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Updated: September 25, 2024

Alpha boilers are known for their affordability, making them a popular choice for homeowners on a budget. However, due to their lower price point, they can experience more frequent breakdowns compared to premium models. Despite this, Alpha boilers maintain good customer ratings on most review platforms. This guide will help you understand common Alpha boiler fault codes and errors. In some cases, fixing the problem may not be cost-effective, and replacing the boiler might be a better option.

It is important to note that attempting to fix your Alpha boiler on your own is both illegal and dangerous. Only a certified gas-safe engineer is authorized to work on gas appliances. This guide is meant to provide diagnostic information to help you communicate effectively with professionals and understand potential repair costs.

General Alpha Boiler Error/Fault Codes

Below is a table of the most common fault codes encountered in Alpha boilers, along with descriptions of the issues they represent.

Common Fault Codes and Descriptions

Fault CodeFaultDescription
1Ignition failurePossible causes: issues with gas supply, pressure tubes, ignition electrode, flame sensor, gas valve, or PCB (Printed Circuit Board).
2Overheat boiler lockoutCaused by a blocked heat exchanger, air in the system, pump issues, or thermostat problems.
3High flue thermostat temperatureIndicates restricted primary flow, blocked heat exchanger, or flue issues.
4Gas valve electrical faultRelated to faulty wiring connections or gas valve.
5Heating flow sensor faultIssues with flow sensor wiring or sensor failure.
6Domestic hot water (DHW) sensor faultFaulty wiring or sensor malfunction in the DHW system.
8Maximum number of resetsIndicates repeated attempts to reset the boiler have failed. Review fault history for more information.
10Low primary system pressureOften due to leaks, faulty pressure relief valves, or insufficient expansion vessel pressure.
12Cylinder sensor fault (FlowSmart only)Indicates a fault in cylinder sensor wiring or sensor malfunction.
15Internal wiring errorInvolves issues with internal wiring connections to the PCB.
16Fan faultRelated to faulty fan or its wiring connections.
20Flame sensing faultFault in flame sensing electrode or related wiring.
24Control panel button faultUsually caused by jammed buttons on the control panel or PCB.
25Overheat lockoutCaused by air in the heat exchanger or restricted flow within the system.
27Insufficient primary flowPossible blockages in the system, air in the heat exchanger, or pump issues.
29Flue sensor faultIndicates faulty flue sensor or related wiring issues.
31Communication loss with external controlInvolves issues with remote control or receiver connection.
37Low supply voltageCheck the main power supply for irregularities.
38, 43Loss of flame rectificationPotential gas supply issues or problems with flame sensing components.
44Safety lockoutCaused by thermostat issues or hot tap requests being processed too quickly.
46External sensor interventionOften caused by external sensor damage or faulty connections.
47Reduced burner outputIndicates airflow restrictions, heat exchanger issues, or pump faults.
51Climatic RF communication faultRelated to communication issues between the boiler and the climatic control unit.

Alpha E-Tec, E-Tec Plus, Evoke Combi Boiler Error/Fault Codes

Specific Error Codes for E-Tec Models

Fault CodeFaultDescription
60Pump errorEither the pump is stuck or there is an electrical fault. The pump may need freeing, or replacement may be required.
61Air in pumpThis is due to restricted central heating flow, improper system pressure, or valves being closed.
70Return/flow sensor faultSensor wiring issues or faulty sensor resistance are likely causes.
75/76Return/flow sensor failureBoth sensors may need to be inspected for potential failures.
SRService reminderIndicates that the service countdown has reached 0, but the boiler will continue working.

Alpha E-TEC Regular Gas Boiler Error Codes

Common Fault Codes for Regular Gas Boilers

Fault CodeFaultDescription
1Ignition failurePossible issues include problems with the gas supply, ignition electrode, or flame sensor.
2Overheat boiler lockoutCaused by blocked heat exchangers, pump failures, or air trapped in the system.
3High flue thermostat temperatureIndicates restricted flow or blocked heat exchangers.
4Gas valve electrical connection faultFault in gas valve wiring or a faulty PCB.
5Heating flow sensor faultIssues with flow sensor wiring or malfunctioning sensor.
6Internal wiring errorIndicates incorrect wiring configurations or internal PCB faults.
7Chimney sweep function activeThe chimney sweep function is active and needs to be disabled.
16Fan faultIndicates a problem with fan wiring or fan malfunction.
27Insufficient primary flowBlocked flow, air in the heat exchanger, or pump faults are common causes.
44Safety lockoutTriggered by faulty thermostat requests or rapid on/off hot tap commands.

Alpha Protec Plus System Error Codes

Fault Codes Specific to Protec Plus Systems

Fault CodeFaultDescription
OA1Ignition failureCould be caused by gas supply issues or spark electrode faults.
OA2Flame detection faultIndicates issues with flame sensing electrode connections.
OA3Overheat thermostat lock-outMay be caused by faulty flame sensing electrode connections or wiring.
OA5Fan speed faultFlue/ventilation problems or fan wiring issues.
OA7High flue temperature faultCould be caused by air in the heat exchanger or system restrictions.
OA9Gas valve electrical errorIndicates a fault in valve connections or PCB.
OA15Flow and return sensor anomalyDetected abnormal temperature changes in the flow/return sensor.
OA30Flow sensor short circuitIndicates flow sensor wiring or connections need attention.
OA31Flow sensor out of rangeThe flow sensor is detecting a temperature outside the normal range.
0A37Insufficient system flowThe system flow is too low, likely due to restrictions or pump issues.
OA43Return sensor short circuitCaused by damaged return sensor wiring or connections.

Alpha Flashing Light Error Codes

Understanding Flashing Lights on Alpha Boilers

Alpha boilers use a flashing light sequence to indicate specific problems. Below are common flashing light sequences and their meanings:

Light SequenceFaultDescription
No lights onElectricity faultIndicates no power supply to the boiler.
Red A or BBurner has failed to igniteRotate selector switch to the reset position and try again.
Yellow B or CBurner is litNo action required.
Flashing yellow or green DElectrical supply is onNo action required.
Flashing red A or BTemperature sensor faultContact a Gas Safe engineer.
Red and yellow flashingPump fault or restricted flowA Gas Safe engineer should check the pump and system.


Final Thoughts: Boiler Maintenance and Warranty
Regular maintenance is crucial for the long-term reliability of your Alpha boiler. Make sure you schedule an annual service to maintain warranty conditions and prevent breakdowns. Should you encounter persistent issues, it may be worth considering a boiler replacement rather than repeated repairs.
By understanding these fault codes and troubleshooting steps, you’ll be better prepared to discuss the necessary repairs with a Gas Safe engineer. Always prioritize safety and never attempt repairs on your own.

FAQs

What does e01 mean on a Alpha boiler?

The Alpha boiler e01 error appears when there has been a problem with the ignition system. Generally, this means that there was no flame detected when your boiler tried to light the burner to then heat the water.

Why is my Alpha boiler flashing red?

Flashing red light (A indicator)
Seeing a flashing red light on the A indicator means that there’s an issue with the overheat thermostat. You might also see a 2, 25 or 0A3 error code. The overheat thermostat is a vital part of Alpha boilers as it monitors the temperature to prevent the unit from overheating

Different types of boilers:

Different boilers can be fitted differently. Combi Boiler, Conventional Boiler, Heating System Boiler, etc. are some of the main types and all have various installation specifications.