When the temperature drops, the last thing you want is a heating system that doesn’t work. Unfortunately many households in Australia are experiencing heating problems just when they need it most. Some are minor and easy to fix, others need a professional’s touch.

Recognising the signs early can save you from discomfort—and big repair bills.

Here’s a practical guide to 10 common heating problems and what you can do about them.

1. Radiators not heating up

The problem: If your radiators are cold at the top and warm at the bottom it’s usually trapped air in the system. In other cases an entire radiator will be cold due to a faulty valve or sludge build up.

The fix: Bleed your radiators to release the trapped air using a radiator key. Make sure you have a cloth under the valve to catch any drips. If the problem persists you may need to flush the system or replace sticky valves.

2. Boiler keeps turning off

The problem: A boiler that keeps shutting itself down could be due to low water pressure, a blocked condensate pipe or a thermostat issue. This type of problem happens more often in colder months when external pipes freeze.

The fix: After Hours Air Conditioning suggests that: “First check the water pressure gauge. If it’s below one bar, top it up using the filling loop. If your condensate pipe is frozen, thaw it gently with warm (not boiling) water. If unsure, call a heating engineer.”

3. No hot water

The problem: No hot water is incredibly frustrating especially in winter. This could be due to a faulty diverter valve, thermostat problems or a broken motorised valve.

The fix: Check if the boiler is firing up when you turn on the hot tap. If not you may need to replace the diverter valve. Make sure your thermostat is set correctly and hasn’t run out of battery. If nothing changes, get a professional to investigate.

4. Uneven Heating

The problem: Some rooms are like saunas while others are cold. Usually this is due to poor balancing in the heating system.

The fix: You need to balance your radiators. This involves adjusting the lockshield valves to control how much hot water gets into each radiator. Start with the radiator nearest the boiler and work your way around the house.

5. Noisy pipes or radiators

The problem: Banging, gurgling or whistling sounds are usually signs of trapped air, pressure fluctuations or limescale build up. These sounds are more common in older systems.

The fix: Bleed the radiators to release air. If the noise continues, check the boiler’s pressure and look for signs of sludge or scale. A power flush or descale may be needed in older systems.

6. Thermostat not working

The problem: If your thermostat doesn’t seem to trigger the heating it could be due to old age, poor placement or dead batteries.

The fix: Replace the batteries and make sure the thermostat is located away from direct sunlight or draughts. If the problem remains it might be time to upgrade to a modern programmable thermostat for better efficiency.

It is advised to set your thermostat to 18–20°C during the winter season.

7. Pilot light keeps going out

The problem: In older boilers with pilot lights a flame that won’t stay lit could be due to a faulty thermocouple or debris blocking the gas supply.

The fix: Turn off the boiler and inspect the pilot light. Clean the area around it carefully. If the thermocouple is damaged or worn out it will need replacing. For gas related work always call a Gas Safe registered engineer.

8. Low boiler pressure

The problem: When boiler pressure drops too low it affects both heating and hot water. This can be due to a leak, bleeding radiators or a failed pressure relief valve.

The fix: First check for visible leaks around radiators and pipes. Then use the filling loop to re-pressurise the system. If the pressure keeps dropping a hidden leak or faulty valve could be to blame—time to call in a pro.

9. Boiler making loud or strange noises

The problem: A noisy boiler may mean kettling—a term used when limescale or sludge builds up on the heat exchanger causing water to overheat and boil.

The fix: You can try using a chemical inhibitor to break down sludge. If the problem is advanced a professional power flush may be needed. In hard water areas installing a scale reducer is a smart preventative measure.

10. Heating timer or programmer not working

The problem: If your heating doesn’t come on when it should, the timer or programmer might be faulty. This is especially common after a power cut or with older systems.

The fix: Reset your timer according to the user manual. Check the time settings and make sure the clock is correct. If the programmer is faulty or very old, replace it with a new digital or smart one for better reliability and energy efficiency.

Know when to call the experts

Many heating problems can be fixed with a bit of basic knowledge and a radiator key. But when it comes to gas safety or anything involving complex boiler parts don’t risk a DIY disaster.

Regular servicing by a Gas Safe engineer is not just smart—it’s essential. It can help you avoid many of these issues altogether especially before winter hits.

Staying warm shouldn’t be a struggle. A well-maintained heating system means comfort, safety and peace of mind even on the coldest of nights.