Why is my boiler not circulating hot water?

Radiators are partially blocked



CAUSE: Another common cause of hot water radiators not circulating is radiators blocked partially. If this happens, then it will lead to the coolant going through the radiators much more slowly than it should. This will thus result in the radiators not circulating enough or at all.

How do you thaw a frozen boiler pipe?





Quote from the video:
Quote from Youtube video: The pipe would be to get a hot water bottle and to put that onto the affected. Area of the pipe. And allow it to defrost. Over a period of time this.

How do you tell if boiler pipes are frozen?

How do I know if the condensate pipe is frozen? If part of your condensate pipework is outside and does freeze during a prolonged period of very cold weather, you might hear a gurgling noise coming from the boiler and if your boiler has a digital display, you may see an ‘EA’ error code too.

Can radiator pipes freeze?

Whatever the exterior of your radiator, whether it is an anthracite finished or a coloured radiator, all radiators will suffer the same internal problems when it comes to freezing pipes.

How do you check if a circulating pump is working?

If the circulator pump is on the RETURN side of the heating piping loop (the usual and better location) then you can feel the pipe at the circulator pump – doesn’t matter which side – in or out flow – since if the pump is running the pipe will get warm, then hot if it is successfully moving hot water out of the boiler

How do you know if you have a bad circulator pump?





6 Signs of a Bad Circulator Pump

  1. Keep hot water flowing. Also known as a recirculator or recirculation pump, your circulator pump is part of your hot water system. …
  2. No water in the system. …
  3. Radiators not getting hot. …
  4. Pump won’t come on or stay on. …
  5. Noisy pump. …
  6. Pump leaking water.


Why is my circulating pump not working?

Circulator pumps can stop working for several reasons: a blown fuse, bad wiring or a dead motor. Troubleshooting the possible causes in a systematic manner ensures you can find the reason your circulator pump isn’t working so you can get it back up and running as soon as possible.

What happens if circulator pump fails?

Circulator Pump Malfunctions



Water will still circulate through the boiler’s system via convection should the pump breakā€¦ but it will be very weak. This will result in a drop in heating power, and when you notice it you should immediately call for repairs.

How much does it cost to change a circulator pump?



Replacing a failed circulator pump can cost as little as $400 or as much as $750 or more for the parts and labor at the time of publication. Cost of just the circulator pump itself falls in the range of $100 to $300 depending on the model your system needs.

Why is my hot water not working but my heating is?

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.

How do I check the water flow in my boiler?

Quote from the video:
Quote from Youtube video: If you use a flow cup. Open the tap for full rate so the cold water taxi rates. This is what they measure in death underneath.

Why am I getting no hot water?



A water heater that produces no hot water may not be getting power, may have a tripped limit switch, or may have one or more failed heating elements. First, check the water heater’s circuit breaker in the service panel to make sure it hasn’t tripped. If the breaker has tripped, switch it off, then switch it back on.

Why have I got no hot water but heating?

In the case that your radiators are heating up but there’s no hot water coming from the taps, then the most likely cause is a broken diverter valve. Combi boilers are fitted with a diverter valve, that opens and closes depending on whether hot water needs to be sent to the radiators or taps.

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. The thermostatic radiator valve (TRV), like the one pictured below, controls the flow of hot water to the radiator.

Why is my radiator heat not working?

Check for Trapped Air and Bleed Your Radiators



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.

Why is my hot water not working but my cold water is?



If you have good water flow (“pressure”) at hot water faucets, but it’s cold, then the water supply piping is not blocked and the problem is in the water heater itself, or in a mixing valve.

How do you unfreeze a hot water pipe?

Here’s a quick lesson on how to thaw a frozen pipe.

  1. Turn on the faucet. Keep it running. …
  2. Apply heat to the frozen area. Slowly apply heat using a hair dryer. …
  3. Continue to apply heat. Don’t stop heating until full water pressure is restored. …
  4. Check all faucets and prevent pipes from freezing in the future.


How do you unclog a hot water pipe?

Quote from the video:
Quote from Youtube video: First turn off the shut-off valves located under your sink twist them clockwise as far as you can next turn on the hot and cold faucet taps to release any water that is still on the lines.