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Repair Advice for Common Alpha Boiler Problems

As a homeowner it's important to be aware of the potential issues that can arise with your appliances, including your boiler. Alpha boilers are generally reliable but they can still experience problems. In this article we'll go over some of the most common problems that Alpha models encounter and provide tips on how to fix them. Whether you're comfortable with DIY repairs or you prefer to hire a professional this information will be useful in addressing any issues that come up with your boiler.

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Solid Red Light (A Indicator)

If your Alpha boiler is displaying a solid red light on the A indicator it means that there is an issue with the ignition process. This could be caused by a faulty ignition electrode or a problem with the gas valve. Here's how to troubleshoot and fix this problem:

  1. First check the ignition electrode and make sure it is properly positioned and not covered in dirt or debris. If it is dirty, clean it off with a dry cloth. If it is damaged or not properly aligned it will need to be replaced.
  2. If the ignition electrode looks fine the next step is to check the gas valve. Make sure it is fully open and not blocked by any debris. If it is partially closed or blocked this could be causing the ignition process to fail.
  3. If the gas valve is fine and the ignition electrode has been replaced but the A indicator is still displaying a solid red light there may be a problem with the control board. In this case it will likely be necessary to call a professional for repairs.

Noise Coming From Pipes

If you notice that your Alpha boiler is making unusual noises such as banging or whistling it could be a sign of a problem with your pipes. This is often caused by air in the pipes or water moving through them at an irregular rate. In some cases, the problem may be more serious and require the attention of a professional. However, there are a few steps you can try to troubleshoot and fix the issue on your own:

  1. Bleed the radiators to remove any air that may be trapped in the system. This can help to balance the water flow and reduce noise.
  2. Check the expansion tank to make sure it is properly pressurised. An expansion tank that is either over or under pressurized can cause noisy pipes.
  3. Inspect the pipes for any visible damage or loose fittings. Tightening or replacing damaged components can help to reduce noise.

If these steps do not resolve the issue it may be necessary to call a professional to diagnose and fix the problem. Continuing to ignore noisy pipes can lead to more serious issues such as damaged pipes or reduced efficiency of your boiler.

Low Boiler Pressure (Error Code E10)

Low boiler pressure is a common issue that can affect Alpha boilers. It is typically indicated by error code E10 on the boiler's display and there are a few possible causes for low pressure including a leak in the system, a faulty pressure relief valve or a problem with the expansion vessel. Here's the approach you should take to rectify the issue:

  • Check the pressure gauge on the front of the boiler, should be between 1 and 1.5 bar. If it is below 1 bar you will need to re-pressurise the system.
  • Locate the filling loop which is a flexible hose that is usually located behind the boiler then use a radiator key to open the valve and allow water to flow into the system until the pressure is between 1 and 1.5 bar.
  • If the pressure continues to drop you may have a leak in the system so will need to check all of the radiators and pipes for signs of water leakage. If you find a leak you will need to repair it before the pressure can be properly maintained.
  • If you are unable to fix the problem or if the pressure continues to drop it is recommended to contact a professional heating engineer for further assistance.

No Hot Water (Error Code 37 or 16)

If your Alpha boiler is experiencing either Error 37 or Error 16 it means that there is a problem with the flow of hot water in your system. This could be caused by a variety of issues such as a faulty diverter valve or a blocked heat exchanger. Here are some steps you can take to troubleshoot and fix this problem:

  • Check the diverter valve and clean or replace it if necessary.
  • Flush the heat exchanger to remove any blockages.
  • Check the pump and circulate it manually to ensure it is functioning properly.
  • Check the pressure gauge and refill the system if the pressure is low.

If these steps do not resolve the issue it may be necessary to call a professional technician to diagnose and rectify the problem.

Blinking Red Light (A Indicator)

If the red light on your Alpha boiler is flashing it could indicate a problem with the appliance. This is known as the "A" indicator and it usually means that the boiler is experiencing a fault or error. The first step to take when you see the red light flashing is to check the user manual for your specific model. The manual should provide information on what the flashing light means and how to troubleshoot the problem.

If the manual does not provide a clear solution you can try resetting the boiler. To do this turn off the power supply to the boiler and wait a few minutes before turning it back on. If the red light continues to flash it may be necessary to call a professional engineer to diagnose and fix the issue.

Some common causes of the flashing red light include a faulty thermostat, low water pressure or a blocked flue. By identifying the root cause of the problem you can determine the appropriate course of action to take.

Tepid Water

If you've noticed that the water coming from your Alpha boiler is lukewarm there could be a few possible causes. Here are a few things to check:

  • Thermostat settings: Make sure that the thermostat is set to a high enough temperature to heat the water to your desired level. If the thermostat is set correctly and the water is still lukewarm, proceed to the next steps.
  • Scale build-up: Over time mineral deposits can build up in your boiler and reduce its efficiency. This can cause the water to be lukewarm. To fix this issue, you can try flushing the boiler to remove the scale build-up. Consult your owner's manual or a professional for guidance on how to do this safely.
  • Faulty heating element: If flushing the boiler doesn't improve the water temperature, the heating element may be faulty. You'll need to replace the element in order to fix the problem. Consult a professional for assistance with this repair.


Kettling is a common problem that can occur with Alpha boilers. It is characterized by loud rumbling or knocking noises coming from the boiler and it can be caused by a build-up of limescale in the heat exchanger. Kettling can reduce the efficiency of the boiler and potentially cause damage if left unaddressed.

Symptoms of kettling:

  • Loud rumbling or knocking noises coming from the boiler
  • Reduced heating performance
  • Higher energy bills

How to fix kettling:

  1. Shut off the power supply to the boiler and let it cool down.
  2. Bleed the radiators to remove any air that may be causing the kettling noise.
  3. Contact a professional to descale the heat exchanger and check for any other issues.
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