Common Heating Unit Problems

Published by
31 January 2020
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Winter season is the time when there is a dire need for us to warm up our homes. Especially when it’s cold outside, the first snow has fallen, and you have to get up early to go to work. We don’t realize the gravity of the situation until we turn on our bathroom taps or turn on the shower. The water is icy cold and after waiting for a couple of minutes still, there is no warm water.

This is is when you call your heating installation companies to replace your broken heating unit or call a professional like a plumber to fix the heating unit. As long as the heating works, everything is fine. In the event of a malfunction or even a failure, the heating system becomes the focus. Unfortunately, this happens when you turn on your heating after several months in the winter season. Probably it has some gas leaks or other issues that were not identified before.

In these situations, you need to hire an expert. Lets say you live in North Shore in Australia where my sister lives, just type into Google "plumber in North Shore" or "plumbers near me" and you will find a lot that will help you and fix your heating unit and get it running efficiently.

Following are some common plumbing and gas problems:

1.     The Heating System is Down

If the heating system is completely cold, even though the thermostats are on, or in the worse case does not start at all, this may be due to its settings not being correct. Due to advancements in technology most heating units are synced to our mobile devices or laptops. First, check the settings of the heating unit before calling in a professional.

A quick look at the manometer also shows the water pressure in the system. If this falls below 1.0 bar, this can be responsible for the failure of the heating. Also, check whether the circulation pump is switched on and running smoothly. Because this ensures that the heating water is distributed in the system.

Finally, when it happens repeatedly that the fuel ran out early and the heating, therefore, remains cold then find the cheapest specialist company to get your heating unit fixed.

2.     The Radiators Fail to Heat Up

If the radiator only gets warm at the top or only at the bottom, then the heating unit will not work to its optimum level. As a result, the room temperature does not reach the required level. The reason is usually very simple there is too much air in the heating system, especially at the beginning of the heating season. As a result, the heat is not evenly distributed.

A quick fix to the problem is to turn on all the radiators, wait for a little while, and then open the individual radiators until all the air has escaped. Then the radiators should start working again and heat the room quickly.

The reason may also be that the setting of the heating system is not at the optimal level. This is also reflected in the fact that the room is not heated to the set temperature. Hydraulic balancing, which is carried out by a specialist, helps here.

3.     The Heating Unit is Making Noise

There are continuous whistles and gurgles whenever you turn on the heating unit. Which is usually annoying, but it is harmless. By opening the vents often the noises disappear.

Homeowners can easily open the vent of the heating themselves. Tenants should inform the property manager or the caretaker. If the heating noises are not gone afterward, a specialist company should be consulted.

Tip: When the heating is turned on, it is normal to hear the water flowing for a while.

Knocking and cracking sounds can be heard if the pipes are too close together and they touch. The pipe with warm heating water expands and then touches the cold-water pipe. The only help here is to relocate or realign the heating pipes. Since the wall has to be opened for this, this is a major repair that incurs costs.

Rattling can occur if the radiator’s supply and return pipes have been swapped. Sometimes it happens that this is not recognized when installing the heater. The radiators get warm, but the heating water flows through the heating valves in the opposite direction. This creates rattling. To remedy this, a heating installer must install other valves.

Tip: Tenants should always inform the house owner, the property manager or the responsible caretaker and not fix the heating unit themselves.

How do you test that yourself? Turn off the heating completely and let it cool down. Then the heater is turned on again. If the lower heating pipe warms up first, the flow and return have been incorrectly installed.

If the heater makes a clear humming sound, it can have a variety of triggers. From a defective pump and loose pipes to incorrect heating settings - if you are not a specialist, you will hardly be able to tell the differences. With this non-specific sound, you should let an experienced expert come. It is advisable to act quickly because the problem can also get worse.

Especially with heating units that use oil as fuel, there may be unpleasant squeaking noises on the burner. Here you should switch off the heating as quickly as possible and consult a specialist. This noise may be caused by insufficient oil getting into the burner.

4.     There is a Leak in the Heating Unit

If the heater loses water, there can be various reasons for this. For example, old and porous seals can cause water to escape at the connection point. An expert should replace the seals to avoid major consequential damage.

However, radiators or pipes can also leak. This can be caused by rust, defective products or external damage. Finding and correcting these defects is usually time-consuming and also cost-intensive. A heating installer should inspect and repair the damage as quickly as possible. Because water damage increases over time if it goes unnoticed.

5.     The Heating Sensor Not Working

If the heating becomes warm but does not regulate when the room temperature is reached, this may also be due to a defective thermostat valve. If you suspect that the room is getting too warm, simply switch off the radiator. In the event of a defect, it remains warm and does not cool down.

If only the pin is stuck in the thermostatic head, you can easily fix this with a soulful sleep on the spindle pin. This often happens when the heating thermostats have been switched off completely during the summer.

Tip: Never turn off the heating thermostats completely during the summer. Otherwise, the valve pin can get stuck.

If the radiator temperature is controlled by an external sensor, it can happen that it has been covered. A ceiling, curtain or piece of furniture can separate the sensor from the room air in such a way that it can no longer function. If the interference factor is removed, the control of the radiator should also be. Here are the major reasons to hire a professional plumber in certain situations.


If you encounter one of the above issues with your plumbing and gas at home, it is a good idea to contact a specialist or a professional to come and fix it. You should not take these problems lightly as they can lead to much greater damage and cause your entire heating unit to break down.

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