- The thermostatic valves start making a repetitive knocking sound, I think this happens when they reach their set temperature and they're trying to shut down the flow to the radiator The only way I've found to stop it is to put them on full so only the boiler controls the temperature, or to remove the thermostat from the valve.
- If you turn down the valve at the other end, it will reduce flow through the radiator and noise will probably stop. The other valve might have a knob, but more likely a plastic cap retained by a small screw. You take the cap off, and use a very small spanner to wind the spindle down until fully closed, then open it.
- A good reason why your thermostatic radiator valves are stuck on one position could be that you left the valves on stuck position for quite a long time. When the valves cool down, they start sticking to each other. The good thing is that troubleshooting a stuck radiator thermostat is relatively easy.
- Thermostatic valve(s) fitted wrong way round - usually happens when the system stabilises - opening one valve fixes temporarily. Boiler thermostat set too high - try turning it down (not the room thermostat) Low water level caused by lack of water in the system - could be a stuck cistern valve.
Knocking Noise Coming From Radiators ?
A Thermostatic Radiator Valve or TRV set to its highest heat. Building Regulations state that all new and modified wet central heating systems must have a TRV fitted to every radiator (apart from one where the room thermostat or programmable thermostat is installed, typically in the hall).
![Radiator Radiator](/uploads/1/1/8/2/118216552/707056799.jpg)
We can help you. Here are some of the causes.
This is one of the most common problems faced by homeowners. Air trapped inside the radiator, or the limescale building up on the radiator metal from inside, are the two most common reasons behind this problem. Here is how you can fix a knocking noise coming from radiators.
Letting Air Out Of the Radiator
You can let the air out of the radiator by allowing it to bleed. First of all, you will have to locate the highest bleeder valve on your radiator. It looks like a hex nut with a head that has a little spout. In some cases, the nut is equipped with a special head that requires a special tool to unscrew, which can be bought in your local DIY store.
Before opening the bleed valve, turn the radiator ‘on’ for about an hour. This will ensure the system is heated up thoroughly and builds up enough pressure. Now turn the boiler ‘off’. Place a bucket directly under the bleed valve on the floor and slowly unscrew it. You will have to be very careful while doing this, as the radiator and water in it are still hot. As soon as you unscrew the valve, air, along with water starts coming out with a sputtering like sound.
After sometime, when you no longer hear a knocking noise coming from radiators and the water starts flowing smoothly, close the valve. Turn on the radiator and check for the knocking and banging sounds. If they still persist, repeat the process again.
Power Flushing
If you are still unable to resolve the problem, you may consider power flushing. This is also an easy procedure. But, due to the nature of the chemicals involved, it is recommended to hire a professional to do it for you.
First step involves loosening of all the debris and the limescales built up inside the radiator, with the help of fast flowing fresh water mixed with chemicals. Once all the sludge is loosened, it is flushed out of the radiator with some more fresh water. Power flushing ensures effective boiler performance and reduced power consumption.
Other possible reasons for the knocking noise coming from radiators
![Noisy thermostatic radiator valves problems transmission Noisy thermostatic radiator valves problems transmission](/uploads/1/1/8/2/118216552/368656191.jpg)
- incorrect flow rate
- inadequately filled feed tank
- faulty pump
If you are not sure of the exact reason, it is always a better idea to seek the help of a skilled professional.
We are gas safe registered and can fix any problem in East London having to do with any type of gas appliances. Contact us today for any Knocking Noise Coming From Radiators.
If you are having problems heating the home, and have isolated the problem to one specific radiator valve, then you will most likely have a problem with the radiator valves. Also known as thermostatic radiator valves, or TRVs, these can usually be used to control the heating on the home, and to give you a say in the temperature of a particular room. However, these little control valves can have some issues which mean that your radiator doesn’t come on at all. Common issues might include leaking and sticking.
Radiator valve is leaking
Wireless Radiator Thermostatic Valve
This is a problem that can easily be spotted when you are looking at the radiator. The ground around the valve will be wet, and when the head of the valve is removed, water can be seen pooled around the pin. The first step should be to turn off the water and the heating system. Starting at the top of the valve, try to spot where the valve is leaking. The most common issue causing leaking is a loose pin or securing nut. If this is not the issue, then you may need to call in a plumber.
Radiator valve is stuck
Thermostatic Radiator Valves Old Radiators
TRVs are notorious for becoming stuck, so that even when you turn the head to indicate a lower heat, the radiator insists in pumping out the maximum, overheating the room. What has happened is the valve has locked into the open position (when the radiator is cool that is the closed position). You should start by turning the valve to the highest setting, and then taking off the head. You will see a piston, which should be moving but will most likely be still, or seized. Used WD40 to loosen the piston, and press it into place. If this doesn’t work, then you will either need a replacement valve, or a plumber to assist you.