F75 Fault Code Glow-worm Boiler

Boilers are machines. Even the most reliable and well-maintained boilers can encounter issues from time to time.

Let's find out what the F75 error code is in the Glow-worm boiler.

🔍 What is the F75 error code?

[PRESSURE SENSOR ISSUE]

The Glow-worm F75 error indicates an issue with the boiler's pressure sensor. It’s a critical component that monitors water pressure in the system. This sensor communicates with the PCB, the boiler’s control centre, to ensure a safe and efficient operation.

When the PCB detects irregular water pressure or a lack of necessary changes, it triggers the error to prevent potential damage. Therefore, this Glow-worm F75 error often points to a faulty sensor, a problem with the pump, or inadequate water pressure in the system.

🛠️ Possible Causes:
Let's see what causes the F75 Glow-worm error code.


[BLOCKED OR FAULTY PRESSURE SENSOR]

The Glow-worm F75 error code typically arises from the blocked or faulty pressure sensor. This sensor monitors water pressure in the boiler, ensuring it stays within safe limits. Over time, limescale, dirt, or debris can clog the sensor, leading to inaccurate readings.

Also, electrical faults may cause the sensor to stop working altogether. If the pressure sensor fails to detect changes, the PCB triggers the F75 fault.


[HEAT PUMP PROBLEMS]

The next cause is heat pump problems. The heat pump circulates water through the heating system, creating the pressure changes necessary for smooth operation. Wear and tear, sludge buildup, airlocks, or incorrect speed settings can cause the pump to malfunction. Symptoms like unusual noises, vibrations, or stuck components signal an underlying pump issue that requires immediate attention to prevent further damage.


[LOW WATER PRESSURE]

Though it’s less common, low water pressure can also contribute to the F75 error. This is often due to leaks, improper water top-ups, or issues with the filling loop. When paired with a malfunctioning pressure sensor, even minor pressure drops can trigger the error.


🔧 How to Troubleshoot:

Let's find out how to fix the F75 error code.

[RESET THE BOILER]
Start by resetting your Glow-worm boiler. Hold the power button for about 5 seconds until a cross-like symbol flashes, indicating the system is restarting. Once it's back on, see if the F75 error code is resolved and monitor the boiler for proper operation.

[CHECK THE WATER PRESSURE]
If the error persists, check the water pressure. Locate the filling loop, open the valves, and let water flow into the system until the pressure gauge reaches a safe range of 1.0 to 1.5 bar. Close the valves afterwards and recheck the boiler to see if the issue is fixed.

[CALL A GAS SAFE ENGINEER]
While these steps are straightforward and might resolve minor issues, they may not tackle more complex problems. If the issue appears more serious, it’s time to call in a professional Gas Safe engineer to ensure your boiler is repaired safely and effectively.



🏢 About Us:

At Serviceteam, our team of skilled Gas Safe engineers handles every make and model of gas and electric boilers. As a professional boiler installer, we meet the manufacturer's high standards and provide exceptional service and peace of mind.


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We hope this video has been helpful. Click on the link below to book a Serviceteam heating engineer. Thanks for watching, and stay warm!

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