13 Reasons Why Your Boiler is not working ?

Reason 1 : Thermostat Issues

The thermostat is the most common element of the boiler to malfunction. If the thermostat is not displaying the correct temperature or is turning the heat on and off when it shouldn’t, you might want to replace it. Although it might be possible that the thermostat is not set properly or that you might have misjudged your home temperature, it also might be possible that the thermostat is faulty.

Reason 2 : Boiler not igniting

If the boiler does not ignite you could be facing several issues.

1. First check for any signs of internal controls failure, and reset or replace them. The boiler might have overheated and the overheat cut-out did not reset.

2. Another likely possibility is that the supply fuse might have blown out. The boiler heat might not have pilot flame, in which case check for incorrectly installed nozzle, or insufficient gas to the pilot. Additionally, if the pilot flame does ignite but fails immediately, check the flame detector voltage. If the thermocouple voltage is low, you should replace it. 3. If the burner does not light, look for fuel leaks. And if all above fails, check if the ignition spark is present. If not, there could be several reasons such as short circuiting, carbon deposits, and excessive electrode gap, among others.

Reason 3 : Boiler Pilot Light Keeps Going Out

If you find that your boiler pilot light keeps going out and will not stay on, there are several things you can check and fix. Below is a list of reasons why this may be happening to your boiler.

Pilot Is Dirty
Your pilot light may be going out because it is simply dirty and filled with soot. Soot usually collects on the thermocouple. To restore the dirty thermocouple and pilot, take out a rag and a little warm soapy water and give it a good clean. You can use cue-tips to get around the little edges and corners.
Thermocouple Is Old

An old thermocouple may malfunction because it worn out and needs to be replaced. This will cause your pilot light to go out.

Gas Valve Problems

The gas valve may be worn or malfunctioning. Check it and replace it if necessary. This should be replaced by a certified HVAC contractor that is familiar with your type of boiler.

Seal Is Not Sealed

Check the seals. If they are no longer forming a complete seal, you may want to replace them.

Over Heat Switch

Many boilers have a switch that detects overheating. Check the switch to see if it is tripping. The thermostat may be a problem causing this to occur.

Reason 4 : Boiler keeps switching off

1. If your boiler keeps switching off, there might be an issue with water pressure.

2. Thermostat might be default.

2. lack of water flow.

Reason 5 : Cold or Inconsistent Water temperature

Perpetually cold water in the shower is a clear indicator of a malfunctioning boiler. Believe it or not, if the water is too hot, this can also signify an issue with the boiler unit. Whether it is too hot or too cold, inconsistent water temperature is often a sign of malfunction. A likely cause for the lack of hot water could be a malfunction in the heating element, while excessive temperatures can be caused by a faulty thermostat.

Reason 6 : Boiler overheats

If your boiler is overheating, check the voltage, safety switches and temperature settings because a likely cause of overheating is a failure in the system controls. The problem could also lie with the high-limit thermostat being activated as a result of control thermostat failure.

Reason 7 : Kettling

Sometimes a strange sound resembling a boiling kettle can come out of the boiler. This often happens when scale or sludge build up inside the heat exchanger. Deposited sludge can reduce the flow of water in the heat exchanger, overheating the water and causing it to boil. This often happens with locations that have hard water, but not necessarily. This issue can significantly impact your energy bill and shorten the boiler’s lifespan.

Reason 8 : Oil/Gas Odor

Any unusual smells can be a sign of serious trouble. In case you feel an unpleasant oil or gas odor, open the windows near your boiler, turn off the control valve and leave your house. This issue is best solved by contacting an emergency boiler repair service and not on your own, because of potential carbon monoxide poisoning. That is why it is always a good idea to install a carbon monoxide monitor if your home appliances are fueled by natural gas. If the alarm goes off, evacuate your home and seek professional help.

Reason 9 : Pilot light is off

If your boiler is not working, the first thing you should check the circuit breaker switch.

Reason 10 : Condensate pipe freezing

During extremely cold weather the condensation in this pipe may freeze and cause a blockage this in turn causes a blockage which makes the condensate ‘back up’ into the boiler and cause a shutdown.

Reason 11 : Strange banging noises

1. The most serious and least likely cause is boiler kettling, this happens in hard water areas where limescale builds in in the boiler's heat exchanging and constricts/blocks the flow of water. As the pressure builds up the water turns in to steam, when these steam bubbles collapse and turn back into water you get a rumbling/banging sound - to fix this you need to call out a heating engineer.

2. Air bubbles trapped in the water of your heating system expanding and collapsing can cause clicking noise. The best way to solve this is to use a radiator bleed key to release the air from the system. Turn your heating off, wait 10 minutes or so for the bubble to collect at the top of the radiators and then let it out with the key. You may have to do this a few time over the course of a few hours to get all the air out.

Method 1 Bleeding a Radiator in Your Home

  1. Diagnose your radiator. ...

  2. Find a radiator key. ...

  3. Turn off your heat. ...

  4. Open your radiator's valves. ...

  5. Catch drips from the valve. ...

  6. Wait for water to squirt out of the bleed valve. ...

  7. Repeat this process on all the radiators in your house. ...

  8. Check your boiler's pressure level.​

Reason 12 : Boiler Circulation Pump Is Not Running

If the pump is not running at all, this implies that the hot water is not entering the pump system, or heat is traveling there very slowly. Your pump may be very quiet, but if no water is being moved through the system, this implies that there is no power in the pump. Valves or other parts inside could be damaged, in which case you should turn off the pump, and have it replaced by an experienced plumber. The pump may also be too small to push against the water pressure. In order to fix the latter, you will need to increase the amount of cold water pressure or purchase a larger pump.

Reason 13 : Pump Is Leaking

Pumps often develop leaks at joins or flanges points. This is due to the pressure of the water penetrating the weakest parts of the pump, and also the weight of the pump itself affecting joins and causing holes through which the water can penetrate. Leaks can cause loss of water pressure, and may affect heating in parts of the house. This problem is not difficult to spot on the pump itself, as there will often be staining along the outside of the pump, and pools of water on the floor below. Caulking around the joins and flanges may help to solve the problem in the short term.

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