

If you’ve got one of the newer Keston boilers with a digital screen, resetting feels more like navigating a modern gadget.

Using the arrow keys or menu buttons, scroll through the options until you see “Reset.”

Select it, confirm your choice, and let the system do its thing.

You may see a progress bar or a short message while the restart happens, and within a minute or two, your heating and hot water should be back in action.

Select the reset function to confirm.

The screen will usually show a progress bar or message while the boiler restarts.

Within a minute or two, it should be back in action, ready to resupply heating and hot water.

Now that we know the usual methods of resetting a Keston boiler, let’s go through the steps.

How to Reset Your Keston Heating Boiler

It’s tempting to go straight for the reset button when your boiler flashes up a fault code, but taking a moment to check the basics can save you a lot of frustration.

Here are the main things to look at before hitting reset:

1. Check Your Gas Supply

If your Keston boiler shows an ignition fault (e.g., error code E01), it could simply mean that no gas is reaching the unit.

A quick way to test this is by turning on another gas appliance in your home, such as the hob.

If the hob doesn’t light either, then the problem lies with the supply, not the boiler.

In that case, you’ll need to contact your gas provider rather than keep resetting the system.

2. Look at the Water Pressure

Keston boilers are designed to work best when the system pressure sits between 1.0 and 1.5 bar when the heating is off and the water is cold.

You can check this by glancing at the pressure gauge on the front of the unit.

If it’s too low, use the filling loop to top it up until the needle is back in the correct range.

If it’s too high, the simple fix is to bleed a radiator, which releases a little water from the system and lowers the pressure.

3. Confirm the Power Supply

Sometimes, the culprit is as simple as a lack of electricity.

Keston boilers are usually connected to a fused spur. A fuse spur is usually a small switch box near the unit with a built-in fuse.

Make sure it’s switched on. If it is, and the boiler is still dead, head to your fuse box to check for a tripped breaker.

Flicking the switch back can often solve the problem instantly.

When you’ve finished these checks, go through the reset process mentioned above for your Keston boiler.

However, if the issue continues, it might be time to call in a professional.

When to Call a Professional

If your boiler continues to lock out after resetting, or the same error keeps reappearing, don’t force multiple resets.

That can cause further damage.

Instead, call a Gas Safe registered engineer and provide them with the error code you noted down.

This will help them diagnose and fix the problem quickly.

At WarmZilla, we can connect you with trusted engineers across the UK who specialise in Keston boilers, often helping within 48 hours.