February 18, 2021
Some of the most common Alpha boiler error codes and what they mean
Alpha boiler error codes can be a nuisance, but it is often relatively easy to fix your alpha boiler once you check the fault code being displayed on the control panel electrode.
From water pressure problems to a sensor fault, issues with flow sensor, flue sensor, or even heat exchanger, we will run you through some common boiler fault types, how to check them and fix them.
Read on below to find out everything about boiler error codes and how to check them in alpha boilers.
Alpha boilers display an error code to check through flashing red and yellow lights on the control electrode display.
Different lights will light up flashing, depending on the problem.
If the A indicator light is lit up a solid red rather than flashing red, that is a 47 fault code: the flame burner has failed to light, so you have no heat supply to the boiler.
This is an easy fault to repair.
You just need to reset your boiler by rotating the front selector switch to the reset position. Leave it for 25 to 30 seconds, and your boiler will restart the flame.
If that doesn't help, there is a blockage somewhere, such as in your gas valve.
Call in a gas safe engineer to check and fully clean the burner air flue on your boiler to deal with any blocked parts.
When the red A indicator and the yellow B indicator are flashing, that means that your burner has failed to light its flame for a different reason.
Just like the first flame problem on the list, you can check this and return the control dial to position 3 for a flame reset.
It is more likely that your burner air system pump is blocked or has a fan fault, or the burner component itself is faulty, with a non-functional gas valve closed.
It could also be an issue with the ignition electrode connections, electrical supply circuit connections, or air pump expansion vessel circuit.
In this situation, you should get an engineer to check for a blocked or faulty burner element air fan fault and gas valve fault.
If the red A indicator light is flashing red on and off, but the yellow B indicator light is switched off, then your boiler fault is in the overheat thermostat electrode component. Check your control panel for error code 2 or code 25 return.
Unfortunately, this fault code is one that you will need to call a boiler engineer in to help repair the fault.
There are several different things that can go wrong with your thermostat, including closed-circuit valve connections for the heating system primary flow, pump fault, a problem with the flue sensor connections, your flue outlet being blocked or restricted, a primary flow blockage in flow and return circuit, flue gas recirculation, or even an airlock in the heat exchanger component.
Get an engineer to check the systems for a fault with the primary flow and return, a blocked or restricted gas supply, or a pump fault.
There are many reasons why you might not have any hot water, and most of these are easy to diagnose.
If the power light is not on, then there is no power supply to your boiler. If the fan starts running before the boiler starts trying to ignite, something has gone wrong with the ignition.
If the boiler won't fire up, the problem is in the pilot light, gas supply, or gas valve. If it fires up but then cuts out, then it is probably a gas valve supply issue. Otherwise, you probably have an issue with your diverter valve or flow sensor.
Sometimes, you can release a stuck diverter valve. In most cases, you will need to replace your flow sensor or diverter valve.
If you have got low boiler pressure, then your boiler probably shows an E10 fault code. It will also show low pressure on the gauge if you check that.
That means that you have lost too much pressure. This indicates that there is a heating system leak somewhere in your home heating system. You can deal with this, but it will take a bit of work.
You will need to check the pressure leak and fix it quickly before it risks damaging your house.
There are two common reasons for your hot water only getting to a warm temperature rather than hot temperature: thermistor sensor fault and limescale build-up.
The thermistor, or thermocouple, on your boiler, monitors the heat exchanger temperature sensor. Faulty sensors are an issue; the temperature sensor tells the boiler to stop heating at that temperature.
If there is a flue sensor fault or connection fault, or even a button fault, then your boiler might not reach the right temperature due to primary flow sensor faulty issues.
Engineers will be able to help you fix the issue. If it is not the thermistor flow sensor fault, then it is probably limescale in your pipes, which will need replacing as soon as possible.
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