How to Fix Glow-worm Flexicom 30cx Fault Codes

What is the Glow-worm Flexicom 30cx Boiler?

The Flexicom CX range of boilers is built to work seamlessly within a sealed central heating system with fully pumped circulation. For convenience and efficiency, the boiler comes equipped with an integrated pump, expansion vessel, and essential safety devices, all neatly housed inside the unit. The domestic hot water is delivered directly to the tap without the need for storage.

After you've set the controls, your boiler will run automatically, keeping your home comfortable without further input. For added convenience, you can upgrade to smart controls available from Glow-worm. To learn more or get advice, simply speak to your installer or reach out to the Glow-worm sales team.

This boiler is a room-sealed type equipped with a flue system for supplying air and removing combustion products. This flue system allows for the installation of the boiler in any room without requiring additional ventilation.

The Flexicom cx is compatible with most makes of 230V programmable room thermostats. For increased system compatibility and enhanced energy savings with smart control, Glow-worm offers a range of controls dedicated to domestic heating, using a unique communications system - eBus (low voltage).

Boiler repair, installation and boiler commissioning should only be carried out by a competent heating engineer. They are responsible for the installation and commissioning according to the heating standards.

Common Glow-worm Flexicom 30cx Fault Codes

Understanding fault codes is essential for diagnosing issues with your boiler.

Here are the most frequently encountered codes:

F1 Fault Code: Ignition or Gas Supply Problems

The F1 fault code indicates an ignition or gas supply fault. This could point to several issues:

• Gas valve malfunction
• Ignition electrode problems
• Gas supply interruption
• Blocked gas line
• Faulty ignition leads

F2 Fault Code: Flame Detection Issues

The F2 fault code means the boiler has detected a flame fault. This occurs when:

• The flame fails to ignite properly
• The flame is unstable during operation
• The flame detection electrode is dirty or faulty
• There's insufficient gas pressure

F3 Fault Code: Fan or Air Pressure Switch Problems

The F3 code suggests issues with the fan or air pressure switch:

• Fan motor failure
• Blocked flue or air intake
• Faulty air pressure switch
• Wiring problems with the fan

F5 Fault Code: Overheat Protection

The F5 fault indicates the boiler's heat exchanger has exceeded safe operating temperature:

• Blocked heat exchanger
• Faulty boiler pump
• Insufficient water circulation
• Thermostat malfunction

F22 Fault Code: Low Water Pressure

The Glow-worm F22 fault code is one of the most common issues, appearing when system pressure drops below required levels:

• Water leaks in the system
• Faulty pressure relief valve
• Expansion vessel problems
• Recent radiator bleeding

F11 Fault Code: Communication Problems

The F11 fault signifies communication issues between the main PCB and other components:

• Faulty wiring connections
• Damaged control board
• Sensor communication errors
• Power supply problems

F71 Fault Code: Temperature Sensor Faults

The F71 code points to problems with flow or return temperature sensors:

• Faulty temperature sensors
• Wiring issues
• Sensor positioning problems
• Water flow restrictions

Check out our blog, ‘Ideal Thermostat Temperature for Optimal Home Comfort,’ and discover how to set your thermostat for the perfect balance of warmth and energy efficiency.

What Causes Glow-worm Flexicom 30cx Fault Codes?

Several factors can trigger fault codes in your Flexicom 30cx boiler:

System Pressure Issues

Low pressure is often caused by:

• Small leaks in radiators or pipework
• Faulty pressure relief valve
• Expansion vessel problems
• Air in the system

Frozen Condensate Pipe

During cold weather, the frozen condensate pipe can cause the boiler to lock out. This pipe carries acidic water away from the boiler and is usually located outside.

Poor Maintenance

Lack of regular servicing can lead to:

• Dirty heat exchangers
• Blocked flue systems
• Worn components
• Sensor failures

Power Supply Problems

Electrical issues can cause:

• Communication faults
• Ignition problems
• Control system failures

Gas Supply Issues

Problems with gas supply include:

• Low gas pressure
• Contaminated gas
• Faulty gas valve
• Blocked gas lines

Troubleshooting Glow-worm Flexicom 30cx Fault Codes

Step 1: Check the Pressure Gauge

The pressure gauge should read between 1.0 and 1.5 bar when the system is cold. If the glow worm 30cxi pressure is too low:

1. Locate the filling loop (usually silver braided hose)
2. Slowly open both valves
3. Watch the pressure gauge rise
4. Close valves when pressure reaches 1.2 bar
5. Reset the boiler

Step 2: Inspect the Condensate Pipe

If your boiler won't start in cold weather:

1. Check the condensate pipe outside
2. Look for ice blockages
3. Carefully pour warm (not boiling) water over frozen sections
4. Ensure the pipe slopes downward
5. Consider insulating the pipe

Step 3: Reset the Boiler

Sometimes a simple reset resolves temporary faults:

1. Turn the boiler off using the power switch
2. Wait 10 seconds
3. Turn the boiler back on
4. Check if the fault code clears
5. Monitor the boiler's operation

Step 4: Check External Factors

Examine these common culprits:

1. Ensure the gas supply is connected
2. Check the electrical supply
3. Verify the thermostat settings
4. Inspect the flue terminal for blockages
5. Look for visible water leaks

Step 5: When to Call a Professional

Contact a Gas Safe registered engineer if:

1. The fault persists after basic troubleshooting
2. You smell gas leak
3. The boiler makes unusual noises
4. Multiple fault codes appear
5. You're uncomfortable performing checks

How to Care for Your Boiler?

Proper maintenance prevents many fault codes from occurring:

Annual Service

Book yearly servicing with a qualified engineer to:

• Clean the heat exchanger
• Check gas pressures
• Test safety devices
• Inspect electrical connections
• Verify flue integrity

Monthly Checks

Perform these regular checks:

• Monitor system pressure
• Test hot water and heating
• Check for leaks
• Ensure adequate ventilation
• Clean the exterior

Seasonal Preparation

Before winter:

• Insulate exposed pipes
• Check condensate drainage
• Test the heating system
• Bleed radiators if needed
• Clear external flue terminals

Water Quality

Poor water quality can damage your boiler:

• Consider a magnetic filter
• Use inhibitor chemicals
• Flush the system regularly
• Check for corrosion signs

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When your Glow-worm Flexicom 30cx displays fault codes, professional expertise makes all the difference.

Our Services Include:

• Emergency callouts for urgent heating failures
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• System maintenance to prevent future faults
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Why Choose Serviceteam?

• Gas Safe registered engineers
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Service Areas

We cover all London boroughs, providing prompt professional service when you need it most. Our engineers carry a range of common spare parts for Glow-worm boilers, ensuring faster repairs.

Booking Your Service

Contact Serviceteam for:

• Boiler error code diagnosis
• Emergency repairs
• Annual servicing
• System upgrades
• Maintenance contracts

Keep Your Heating System Running Smoothly

Understanding Glow-worm Flexicom 30cx fault codes empowers you to take appropriate action when problems arise. While basic troubleshooting can resolve simple issues, such as low pressure, many faults require professional diagnosis and repair.

Regular maintenance remains the best prevention against boiler error codes. Annual servicing, monthly pressure checks, and seasonal preparation keep your boiler operating efficiently and safely.

For professional boiler repair services in London, Serviceteam offers the expertise and rapid response you need to restore your heating system quickly and safely.

Frequently Asked Questions - FAQs

What is the F1 fault on the Glow Worm Flexicom 30cx?

The F1 error indicates that your boiler has attempted to ignite five times but failed, and has entered 'lockout' mode for safety. To fix the issue, first try resetting the boiler and turning the heating back on. If that doesn't work, check if the condensate pipe, especially where it connects to the drain, is frozen or blocked, as this can prevent the boiler from operating properly.

How to reset a fault on a Glow-worm boiler?

If your Glow-worm boiler displays a minor fault, such as low pressure or a thermostat issue, a quick reset may resolve the issue. Locate the red reset button on the front or side of the boiler and hold it down for 3–10 seconds (refer to your model's guide for the exact time).

What is the F22 fault on Glow-worm Flexicom?

The Glow-worm F22 fault code indicates low water pressure in your heating system, typically caused by a leak in the central heating pipes. It's the boiler's way of alerting you that the system needs attention.

What is the F3 fault on Glow Worm Flexicom?

Displaying an F3 fault code indicates that the boiler fan isn't reaching the correct speed required for ignition. This prevents the boiler from firing up safely until the issue is fixed.