A How To Guide On How To Repressurise An Ideal Boiler

Ideal’s modern boilers automatically shut down when they detect the water pressure is too low and show the error code F1. This isn’t a quality statement, as their Trustpilot score after 50,000 reviews was 4.8 stars out of 5.

If you are wondering whether repressurising a boiler is normal, it is. You might be surprised to learn that it is a simple DIY task that most homeowners can handle. If you have an annual boiler service done by a Gas Safe registered engineer, you might not need to top up your boiler’s water level.

In most circumstances, your boiler can be repressurised once you are served with the error code. However, if you have to top up your Ideal boiler’s water pressure frequently, it could indicate an issue.

There are multiple reasons why your Ideal boiler, or any for that matter, might be losing pressure.

Reasons Why Your Ideal Boiler Is Losing Pressure Regularly

All boilers (no matter the brand) will lose pressure over time from general use. Frankly, the amount of water lost when regularly used is incredibly minimal.

However, as mentioned, when the water level drops too low, your Ideal boiler will display its F1 error code and automatically shut off to prevent damage to itself and the more extensive heating system.

But if you get the error code regularly or multiple times a year, it could be due to several common boiler issues. These common pressure problems include:

A Leak In The System

For your boiler to work efficiently, it must be able to maintain its system’s pressure. Even a tiny leak in your heating system’s pipes, radiators, and inside the boiler itself can cause the pressure to drop.

For a pressure drop from 1.5 to 0.5 bars, a generalisation of a rough amount of water lost is around 3 litres.

If you lose 3 litres of water over a week, it is 17ml per hour, which you’d notice from the boiler cutting out a week later. But even this tiny leak can significantly affect your boiler’s pressure.

Locating a leak/s can be difficult, as they are sometimes not visible. Leaks can be located anywhere along the system’s pipelines, such as inside a wall, under the floor, or in the ceiling.

Telltale signs that your boiler’s heating system has a leak/s include:

• Visible water or damp spots
• Inconsistent heating or hot water
• Strange noises (gurgling or hissing)
• Unexplained increase in water usage
• And unusual smells (dampness or wet metal smell)

To locate and fix any leak in your boiler’s system, you must contact a Gas Safe registered engineer to do the work.

Broken Pressure Relief Valve

The pressure relief valve is arguably your boiler’s most crucial safety device. Its main function is to release pressure when it reaches a critical level.

When your boiler’s system does reach a critical level, the safety device automatically opens and releases the built-up pressure. If it is not working correctly, it could leak water or realise steam too soon.

In the worst-case scenario (and very unlikely), the valve could fail to release built-up pressure, posing a significant risk.

Not Enough Inhibitors

Like a car’s radiator, your boiler’s system needs a mixture of water and inhibitors (or coolant in a car) to ensure it works.

Regarding your boiler’s system, the inhibitors ensure they slow down the chemical reaction between the water and metal of radiators, which are generally made from steel.

Also, inhibitors will help present gas build-ups, as the chemical reaction between water and steel releases gases, forming bubbles that can cause blockages or replace water in the system.

Bleeding your radiators is a simple task to release this gas build-up. However, when topping up the pressure, most DIYers use water from the mains without inhibitors. By diluting these inhibitors, you will increase the regularity of when you need to bleed your radiators, creating a cycle that results in a system without chemical assistance.

Contact a Gas Safe registered engineer if you want to correct your system’s inhibitor levels.

This leads us to the next common culprit for needing to repressurise an Ideal boiler.

Bleeding Radiators

Bleeding your home’s radiator, as mentioned, is a simple task.

The purpose of bleeding your radiators is to release air pockets from the heating system, allowing for an even flow of heat through the boiler’s heating system.

If there are cold spots on the top of your radiators, you will know they need to be bled.

But no one is perfect, and we can all make mistakes occasionally. For example, the system’s pressure can drop if an eager DIYer releases too much water after the air bubble.

When bleeding your radiator, you usually want to gradually release the trapped air bubbles. However, if you accidentally open it too far, you’ll allow too much water out of the system, reducing its pressure.

You must repressurise your system to correct this, but at least now you know the issue is human error. Also, you don’t need to call a Gas Safe registered engineer to correct this problem.

Boiler Pump Issues

Your boiler needs a pump to circulate water around its entire heating system. The pump is also critical to maintaining the system’s pressure. Making sure it is set correctly can save you a lot of time.

If the pump is set at a high speed, it can cause air bubbles in the water, resulting in air pocket issues (which we’ll elaborate on later).

During an annual service, your Gas Safe registered engineer will adjust the boiler’s pump. However, if the pump is broken, it will struggle to maintain the heating system’s pressure.

If your boiler’s pump is extremely hot, has water leaking out, or the water flowing through it is cold, these are all clear signs it is broken.

You will need a Gas Safe registered engineer to replace the pump if it is broken.

Expansion Vessel Isn’t Working

A boiler’s system is an enclosed and pressurised system that circulates warm water, which means it needs to withstand the expansion and contraction of some components.

These expansions and contractions also produce minor pressure changes that a boiler’s expansion vessel handles. A boiler’s expansion vessel is a small tank with a rubber diaphragm that balloons and deflates.

The diaphragm works with an air cushion to create regulated internal water pressure. When the system heats up, the water volume builds and expands. This hotter water pushes the diaphragm towards the air cushions, while the opposite happens when the temperature decreases.

Your expansion vessel’s diaphragm and air cushions work together to regulate the heating system’s pressure and help prevent sudden spikes that can damage it.

If this expansion vessel malfunctions, becomes damaged or loses its air charge, it cannot maintain the pressure balance in your system. A broken expansion vessel will result in a pressure drop.

You must contact a Gas Safe registered engineer to repair your system’s expansion vessel.

Chilly Weather

When temperatures drop below freezing for an extended period, your boiler’s external condensate pipes can freeze.

If your Ideal boiler has a frozen condensate pipe, it might display an error code of L2 or, if there is a solid blockage, F2.

But you can diagnose if your boiler has a frozen condensate pipe from the following signs:

• An odd gurgling noise
• Dripping water under the boiler
• Boiler switches off
• And no hot water or heating

Now that we’ve gone through all the common culprits, what is the best pressure level for your Ideal boiler?

Best Pressure Level For An Ideal Boiler?

Your boiler must maintain the correct pressure level to perform efficiently.

For most boilers in the UK, including Ideal, the best pressure level is between 1 and 1.5 bars. But always consult your boiler’s manual, as some models may have different requirements.

However, if you can’t locate your manual or cannot Google the answer, your boiler’s gauge will clearly indicate the best pressure. Generally, it is good when the needle on your boiler’s pressure gauge is in the green zone.

If your boiler’s needle is below the good pressure zone, it is too low, while above indicates it is too high.

Now that we’ve discussed the best pressure for an Ideal Boiler let’s go through the step-by-step process of repressuring it.

Step-By-Step To Repressurising Your Ideal Boiler

While repressurising your Ideal Boiler is simple, it is important to follow these instructions closely.

As with any project, it’s essential to prioritise safety.

Step 1: Turn Off The Power

Turning off your boiler’s power is usually simple: You only need to flip a switch. However, this switch is called a fuse spur for your boiler, and it looks like a large, square light switch.

If you can’t find this enlarged light switch, sometimes boilers are wired into regular home sockets.

But if you are uncertain that you’ve turned off the boiler, turn off all the power in your home from the switchboard.

Some manufacturers suggest letting the system cool down for 4 to 6 hours before repressurising.

Step 2: Identify And Find The Filling Loop System

A boiler’s filling loop system connects your unit to the home’s cold water mains. Filling loops are used to top up the water levels in your boiler’s heating system.

Your boiler’s filling loop system is usually located underneath the unit. There are also two types of filling loops: external and internal.

While these systems are different, they do the same thing.

External Filling Loop

An external filling loop is a metal braided hose that connects your main cold water supply to the central heating system. These loops are usually stored near the boiler.

An external filling loop has two valves:

• One controls water flow from the mains.
• The other prevents backflow from the heating system into the mains.

You might need a flat-head screwdriver to open and close these valves. But again, this can vary between needing an additional key, a tool, or, in some cases, none, as the valves have leveller taps.

Once you’ve repressurised your boiler, remove the external filling loop. Leaving it attached increases the risk of contamination.

Older boilers tend to use external filling loops, while modern models use the following type of filling loop.

Internal Filling Loop

An internal filling loop is integrated into the boiler and is common in modern systems. It is more convenient because it remains permanently installed and is easier to operate. Depending on the design, you might need a key to operate the loop or use a lever tap.

Some internal filling loop systems use a component called a rigid filling link, which is also typically stored near the boiler. This link is a bent copper pipe with two brass wing nuts and washers.

When attaching a rigid filling link, ensure the water mains and boiler taps are off. The lever should be positioned at a 90-degree angle to the water flow.

Remove the system’s blanking caps (which protect the threads and outlets from debris).

Position the washers inside the wing nuts and gently tighten the rigid filling link into place. Avoid over-tightening, as this can damage the threads and cause leaks.

Once the filling loop is securely in place, you can move on to the next step in repressurising.

Step 3: Opening The Valves

Start by opening the first valve, allowing cold water from the mains to fill the loop. You should hear the water fill the loop.

Gently open the second valve to the boiler’s heating system. Don’t open the valve all the way, as this will fill up the system too quickly, overpressurising it.

Allow the water to flow into the system gradually while monitoring the boiler’s pressure gauge.

You should see the needle start to rise. When it reaches one bar, turn off the water valve.

Step 4: Closing The Valves

As mentioned, it is time to close the valves when your Ideal boiler’s pressure gauge reads one bar. After you’ve closed the valves, you should wait and see if the reading on the gauge rises a little.

When turning off the filling loop, close the valve feeding into the boiler’s heating system, followed by the valve from cold water from the mains.

When removing an external loop, have a towel or bowl nearby to catch the water in the pipe.

Step 5: Turn It Back On

Always wait a few minutes for the pressure gauge to settle before turning it back on. But once the reading is firmly set at a safe level of 1 to 1.5 bars, it is time to turn your Ideal boiler back on.

After turning the boiler on, monitor the pressure level to ensure it stays within the acceptable range.

If it rises above the acceptable pressure level, drain the excess water from the system by bleeding your radiators.

Step 6: Lowering The Water Pressure

You will want to bleed your radiators to lower the pressure in your boiler system.

As mentioned, this is a simple task. But if you’re not keen to learn another DIY task, you can always call a professional for help.

Call WarmZilla To Help You

While it is noble to learn a new skill, sometimes you don’t have the time to do it slowly and correctly. In this case, it is best to get a professional to do it quickly.

WarmZilla offers emergency boiler repair services within 48 hours anywhere in the UK.

Feel free to talk to one of our many experts. They can advise you on the next best step.