Where’s the job?

Overview

• Gas boiler servicing and repairs ensure safe, efficient operation and prolong the lifespan of your unit.

• Skill level: 4 / 5 (requires Gas Safe registration, specialist diagnostic tools and secure handling of gas components).

• Typical duration: 2 – 4 hours for servicing; repairs may take longer depending on complexity.

Safety First

• Always isolate the gas supply and double-check it’s fully shut off before any work begins.

• Use Gas Safe registered engineers and adhere strictly to legal and manufacturer guidelines.

• Ensure the area is well ventilated and that carbon monoxide detectors are in place during and after the repair.

• Wear protective gear including gloves and eye protection to safeguard against any debris or gas exposure.

• After servicing, perform a leak test and combustion check to ensure the system is running safely.

Tools & Materials

Step-by-Step

1. Isolate the gas supply and power down the boiler.

2. Ventilate the area and access the boiler’s internal components.

3. Inspect burners, heat exchanger and flue connections for signs of wear or blockage.

4. Measure gas pressure and check for leaks using appropriate detectors and instruments.

5. Clean components, replace faulty parts and reassemble the boiler carefully.

6. Perform a thorough leak and combustion test to ensure safe operation.

7. Restore gas supply and power up; monitor for error codes or irregular operation.

Completion Checks

• Boiler fires up with a steady, blue flame and reaches the correct operating pressure.

• No trace of gas leakage or abnormal sounds during operation.

• Carbon monoxide readings are within safe limits.

• All error codes have cleared and the boiler’s diagnostic checks pass.

When to Call a Pro Instead

For complex repairs, gas component replacements or if the boiler is covered by a warranty, it is essential to call a Gas Safe registered engineer to ensure compliance and safety.