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Gas Appliance Service Checklist

A Gas Safe engineer's checklist for servicing a domestic gas appliance: soundness test, operating pressure, flue and ventilation checks, combustion analysis. Free PDF download.

What is it?

A gas appliance service checklist is a working document used by a Gas Safe registered engineer when servicing a domestic gas appliance. It lists each check and task in sequence: visual inspection, gas soundness, operating pressure, component cleaning, flue and ventilation checks, combustion analysis and safety device operation: with space to record readings and results. It is both a prompt that ensures a thorough service and a record that documents the condition of the appliance, the work carried out and the readings taken on the day.

About this template

Servicing a domestic gas appliance (a boiler, fire, cooker or water heater) is a structured job, and a service checklist makes sure every step is carried out in the right order and nothing is missed. It guides the engineer through the gas tightness test, operating pressure and heat input checks, cleaning the burner and heat exchanger, flue and ventilation checks, the flue flow and spillage test, combustion analysis and the operation of the safety devices. Only a Gas Safe registered engineer may carry out gas work. A completed checklist provides a clear service record for the customer, supports the manufacturer's warranty and gives the engineer evidence that the appliance was left in a safe, correctly performing condition.

When to use

  • At the annual service of a domestic gas boiler, fire, cooker or water heater
  • When servicing is required to keep a manufacturer's warranty valid on a newer appliance
  • When a landlord wants an appliance serviced as well as safety-checked, often alongside the annual gas safety check
  • After installing a new appliance, to record the commissioning checks and benchmark readings
  • When investigating poor performance, such as a boiler losing efficiency or an appliance with combustion concerns
  • When taking over the maintenance of an appliance and a baseline service record is needed

Tips

  1. 1Always carry out a gas tightness test as part of the service and record the result. It confirms the installation is sound before and after the work
  2. 2Check operating pressure and gas rate against the appliance data plate, not from memory; manufacturers specify different figures and the readings should always be written down
  3. 3Carry out the flue flow and spillage test where the appliance type requires it. A flue that does not clear products of combustion safely is a serious finding regardless of how clean the appliance looks
  4. 4Use a calibrated flue gas analyser for combustion analysis and compare the readings to the manufacturer's acceptable range; keep the analyser calibration certificate current
  5. 5Record serial numbers and all readings on the checklist and leave a copy with the customer: a complete service history supports the warranty and helps the next engineer

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Frequently asked questions

Who can service a gas appliance?

Only a Gas Safe registered engineer may service a domestic gas appliance, and the engineer must be registered for the specific type of appliance being worked on, which is shown on their Gas Safe ID card. It is a criminal offence for anyone who is not Gas Safe registered to carry out gas work. Customers and landlords should always check the engineer's ID card before any gas service or repair begins.

What is the difference between a gas service and a gas safety check?

A gas safety check confirms an appliance is safe to use and produces the gas safety record (CP12). It is what landlords must arrange every year. A service is more thorough: it includes cleaning components, checking operating pressure and combustion performance, and maintaining the appliance so it runs efficiently and reliably. A service usually includes the safety checks, but a safety check on its own does not include the full servicing work.

What is combustion analysis and why is it part of a service?

Combustion analysis uses a calibrated flue gas analyser to measure the gases an appliance produces while running, including carbon monoxide and carbon dioxide and the ratio between them. The readings show whether the appliance is burning gas safely and efficiently. The engineer compares them with the manufacturer's acceptable range. Readings outside that range indicate a combustion problem that must be investigated and corrected before the appliance is left in use.

How often should a gas appliance be serviced?

A gas appliance should be serviced once a year. Annual servicing keeps the appliance running safely and efficiently, is usually a condition of the manufacturer's warranty on newer appliances, and gives the best chance of catching faults early. For landlords, servicing is often arranged at the same time as the annual gas safety check, although the two are not the same thing.

What is a flue flow and spillage test?

A flue flow test checks that the flue is clear and able to carry the products of combustion to the outside. A spillage test checks that, with the appliance running, those products are actually going up the flue and not spilling back into the room. Together they confirm the flue is performing safely. Where the appliance type requires these tests, an engineer carries them out as part of a service and records the results.

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