If your ducted heating is not working, the good news is that most faults can be traced to one of five causes. You can safely rule out several yourself before calling anyone. Work through the checks below in order. If you get to the end and it’s still not heating, that’s your sign to call a licensed technician rather than keep troubleshooting.
Start With the Checks You Can Safely Do Yourself
These are the causes almost anyone can check without opening up the unit or touching any gas or electrical components.
Thermostat, Batteries, and Power Supply
Start here every time, even if it feels too simple to be the answer. Check the thermostat is set to heat mode and to a temperature above the current room temperature. If it’s a battery-powered thermostat, flat batteries are one of the most common reasons a system stops responding altogether, even though the unit itself is fine. Also check that the circuit breaker for the heating system hasn’t tripped. These three checks take a couple of minutes and rule out the most common causes before you move on to anything more involved.
Ducted Heating Pilot Light: What to Check
If your system runs on gas, a dead pilot light is one of the most common reasons it stops producing heat entirely. Most gas ducted heating units have a small viewing window or panel where you can see whether the pilot light is lit. If it’s out, most units have instructions printed on a plate near the pilot assembly that let you relight it safely yourself.
This stops being a DIY job if the pilot light won’t stay lit after relighting, or if you smell gas at any point. Repeated pilot outages usually point to a faulty thermocouple or a gas supply issue, and both need a licensed gas fitter rather than repeated resetting. If that’s what you’re dealing with, our Gas Fitting team handles this kind of fault regularly.
Blocked Filter and Reduced Airflow
If you’ve checked the thermostat and the pilot light and the system still isn’t heating properly, a blocked filter is often the next most likely cause. A clogged filter restricts airflow enough that you can end up with ducted heating blowing cold air instead of warm air, even though the system is technically still running. This happens because reduced airflow across the heat exchanger stops the air from picking up enough heat before it reaches the vents.
Check your filter and clean or replace it if it’s visibly dirty. This is a straightforward job on most systems and one of the more common reasons heating output drops off gradually rather than stopping all at once.
When the Fault Needs a Licensed Technician
The two causes below are where DIY troubleshooting should stop. Both usually mean something inside the system needs to be assessed by a licensed technician.
Zone Controller Faults
If some rooms are heating fine while others stay cold, and it’s not a filter or airflow issue, a zone controller fault is a likely cause. The zone controller directs airflow to different parts of the house, and when it fails, it can leave certain zones stuck closed or unresponsive to the thermostat. Unlike the checks above, this isn’t something to diagnose or open up yourself. Zone controller repairs on a ducted gas system are handled by a licensed gas fitter, the same trade that covers other ducted heating faults.
Ducted Heating Won’t Turn On?
If your ducted heating won’t turn on at all, with no fan noise, no ignition, and nothing happening when you switch it on, this points to an ignition fault rather than any of the causes above. Repeated clicking without the system firing, or the unit shutting itself off shortly after starting, are both signs of this.
At this point, stop troubleshooting and call a licensed technician. Ignition faults can involve gas components, electrical components, or both, and Victorian regulations require this kind of work to be carried out by a licensed gas fitter or electrician depending on what’s actually faulty.
Run Through the Checks in This Order
If your ducted heating is not working and you want the short version, work through these in sequence and stop at whichever one applies:
- Thermostat and power: check settings, batteries, and the breaker. Safe to check yourself.
- Pilot light (gas systems): check if it’s lit and relight if needed. Safe to check yourself, unless it won’t stay lit or you smell gas.
- Filter and airflow: check for a blocked filter causing weak or cold airflow. Safe to check yourself.
- Zone controller: uneven heating between rooms with no other explanation. Call a licensed gas fitter.
- Ignition fault: system won’t fire up at all. Call a licensed technician.
What Melbourne Homeowners Usually Ask Next
Is it safe to relight a gas pilot light myself?
In most cases, yes, if the pilot light has simply gone out and there’s no smell of gas. If it won’t stay lit after a couple of attempts, or you can smell gas at any point, stop and call a licensed gas fitter rather than continuing to relight it.
How much does a ducted heating repair usually involve?
It depends on the cause. A pilot light or filter issue is often a quick fix, while a zone controller or ignition fault typically needs a proper diagnosis before a technician can say what’s involved. We provide upfront quotes before any work begins.
Can a blocked filter cause a gas smell?
No. A blocked filter affects airflow and heating output, not gas supply. If you can smell gas, that’s a separate and more urgent issue, and you should contact a licensed gas fitter straight away.
How urgent is a zone controller fault?
It’s not usually a safety issue, but it does mean part of your home isn’t being heated properly. It’s worth getting looked at sooner rather than later, particularly heading into the colder months.
Still Not Heating? We’re Available 24/7 to Sort It
If you’ve been through these checks and your system still isn’t working, it’s time to stop guessing and get a licensed technician out to have a proper look. Our team handles Ducted Heating Systems faults across all Melbourne suburbs, 24 hours a day, seven days a week, including weekends and public holidays. Call us any time or book online.
Recent Comments