Why Does My Hot Water Work But Not My Heating?

If you’ve got hot water, but no central heating then there are more issues it could be if it’s not the thermostat or the boiler pressure. Common reasons for this particular fault are broken diaphragms and airlocks, or a motorised valve failing.

Why is my hot water working but not my radiators?

If your boiler works but the radiators are not heating up, then likely cause could be a faulty boiler pump or your central heating controls. If your boiler works but the radiators are cold, check that the thermostat or timer is working correctly.

Why does my heating only work when the hot water is on?

The valve itself is actually opening hence the heating system is getting hot when the hot water is on but the boiler is only fired up when the hot water motorised valve is open, the boiler should fire up if either valve is open.

Why will my heating not come on?

Check your thermostats
If the thermostat is set too low, the heating will not come on until the room temperature is lower than the temperature you have set the thermostat to. Turn the thermostat up to its highest setting and see if this resolves the problem.

Why are none of my radiators not getting hot?

If just one (or a few) of your radiators aren’t heating up, the most common reason for this is trapped air. If you’ve just turned the heating back on after the summer, air can become trapped in your radiators, causing them to be warm at the bottom but cold at the top.Your radiator should soon be nice and warm.

Why are my radiators cold when the heating is on?

Why is one radiator cold when the heating is on? One cold radiator usually indicates that either there is air in the system or there is a stuck valve within that radiator.To check if the valve is stuck, you can remove the rotatable head on the TRV to reveal a raised pin beneath it.

Why isn’t my boiler heating my water?

If the boiler pressure is too high or too low, this can result in your combi boiler not producing hot water.This should release pressure. If this doesn’t work, it may be possible that your boiler has a broken part, and you’ll need to consult an engineer. Boiler leaks can also cause low pressure.

How do I know if my diverter valve is working?

After you remove the lid of the boiler, you have to locate the diverter valve mechanism. Run tap water on hot and observe the diverter valve. If you run hot water, the valve is supposed to close in order to divert it to the tap, meaning it should move. If you see no movement, then it’s stuck.

Where is the diverter valve?

It’s usually a lever that’s situated behind the bath taps that you can pull up or push down. System and conventional boilers don’t require a diverter valve. This is because the hot water they produce is stored in a hot water cylinder.

Does hot water need to be on for central heating to work?

A central heating system has pipework and radiators which are connected to a boiler.It only needs to control the heating, as it heats hot water on demand. Hot water is available whenever you turn on the hot water taps and so does not need a cylinder to store it in.

Why do I have no heating or hot water?

No heating or hot water
This issue can be caused by anything from faulty motorised valves, broken system diaphragms and airlocks, to low pressure or a broken thermostat.

Why is my heating thermostat not working?

If there’s no change in your home’s temperature when you adjust the temperature, or the display is unlit or unresponsive, your thermostat may be broken, or the batteries need replacing.It could be a wiring defect in the thermostat that prevents electrical signals to be sent to your cooling/heating system.

How do I know if my central heating pump is broken?

Circulating pump not working?

1. The water flow pipe isn’t hot despite the pump running.
2. A water leak coming from the pump.
3. The pump is making unusual noises.
4. The pump casing feels hot.
5. Some or all of your radiators aren’t heating up.
6. You have no hot water.

Why is my heating not coming on after summer?

Most heating systems work on a thermostat and won’t come on until the temperature falls below that set on the thermostat. If it doesn’t come on it may just not be cold enough!If a radiator doesn’t come on at all or isn’t warm enough just check the valve that controls the temperature on the radiator itself.

Do radiators need to be on to bleed them?

You must not bleed a radiator when the heating is turned on as it may be too hot to touch and hot water could spray out of it. Ensure the heating is turned off before you begin bleeding a radiator. Letting out air when the pump is running will only draw more air into the system from elsewhere.

How long does it take to replace a diverter valve?

You should call a gas safe registered engineer if you need to replace the diverter valve or service the working parts of the valve after you’ve diagnosed the problem. It shouldn‘t take more than an hour for this to be done on a boiler under eight years old, as parts should be readily available.

How do you change a diverter valve?

Diverter Valve on a Three-Valve Shower

1. Loosen the screw on the handle.
2. Unscrew and remove the handle.
3. Remove the sleeve over the diverter.
4. Remove the diverter using a socket wrench.
5. Unscrew the set screw.
6. Unscrew spigot from the wall.

How long does hot water last in tank?

As an estimate, the water in your tank should stay hot for a day or two. The larger the tank, the greater the heat loss will be, and it depends on the quality of your tank as well as the form of insulation you have.

What temperature should a hot water boiler be set at?

180°F.
The average setting for a gas-powered hot water boiler is 180°F. This provides the appropriate level needed for most cold weather temperatures. If you can raise the temperature manually, do not set it any higher than 210°F (which is often the limit), and try to remain down at 190°F if you need the extra heat.

Will washing machine work if hot water heater is broken?

If your washing machine tries to pull hot water from your water heater, and it gets cold water instead, it will just wash your clothes in that cold water.If you do, there should be no problem using it while your water heater is broken.