Glow-worm F22 Fault Code Guide for Homeowners: Meaning, Symptoms, Actions, Costs, Causes & Prevention

Meaning of the Glow-worm F22 Fault

The Glow-worm F22 fault code signals a low water pressure issue in your boiler. Your boiler needs a certain amount of water pressure to function correctly. When water pressure drops too low, the boiler’s display shows the F22 fault code. This safety feature prevents boiler damage. It ensures the boiler does not operate unsafely. Understanding the F22 fault code is crucial for maintaining your boiler’s efficiency and longevity.

What causes the F22 fault code to appear?

The F22 fault code appears when the water pressure in your boiler drops below the optimal level. This can happen due to leaks in the system, recent bleeding of radiators, or insufficient water supply. Monitoring your boiler’s pressure gauge regularly helps you catch and address this issue promptly.

How does the boiler detect low water pressure?

Your boiler has a pressure sensor that constantly monitors the water pressure within the system. If the pressure drops below the set threshold, the sensor triggers the F22 fault code. This mechanism protects the boiler from running with too little water. That could cause overheating or other damage.

Why is maintaining proper water pressure important?

Maintaining proper water pressure ensures that your boiler operates efficiently and safely. Low water pressure can lead to inadequate heating, potential damage to the boiler, and inefficient energy use. Check and keep the right water pressure often. It makes your boiler last longer and keeps your heating system running well.

Can you reset the F22 fault code yourself?

You can reset the F22 fault code by repressurizing your boiler. Find the filling loop under the boiler. Follow the manufacturer’s instructions to raise the water pressure to the recommended level. If you are unsure or uncomfortable doing this, contact a Gas-Safe engineer.

When should you call a Gas-Safe engineer?

If the F22 fault code persists after you have topped up the water pressure, or if you notice leaks or other issues, contact a Gas-Safe engineer. Professional help ensures that any hidden problems are found and fixed. This keeps your boiler safe and efficient.

Next, we will describe the symptoms of the F22 fault in more detail.

Symptoms of the Glow-worm F22 Fault

The Glow-worm F22 fault code manifests in several noticeable ways. The most common symptom is the boiler shutting down or failing to operate. You may also see the F22 error code displayed on the boiler’s screen. Also, you might notice a big drop in heating or a lack of hot water. These symptoms show that the water pressure is too low and the boiler can’t work properly.

How To Recognise The F22 Fault on Different Types of Glow-worm Boiler

Glow-worm Combi Boilers

Glow-worm Combi boilers show the F22 fault code on their digital display panel. You might also hear strange noises from the boiler. They might be gurgling or banging. These sounds indicate low water pressure. The heating and hot water supply will be inconsistent or entirely absent.

Glow-worm System Boilers

Glow-worm System boilers also show the F22 fault code on the digital screen if it’s present. You may also notice the radiators not fully heating up. The boiler may also cycle on and off a lot. These signs suggest that the system’s water pressure is below the necessary level.

Older Non-Digital Glow-worm Boilers

In older non-digital Glow-worm boilers, recognising the F22 fault can be more challenging. Look for signs such as the boiler not igniting, radiators staying cold, or a lack of hot water. You may also need to check the pressure gauge manually to confirm low water pressure. These boilers lack digital error code displays.

Next, we will suggest actions to take in the event of the F22 fault.

Cost to Repair F22 Fault on Glow-worm Boilers

The cost to repair the F22 fault on Glow-worm boilers varies depending on the specific issue. You should expect to pay between £50 and £150 for minor repairs. These include topping up the water pressure or replacing a pressure sensor. Typical costs for most homeowners range from £75 to £125, covering labour and basic parts. However, if much work is needed, like fixing leaks or replacing major parts, costs can go up to £300. It’s crucial to get a quote from a Gas-Safe engineer. This will help you understand the exact repair costs for your situation.

What to Do When Your Glow-Worm Boiler Shows the F22 Fault

When your Glow-Worm boiler shows the F22 fault, the first step is to check the water pressure. Locate the pressure gauge on your boiler, which should read between 1 and 1.5 bar. If the pressure is low, you need to top it up using the filling loop. Follow the instructions in your boiler’s manual to safely increase the pressure.

Frequently Asked Questions

How to Top Up the Water Pressure in My Boiler?

To top up the water pressure, locate the filling loop on your boiler. It usually consists of a small hose with two valves. Open both valves to allow water into the system until the pressure gauge reads between 1 and 1.5 bar. Then, close the valves securely.

Should I Turn Off the Boiler If I See the F22 Fault Code?

Yes, if you see the F22 fault code, it’s best to turn off your boiler to prevent any potential damage. After turning it off, check the water pressure and follow the steps to top it up.

Where Can I Find the Filling Loop on My Boiler?

The filling loop is typically located beneath the boiler. It’s a flexible hose that connects the mains water supply to the boiler system. Refer to your boiler’s manual for the exact location and instructions.

Should I Shut Off the Gas Supply If I Notice the F22 Fault?

You do not need to shut off the gas supply for the F22 fault, as it relates to water pressure, not a gas issue. However, if you smell gas or suspect a leak, promptly shut off the gas supply. Then, contact a Gas-Safe engineer.

How to Check for Gas or Water Leaks?

To check for gas leaks, smell for gas near your boiler. For water leaks, inspect the area around your boiler for any signs of water. If you detect any leaks, turn off the boiler and contact a Gas-Safe engineer immediately.

Next, we will describe the major causes of the F22 fault in more detail.

The 4 Major Causes of The F22 Fault

The F22 fault code on your Glow-Worm boiler indicates low water pressure. This issue can come from several main causes. These are: leaks, recently bled radiators, low water supply, or a bad pressure sensor. Understanding these causes helps you address and prevent the fault effectively.

1. Leaks in the System

Leaks in the boiler system are a common cause of the F22 fault. Water escaping from pipes, radiators, or the boiler itself reduces the overall pressure. Inspect your system regularly for visible leaks. Look for damp patches on walls, ceilings, or near radiators. Fixing leaks promptly prevents pressure drops and further damage.

2. Recently Bled Radiators

Bleeding radiators removes trapped air but can also reduce water pressure. After bleeding your radiators, check the boiler’s pressure gauge. If the pressure is low, use the filling loop to top it up. Regularly monitor and maintain the correct pressure to ensure efficient boiler operation.

3. Insufficient Water Supply

An insufficient water supply to the boiler can cause the F22 fault. This may happen if the mains water supply is disrupted or the filling loop is not fully opened. Check that the filling loop is properly connected and the valves are open. Ensuring a consistent water supply helps maintain proper pressure levels.

4. Faulty Pressure Sensor

A faulty pressure sensor can incorrectly detect low pressure, triggering the F22 fault code. If you suspect a sensor issue, contact a Gas-Safe engineer. They can diagnose the problem and replace the sensor if needed. This will restore accurate pressure readings and reliable boiler performance.

Next, we will discuss actions to take in the event of the F22 fault in more detail.

Preventing Future F22 Faults

Preventing the F22 fault involves regular maintenance and monitoring. Check your boiler’s water pressure monthly. Keep it in the recommended range. Address any leaks or issues promptly to avoid pressure drops. Annual boiler maintenance under a boiler service contract is highly recommended. The service is professional. It includes thorough inspections, cleaning, and adjustments. These keep your boiler efficient and prevent faults.

Disclaimer

Any work beyond the operations in the user manual should be done by a Gas-Safe engineer. This ensures all repairs meet safety standards. It protects you and your home. Always consult a professional for any issues you cannot safely resolve yourself.