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Regular gas heater servicing plays an important role in helping to keep your heating safe, efficient and reliable through the months you rely on it most. Knowing the warning signs that your heater needs professional attention means you can act before a minor issue becomes a costly breakdown or, in rare cases, a safety risk.

This guide covers the common signs a gas heater may need servicing, what a professional gas heater service typically involves, the factors that influence what a service costs, and how often servicing is generally recommended. It is designed to help you make an informed decision about when to call a licensed gasfitter, not to replace their expertise.

All servicing, repairs, and internal assessment of gas appliances must be carried out by a licensed gasfitter.

If you are planning a new home or considering a new gas connection, check the current rules in your state or territory before making any decisions. New connection requirements, fees and restrictions vary, and specific restrictions apply in Victoria, including limits on new residential gas connections.

Australian Gas Networks does not service gas appliances, but we can help you understand the signs to look out for, when to act, and where to find appropriately licensed gasfitters and other support.

Key Summary

• Warning signs: A yellow or orange pilot light flame, persistent gas smell, unusual noises, poor heating performance, or repeated ignition failures are all reasons to stop using the heater and contact a licensed gasfitter.

• What a service covers: A licensed gasfitter will typically inspect the burner, check gas pressure, test the flue, assess safety controls and check for gas leaks.
• Service cost: Costs vary depending on heater type, location and whether any repairs are needed. Obtain quotes from two or three licensed gasfitters before proceeding, and confirm what is included in the price.
• How often: Check your appliance manual for the manufacturer’s recommended service interval. State safety regulators commonly recommend servicing gas heaters at least every two years by a qualified gasfitter, or more often if your manufacturer specifies.
• DIY is not an option: Gas work, including work on gas supply connections, burners, heat exchangers and internal appliance components, must be carried out by an appropriately licensed gasfitter. Homeowners should only perform basic maintenance allowed by the manufacturer, such as cleaning or replacing accessible filters.

Signs your gas heater needs servicing

Several visible, audible, and performance-based warning signs can indicate a gas heater needs professional attention. Recognising these early can help you avoid more expensive repairs down the track or prevent a fault from going undetected. None of the signs below require you to inspect the heater yourself. Your role is to observe what is happening and communicate that to a licensed gasfitter.

What your gas heater flame is telling you

A healthy gas heater often produces a steady blue flame, particularly in conventional appliances. However, some decorative natural gas fireplaces are designed to display a yellow or orange flame to create a more realistic, wood-fire appearance.

If you notice a sudden change in flame colour, such as a heater that normally burns blue developing a yellow or orange flame, or if the flame becomes unstable or excessively sooty, it may indicate the appliance is not operating as intended. According to the Department of Energy, Mines, Industry Regulation and Safety, this can be a sign of incomplete combustion and should be checked promptly by a licensed gasfitter.

In these cases, it’s recommended to have the heater inspected by a licensed gasfitter. Causes can include restricted airflow, burner issues, or general wear and tear, all of which require professional assessment.

Unusual smells during operation

A brief dusty smell may occur when a heater is first used after a long period of inactivity.

Strange noises from the heater

Some operational sounds from a gas heater are normal. New, worsening, or unusual noises are not. Banging, rattling, persistent clicking, or loud popping sounds during operation can indicate components that need inspection. The source could be mechanical wear, airflow issues, or something affecting the burner or heat exchanger. 

Do not attempt to investigate unusual noises by opening or adjusting the heater. Note what you are hearing and when it occurs, and contact a licensed gasfitter to assess the appliance.

The heater is not heating effectively

If your heater is running but struggling to warm the space adequately, taking noticeably longer to reach temperature than it used to, or heating unevenly across rooms, this may indicate a performance issue worth investigating. The cause could be related to the heater itself, a blocked or dirty filter, ductwork, or the unit simply not operating at its intended efficiency. 

As a first step, check whether the heater's filter needs cleaning or replacing, as a blocked filter is a common and easy-to-address cause of poor performance. You can find guidance on filter maintenance in our pre-winter gas heater checklist. If the problem persists after checking the filter, contact a licensed gasfitter.

The heater keeps shutting off or will not ignite

A heater that fails to start, cuts out repeatedly mid-cycle, or displays an error code is indicating a fault that needs professional diagnosis. Repeatedly attempting to force ignition is not recommended and will not resolve an underlying fault. 

If your unit is showing an error code, note the code and your heater's make and model before calling a licensed gasfitter. This information helps them diagnose the issue before arriving and prepares them for the job.

Visible soot, staining, or condensation around the heater

Dark marks, soot deposits, or unusual condensation around the heater or near its flue can indicate a combustion or ventilation issue. These visible signs suggest something may not be operating as it should and warrant professional inspection. 

Do not attempt to clean soot from internal components or investigate the flue yourself. This is a visual indicator to note and report to a licensed gasfitter, not something to address independently. 

What does a gas heater service include? 

A professional gas heater service is a thorough inspection and maintenance check carried out by a licensed gasfitter. It is designed to assess how the heater is operating, identify any wear or developing faults, and confirm the appliance is safe and performing efficiently. This is not something a homeowner should attempt. 

A service commonly includes some or all of the following, depending on the heater type and its condition: 

• Inspecting and cleaning the burner and combustion components 
• Checking gas pressure and supply connections 
• Testing the flue and ventilation for correct operation 
• Inspecting the heat exchanger for cracks or deterioration 
• Testing safety controls, thermostats, and ignition systems 
• Checking for gas leaks at connections and fittings 
• Assessing overall system performance and flagging any components for attention 

The inclusions can vary between providers, heater types, and manufacturers. When booking, ask the gasfitter what their standard service covers and whether there are any additional checks specific to your heater model. If a fault or repair need is identified during the service, a reputable gasfitter will advise you of this separately before carrying out any additional work. 

How much does a gas heater service cost? 

There is no single gas heater service cost that applies across the board. Service costs vary depending on a number of factors, and quoting a specific price without knowing your situation would not give you an accurate picture.

The factors that typically influence what a service costs include: 

• Heater type: ducted gas heating systems are generally more involved to service than a single space heater, and this is reflected in the time and cost required 
• Location: gasfitters in regional or remote areas may include additional travel costs 
• Scope of the visit: a routine maintenance inspection differs from a visit that involves diagnosing an active fault or identifying unknown issues 
• Parts and repairs: if the gasfitter identifies components that need replacing during the service, these will typically be quoted separately 
• Age and condition of the heater: older units or those that have not been serviced recently may require more time and attention 

The most reliable way to understand what a gas heater service will cost for your specific heater and location is to contact two or three licensed gasfitters and ask for a quote, including what is covered in the service. You can find a licensed gasfitter in your area through your state’s relevant licensing authority.

How often should a gas heater be serviced? 

Energy Safe Victoria recommends all gas heaters be serviced at least every two years by a qualified gasfitter, and this guidance is echoed by state regulators across Australia, including WA's Department of Energy, Mines, Industry Regulation and Safety. Your appliance manufacturer may specify a different interval in the product manual, which takes precedence for warranty purposes. 

A practical rule of thumb: the older the heater, the more frequently it warrants attention. 

Timing matters too. Booking a service in autumn before the peak winter period means gasfitters are more likely to have availability, and any issues are identified before you need the heater most.  

For renters in Victoria, servicing obligations are specifically set by law. Under the Residential Tenancies Regulations 2021, rental providers must ensure a gas safety check of all gas installations is conducted every two years by a licensed gasfitter with a Type A appliance servicing endorsement. Renters in other states should confirm current requirements with their property manager or the relevant state tenancy authority, as obligations differ by jurisdiction. 

What happens if you do not service your gas heater? 

Skipping regular servicing does not always result in an immediate or obvious problem. That is partly what makes it easy to postpone. However, allowing minor wear or developing faults to go undetected over time can lead to practical consequences worth considering. 

The goal of servicing is not to prevent every possible outcome but to improve the odds of catching developing issues early, when they are simpler and less expensive to address. 

References

Energy Safe Victoria: Heating your home with gas  

Energy Safe Victoria: Tenants and renting laws 

Victorian Building Authority: Residential Tenancies Regulations 2021  

Better Health Channel (Victoria):  Gas heating - health and safety issues  

Department of Energy, Mines, Industry Regulation and Safety (WA):  Servicing gas appliances  

Energy Safe Victoria:  Gas heater safety (energy.vic.gov.au)

This article is general information only and does not take your specific circumstances into account. Costs, eligibility and connection requirements can differ by state, property type and over time. For appliance selection, servicing and safety advice, speak with a licensed gasfitter and follow the manufacturer’s instructions. 

For supply checks or to report a gas outage in your area, contact Australian Gas Networks on 1300 001 001. 

All information provided in this article was correct at the time of publishing (June 2026)

Want to know more? Give us a call on 1300 001 001 or  click here to learn more about our gas network and connection process, including current eligibility, fees and restrictions in your area.