Cold Air from Your Heater? Here's What Might Be Wrong

It’s frustrating to turn on your heater and feel cold air instead of warmth. As part of the Coldflow team, I’ve seen this happen for a range of reasons – some simple, others more serious. Here are the most common causes and what you should do next.

1. Blocked or Dirty Filters

When filters are clogged, your heating system struggles to push warm air through. This can cause airflow issues and sometimes lead to the system blowing cold air. Cleaning or replacing your filters regularly can prevent this. If the problem persists, it might be time to book a heating repair.

2. Thermostat Settings

It’s worth checking your thermostat. If it’s set to ‘fan only’, your system will circulate air without heating it. Make sure the setting is correct and the temperature is high enough for the heater to kick in.

3. Pilot Light or Ignition Issues

For gas heaters, a pilot light that’s gone out or an ignition fault can stop warm air from being produced. Relighting the pilot light is sometimes simple, but if it keeps going out, you may need a gas heater repair to fix the underlying cause.

4. Duct Problems

Leaks or disconnections in your ductwork can cause heat to escape before it reaches your vents. This is especially common in older ducted systems. Our team can provide ducted heating repairs to restore efficiency.

5. Overheating and Safety Shut-Off

If your heater overheats, it may shut down the heating element as a safety measure, leaving only the fan running. This often happens due to restricted airflow or mechanical faults.

What to Do Next

Start with the basics: check your thermostat, replace or clean your filters, and inspect your pilot light if you have a gas heater. If you still have cold air coming from the vents, it’s best to get a professional inspection. At Coldflow, we handle all types of ducted heating and gas wall heater repairs to get your home warm again quickly.

Contact us today to book a service and have one of our experienced technicians fix your heating system.