Fast, Professional Gas Heater Repairs Across Melbourne
A gas heater that stops working is never convenient, especially in the middle of a Melbourne winter. Whether your heater is failing to ignite, blowing cold air, cutting out unexpectedly or displaying an error code, the Gas Experts Melbourne team will diagnose the fault and get your home warm again as quickly as possible.
We offer same-day gas heater repairs across Melbourne. Our licensed gas fitters carry a wide range of parts on the van, which means most repairs are completed in a single visit. No waiting days for parts to arrive. No second call-out fees. One visit, one fixed price, problem solved.
Every repair also includes a complimentary gas safety check. So you don't just get a fix: you get the peace of mind that your heater is safe to run.
Common Gas Heater Faults We Repair
If your heater is showing any of the symptoms below, call us. Most of these faults can be diagnosed and repaired in a single visit.
What you notice: You press the power or ignition button and nothing happens. No flame, no click, no heat.
Common causes
- Faulty ignition module or spark igniter
- Dirty or corroded pilot assembly
- Faulty thermocouple or thermopile (the safety sensor that detects whether the pilot is lit)
- Gas supply issue check that your gas meter is on and other gas appliances are working
- Faulty PCB (printed circuit board) more common in older heaters
What to do: Do not repeatedly attempt to relight the heater if it is not igniting. If you smell gas during ignition attempts, turn off the gas at the meter and call us immediately. Otherwise, book a repair and we will diagnose the specific fault.
What you notice: The heater turns on, the fan runs, but the air coming out is not warm or is barely warm.
Common causes
- Thermostat fault the heater thinks it has reached the set temperature when it hasn't
- Flame failure the main burner is not lighting even though the pilot is lit
- Faulty gas valve not allowing sufficient gas flow to the main burner
- Dirty or restricted burner insufficient combustion to generate heat
- Cracked or failing heat exchanger a serious fault that also carries a carbon monoxide risk
What to do: Check your thermostat is set to the correct temperature first. If the heater is running and no heat is being produced, this is a fault requiring professional diagnosis. A cracked heat exchanger is a safety issue: call us promptly.
What you notice: The heater starts up normally but shuts off after a few minutes, often before the room reaches the set temperature. It may restart and shut off again in a cycle.
Common causes
- Overheating caused by blocked filters, restricted airflow or a clogged heat exchanger
- Faulty thermostat reading the temperature incorrectly
- Safety overheat switch activating due to a genuine overheating fault
- Flame sensor or thermocouple fault causing the heater to think the flame has gone out
What to do: Check and clean the filter first. If the filter is clean and the heater is still cutting out, this requires a professional diagnosis. Do not ignore a heater that repeatedly overheats, it is a safety issue.
What you notice: You can light the pilot light but when you release the button, the pilot goes out. Or the pilot light goes out intermittently during operation.
Common causes
- Faulty thermocouple the most common cause. The thermocouple is a safety device that detects the pilot flame and allows gas to flow. When it fails, it signals that the pilot is out even when it is lit, and the gas valve closes.
- Draught or air movement near the heater extinguishing the pilot
- Contaminated or blocked pilot jet
- Low gas pressure
What to do: A thermocouple is a straightforward and relatively inexpensive repair. Call us to have it diagnosed and replaced in a single visit.
What you notice: A flashing light sequence, a digital error code on the display, or a combination of indicator lights that doesn't match normal operation.
Common causes: Varies by brand and code. Error codes typically indicate:
- Ignition failure
- Flame sensor fault
- Overheating or overheat safety lockout
- Fan fault or blocked flue
- Gas pressure fault
- PCB fault
What to do: Note the error code or describe the flashing pattern and visit our Gas Heater Error Codes guide for your brand. Call us if the code indicates an ongoing fault, most faults behind error codes require professional diagnosis and parts.
What you notice: A gas smell (rotten egg or sulphur-like odour) coming from or near the heater, either when it is running or when it is turned off.
Common causes
- A gas leak at the connections, seals or fittings
- Incomplete combustion producing mercaptan-like odour
- Gas accumulation from a failed ignition attempt that didn't light
What to do: This is a safety emergency. Turn off your gas at the meter immediately, open all windows and doors, do not use any light switches or appliances, evacuate if the smell is strong, and call us immediately from outside the property. Do not attempt to use the heater until it has been inspected and cleared by a licensed gas fitter.
What you notice: Banging, rattling, grinding, squealing or loud clicking sounds during operation or when starting up.
Common causes
- Banging/booming on startup Delayed ignition caused by gas accumulating before the burner lights. Can be due to a dirty burner or low gas pressure.
- Rattling Loose casing, panels or internal components.
- Grinding or squealing Worn fan motor bearings.
- Persistent clicking Faulty ignition module that won't stop trying to ignite.
What to do: A booming startup sound (known as delayed ignition) and grinding from the fan motor should both be addressed promptly. These are not just annoyances: they indicate developing faults that will worsen if left unattended.
What you notice: The heater runs at full output continuously, does not cycle off when the set temperature is reached, or the fan continues to run after the heater is turned off.
Common causes
- Faulty thermostat not sensing the room temperature correctly
- Stuck or faulty gas valve holding the main burner open
- Control PCB fault
- Fan continuing to run after shutdown is normal, this is the cooling down cycle. If it runs for more than 10-15 minutes after shutdown, the overheat protection may have activated.
What to do: A heater running at constant full output will significantly increase your gas bill. If your thermostat is set to a reasonable temperature and the heater is not cycling, call us for a diagnosis.
What you notice: The heater is running but the heat output is noticeably less than normal. The room takes much longer to warm up or never reaches a comfortable temperature.
Common causes
- Dirty or blocked burner the most common cause. Carbon deposits restrict gas flow and reduce heat output.
- Partially blocked filters reducing airflow (ducted systems)
- Low gas pressure from a supply issue
- Partially failing heat exchanger
- Thermostat calibration drift
What to do: A drop in heat output is often resolved by a professional clean and service. If it persists after a service, a gas pressure test will identify a supply issue.
What you notice: Your gas bill has increased significantly without a change in how you use the heater.
Common causes
- Dirty burner reducing combustion efficiency the heater burns more gas to produce the same heat
- Thermostat running the heater for longer than necessary
- Partial heat exchanger failure reducing heat transfer efficiency
- Heater reaching end of service life and running inefficiently
What to do: An annual service typically resolves efficiency problems. If your bill has spiked significantly, call us for a service and efficiency check.
Why Gas Heater Faults Develop
Understanding why gas heaters break down helps explain why regular servicing is so important. Here is what happens inside a heater over time without maintenance.
Dust and debris accumulation. Melbourne homes generate dust constantly. Gas heaters draw air in and filter it through the heat exchanger and burner. Over time, dust builds up on burner jets, inside the heat exchanger and on fan blades. This restricts airflow, reduces combustion efficiency and causes overheating. A dirty burner is the root cause of more gas heater faults than any other single factor.
Component wear. Thermocouples, ignition modules, gas valves and PCBs are all mechanical and electronic components with a finite lifespan. They wear gradually. The first sign is often intermittent operation, the heater works sometimes and not others. Left unserviced, intermittent faults become total failures, usually at the worst possible time.
Seal and connection deterioration. Gas connections, seals and fittings are subject to thermal cycling, expanding and contracting with every heating cycle. Over years of use, this causes micro-leaks to develop. Regular servicing includes a gas pressure test that detects these leaks before they become dangerous.
Heat exchanger fatigue. The heat exchanger is the most critical safety component in a gas heater. It separates the combustion gases (including carbon monoxide) from the air circulating into your home. Repeated thermal cycling causes metal fatigue and, eventually, cracks. A cracked heat exchanger allows combustion gases to enter the living space. This is why annual servicing and a CO test are not optional.
How Our Repair Service Works
- 1
Call us on 0468 279 956 or fill in our online booking form. Describe what the heater is doing and we'll provide an estimate and confirm a time. No call-out fee when you book online.
- 2
We offer same-day service across Melbourne. Call before noon for the best chance of a same-day appointment. Our licensed gas fitter will arrive at the agreed time and call when on the way.
- 3
We carry out a systematic fault diagnosis using professional testing equipment. We will identify the root cause of the fault: not just the symptom.
- 4
Once the fault is identified, we give you a clear, fixed price for the repair before we start. No hidden charges. No hourly rate. You approve the work before we lift a spanner.
- 5
We carry out the repair and conduct a full gas safety check and carbon monoxide test on completion. You receive a written report documenting what was found, what was repaired and the results of the safety checks.
Heater Not Working? Call Now.
Same-day gas heater repairs available across Melbourne. Our licensed gas fitters are on the road daily. Call before noon for same-day service. Upfront pricing. No call-out fee when you book online.
Most Repairs Completed in One Visit
Our gas fitters carry a comprehensive range of parts and components on the van. This means the majority of gas heater repairs, particularly the most common ones, are completed on the first visit with no need for a return call.
If a part is not on the van, we will source it and return as quickly as possible. We will always give you an honest estimate of the parts lead time before you commit to the repair.
Parts and components we commonly carry
- Thermocouples and thermopiles (all major sizes)
- Ignition modules and igniters
- Pilot assemblies
- Gas valves (common models)
- Fan motors (common models)
- PCB boards (selected popular brands)
- Flame sensors
- Thermostat controllers
- Filter media
All Gas Heater Brands Repaired
Our licensed gas fitters are trained and experienced across every major gas heater brand sold in Australia. Whatever is installed in your home, we repair it.
Why Melbourne Homeowners Choose Gas Experts Melbourne for Repairs
