Boiler Advice: Hot Water Working But Radiators Not- Hot Water but No Radiator Heat
If you have heating issues in your home, it can be a real headache for everyone involved and with modern complex heating systems, it can also be quite confusing when figuring out what to do.
In this advice article, we are going to go through some issues and steps one can take when experiencing problems with your radiators or central heating.
That is to say, that your hot water is working OK but your radiators are not coming on or there’s little heat.
We will try to give some simple steps you can take to try and fix or diagnose the issues.
So, without further delay, let’s go through some of the top tips and fixes for radiator heating problems……
Cold or Slightly Warm Radiators:
If you find that your water heater is not as warm as you would like, it may need to vent. When the cold water supply in the system contains more air than hot water, the air rises and exits the system when it is cold, usually finding a home in the radiators.
Air pockets in the radiator: Often air can get trapped in the central heating and block the flow of water, leaving the radiator cold. There are a number of ways you can repair this but the most basic is by bleeding the radiator. You can also check things such as vents, air filters or air ducts depending on the type of system you have.
You can also manipulate the main valve to release air and prevent water from escaping, such as with an air filter or air compressor or even a new radiator if one has just recently been installed.
Additionally, you could find that not all radiators get hot and some take longer to heat up than they used to. If you increase the thermostat temperature to warm them up and then find that you have cold spots, there’s a problem. If you find this is the issue, then we would suggest that particulate dirt as well as air can accumulate in the radiators throughout the home and cause uneven heat distribution, this is more than likely the failure point with many radiator faults.
This particular dirt and excess air pockets can build up over time in your central heating system and blockages could affect the quality of your heating, even stopping it altogether.
Uneven Radiator Heating:
If the bottom part of your radiator gets hot, you may need to ventilate it because it does not circulate hot water from the radiator system. This could be because the water pump shaft is not switched on or at the pump itself.
To solve this problem, you first have to fill the water and then bleed the system again with hot water from the cooling water pump shaft or from a cold water tank.
This will help to prevent the water pump shaft from turning and thus prevent the hot water from circulating from the radiator. If it is not pressurised properly, the boiler does not provide the necessary hot water to heat the house. Now that you know the problem of the circulating hot water heater, you will be able to solve this problem yourself without much difficulty.
Heat Exchangers and Issues:
Another likely issue with many systems is the heat exchanger.
Let’s explain a little further…..A heat exchanger connected to a cold water pipe is penetrated by fine heat rays (60 ° C to 140 ° F) that actually heat the water. An electric pump then pumps the heated water to the radiator, which is usually hidden in the system pipe in a new house.
When there is no central heating, hot water flows continuously through the pipes. If your radiator is cold, first check that you have turned off both the boiler and the central heating in the system, and then check the radiators in your home if you have a problem with the central heating to see if any of them are working.
If only one radiator is a bit warm, there is nothing wrong with the boiler, but if it is only a mild heat, try turning off the vent valve. If one of the radiators is a little warmer, try venting the radiator and place a towel over the vent valve to prevent dirty water from dripping onto the floor.
If a conventional combined boiler makes noise, it means that the bottom of the heating is warm, but the rest is not. For example, if there is a problem with the heat exchanger on one radiator and not on all of them, the radiator can vent, which could cause the problem to be resolved by heating all radiators on a high temp.
The new boiler condenses, which means that a small amount of exhaust gas is turned off before it flows out into the condensate pipes.
When the heat of the house is turned on, a pump starts, draws water from the boiler and pumps it to the radiator. When the house reaches the desired temperature, the pump stops working until the heating is switched off. If you have a pump failure, you may hear whirring or grinding type noises which can indicate a problem which would require a heating engineer to investigate further.
When the temperature drops, heaters which have been unused for a while or that have sat for too long may no longer work. If the weather is frosty in your area and the boiler is still running, try turning off the water heater. After you have left the heater off for about 30 minutes, turn the taps on in the kitchen and bathroom to check that the water is warming up.
If everything heats up, you may want to turn the heating up when the temperature rises. Turn off your central heating and see if it’s hot now, and if so, turn it off.
If the radiator still does not get hot after heating it all up you may want to try loosening the cones on the TRV, try flushing (if it is still cold). If you have done all of the above and the water flow in your system is not even warm at all, you should be aware that there is an air lock in the system and In some cases, the heating system needs to be balanced. If you have a radiator that is very warm and others that are cold, that is not a huge problem, but an unbalanced radiator does not heat both at the same time. As hot water rises, the radiators, not the water, must be balanced.
These are simple tips however you may be better off calling a heating engineer or even in some cases replacing your boiler with a new one. If you are in the market for a new boiler go ahead and try our boiler quote calculator.
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