Alpha Boiler Fault Codes / Error Codes List Re March 16, 2021

Alpha Boiler Fault Codes / Error Codes List

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Alpha boilers fit into the ‘budget boiler’ category of boilers. As such, they encounter issues more frequently than more expensive boiler brands such as Worcester and Vaillant. Having said that, Alpha boilers are currently rated 4.8 out of 5 on Trustpilot.

Even the most reliable of boilers can experience a fault and lockout, then start flashing lights at you or displaying incomprehensible error codes; but don’t worry, you’ve come to the right place. We will guide you to the error code you are encountering with your Alpha boiler and tell you what the fault code relates to.

It’s illegal for you to remove the cover on your Alpha boiler and attempt to fix an issue yourself. You should always contact a Gas Safe Engineer for any issue relating to your boiler or heating system. The purpose of this guide is to help you diagnose the issue so you can get an idea of the cost to fix your Alpha boiler or replace it if fixing it isn’t cost-effective.

If your boiler is in warranty, then contact Alpha and they should come out to fix it as long as you have met the conditions of your warranty (getting an annual boiler service, etc).

If your boiler is out of warranty and rather than put money into fixing it you think it might be worth getting a quote on a new boiler, then give WarmZilla a try. Prices start from £1489 including installation, wireless controls, system cleanse, system filter, and a guarantee lasting between 5 & 10 years depending on which boiler model you select.

WarmZilla offers boiler finance starting from as little as £9.80 per month, with 0% interest over 2 years on selected boilers. Our lenders have a very high acceptance rate, even if you have a bad credit history.

Hopefully, it won’t cost much to get your Alpha boiler fixed but if it’s £400 and you’ve had it a good few years then it may be worthwhile getting a WarmZilla boiler quote.

Below we have listed general Alpha boiler/fault codes for issues that apply to all Alpha boilers, fault codes that only apply to specific boiler models, and also flashing light error codes.

Just click on your boiler model or the particular issue you are encountering with your Alpha boiler below and you will be taken to a list of all the fault codes related to that issue.

General Alpha Boiler Error/Fault Codes

Below is a table containing common Alpha boiler fault codes that apply to a range of Alpha boilers.

Fault CodeFaultFault Description
1

Ignition failure

Gas supply, pressure tubes, ignition electrode, flame sensor electrode, ignition generator, lead flame sensor, electrode lead, gas valve setting, gas valve printed circuit board (PCB)

2

Overheat boiler lockout

Pump or flow problem, blocked heat exchanger, air in heat exchanger, overheat thermostat, thermal fuse (if open circuit then replace primary heat exchanger)

3

High flue thermostat temperature

Blocked or restricted primary flow, heat exchanger air flow blocked, flue restriction, flue sensor fault

4

Gas valve electrical connection fault

Gas valve lead connection fault, faulty gas valve or faulty printed circuit board (PCB)

5

Heating flow sensor fault

Flow sensor wire connections, flow sensor faulty

6

Domestic how water (DHW) sensor fault

DHW sensor wiring connection or DHW sensor faulty

8

Maximum number of resets

Refer to fault history codes

10

Primary system pressure low

Check expansion vessel pressure (1 bar), leak in system, expansion relief valve operated or primary pressure switch

12

Cylinder sensor fault (FlowSmart only)

Cylinder sensor wiring connections or cylinder sensor faulty

15

Internal wiring error

Check internal wiring connections to printed circuit board (PCB), Combi boiler domestic hot water (DHW) sensor X4, System boiler link X14

16

Fan fault

Fan wiring connections, fan fault or printed circuit board (PCB) fault

20

Flame sensing fault

Check flame sensing electrode and lead printed circuit board (PCB) fault

24

Control panel button fault

Jammed control panel or printed circuit board (PCB) buttons

25

Overheat lock out

Air in heat exchanger, blocked or restricted primary flow, heat exchanger air flow blocked, flue restriction, flue sensor fault, pump fault, boiler or heating circuit valve closed

27

Insufficient primary flow

Blocked or restricted primary flow, air in heat exchanger, boiler or heating circuit valve closed, pump fault or primary flow sensor fault

29

Flue sensor fault

Sensor wiring connection or flue sensor faulty

31

Loss of communication with external control (Alpha Climatic)

Remote control or receiver connection wiring

37

Low supply voltage

Check mains power supply

38

Loss of flame rectification

Flame sensing electrode and lead, check flue gas recirculation, check the gas valve settings and check the fan speed settings

43

Loss of flame rectification

Check gas supply working, check flame sensing electrode and lead, check for flue gas recirculation, check the gas valve settings, check the fan speed settings

44

Safety lock out

Check external control (room thermostat) requests and rapid on/off hot tap requests

46

External sensor intervention

External sensor and cable damaged or wet, continuity of external sensor and circuit, check connection at X19 on printed circuit board (PCB) and sensor connecting block

47

Reduced burner output

Air in heat exchanger, restricted primary flow, heat exchanger airflow blocked, flue restriction, flue sensor fault or pump fault

51

Climatic RF communication fault

Batteries need replacing, distance between boiler and climatic control too great, interference object blocking signal (metallic)

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

Error codes relating specifically to the Alpha E-Tec, E-tec Plus & Evoke combi boiler models.

Fault CodeFaultFault Description
60

Pump error (stuck or there is an electrical pump fault)

Pump operation (may need to free the pump shaft), issue with pump wiring or pump replacement needed.

61

Air in the pump (restricted central heating flow)

Flow and Return valves may not be open, iIncorrect system pressure, system not purged properly or flow return valves are open.

70Return/flow sensor
Exchange from possible wiring fault
Issues with sensor wiring and connections.
Issues with sensor resistance.
75/76

Return/flow sensor fault from possible failure of one or both sensors

Issues with sensor resistance.

SR

Service reminder

Service reminder countdown has reached 0 (this will not stop boiler from working) – boiler needs servicing.

Alpha Protec Plus System Error Codes

Error codes relating to the Alpha Protec Plus System boiler.

Fault CodeFaultFault Description
OA1

Ignition failure

Issue with gas supply.
Ignition electrode position and spark issues.
OA2

Flame detection fault

Flame sensing electrode connections.
A short circuit to the electrode or wires.
OA3

Overheat thermostat lock-out

Flame sensing electrode connections.
A short circuit to the electrode or wires.
OA5

Fan speed fault

Problem with flue /ventilation.
Issue with air inlet manifold and pipe.
Damage or fault with fan.
Fan wire connections.
OA7

High flue temperature fault

Air in the primary heat exchanger.
System restrictions causing overheating.
Flue run may have restrictions or blockages.
OA8

Flame circuit fault

Incorrect gas supply.
Ignition electrode position and spark.
Issues with flame sensing electrode gap and connections.
0A9

Gas valve electrical error

Valve connection issues.
Main PCB.
Gas valve operation issues.
Gas contamination.
OA15Flow and return sensor anomaly detected.
(incorrect temperature value shown on sensor.)
Poor or incorrect circulation.
External circuit influences.
Problem with resistances of flow and return sensors.
OA16Flow sensor temperature rise incorrect (time taken for flow temperature to rise is too long.System circulation issues.
System volume or flow is too high.
Boiler output is insufficient for the system.
OA17Return sensor temperature rise incorrect (time taken for flow temperature to rise is too long.System circulation issues.
System volume or flow is too high.
Boiler output is insufficient for the system.
OA18

Flow and return sensor anomaly detected. Sudden temperature change detected on the flow or return sensor.

System circulation issues.
Problem with operation of zone valves.
Resistances and function of flow and return sensors needs checking.
OA21

Main PCB fault

Electrical connections.
Water ingress in connections.
OA30

Flow sensor short circuit

Flow sensor connections and wires need checking.
Water ingress in connections.
OA31

Flow sensor out of range. (sensor measures a temperature not in normal range.)

Problem with flow sensor connections and damaged wires.
Sensor resistance values wrong.

0A37 – Pro Tec 50

Insufficient system flow (if the system flow is too low for a certain length of time boiler will switch off)

Flow switch reading needs checking.
Restrictions or shut valves in system.
Pump function issues.
System pressure issues.
OA43

Return sensor short circuit

Problem with return sensor connections and wires.
Water ingress in connections
OA44Return sensor out of range.
Sensor measures a temperature outside normal working range
Return sensor connections and damaged wires.
Return sensor resistance values need checking.
OA80

Flow and return sensor connection fault (may occur after several minutes of boiler operation.)

Wires are not connected to the correct sensors.

OE2

Flame sensing fault.

Flame sensing electrode connections need checking.
Short circuit to the electrode or wire.
OE13

Maximum number of resets reached. (Over 5 reset attempts have been reached within 15 minutes.)

Investigate initial fault code displayed.
Power supply needs to be turned Off/On to clear this code
OE25

Main PCB fault

All electrical connections need to be checked.
Water ingress in connections.
OE33

Low power supply voltage

Electrical socket connection issues.
Problem with external power supply.
Possible power disruptions
OE34

DHW sensor out of range (measures a temperature outside normal working range.)

DHW sensor connections and damaged cables.
Issues with DHW sensor resistance values
OE37

Insufficient system pressure

System needs checking for circulation and restrictions.
System pressure and gauge needs checking.
Pressure switch and connections need checking.
OE45

Flue sensor short circuit

Flue sensor connections and wires need checking.
Water ingress in connections
OE46

Flue sensor out of range (measures a temperature outside of normal working range)

Flue sensor connections, wires and flue sensor resistance values need checking.

OE81

Flow and return sensor anomaly detected (the sensor shows an incorrect temperature value)

Poor or incorrect circulation / external circuit influences resistance of flow return sensors need checking

OE98

Flow and return sensor anomaly detected (sensor shows incorrect temperature value)

M to O Connections need checking
Compatible software on PCB needs checking
OE99

Simple cascade communication error

Wiring connections needs checking on all boilers.
Configuration, parameter 38.
FE94

Display PCB fault.

Electrical connections to display board need checking.
Water ingress in connections.
Damage to buttons or LCD screen.
FE95External flow sensor out of range or short circuit/
External flow sensor measures a temperature outside of normal working
range.
External flow sensor connections and wires need checking for damage. External flow sensor resistance values need checking to make sure they are between 5 and 0
FE96

External sensor fault

External sensor connections and wires need checking.
Water ingress in connections.
Boiler parameter settings are incorrect.
FE97

Boiler PCB configuration error (may occur if the main PCB or display PCB is changed.)

All electrical connections.
Incorrect parameter settings on PCB.
Press ‘-‘ CH button until ‘AUTO’ appears, then press and
hold ‘RESET’ button until ‘bu1’ appears

 

Alpha Flashing Light Error Codes

All Alpha boiler errors communicated by flashing lights.

Light SequenceFaultFault Description

No lights on

Electricity fault

Check your electricity supply

Illuminated red A or B

Burner has failed to light

Rotate selector switch to the reset position (3) and the ignition sequence will restart after a delay of about 30 seconds

Illuminated yellow B or C

Burner is alight

No action required

Flashing yellow every 5 seconds or illuminated green D

Electrical supply to the boiler is on

No action required

Flashing yellow B or flashing Red A

Temperature sensor fault

Contact a Gas Safe engineer

Illuminated red A and flashing yellow B or Flashing red A and flashing red B

Blocked flue or fan fault

Contact a Gas Safe engineer

Flashing yellow or flashing Red A or Flashing (alternating) red A and flashing (alternating) yellow B

System pressure is very low and re-pressurisation is required

Contact a Gas Safe engineer

Illuminated red A and flashing yellow B

Pump fault or restricted flow

Contact a Gas Safe engineer

Flashing red A and Flashing red B and flashing yellow C

Temperature sensor wiring or flow and return connections incorrect

Contact a Gas Safe engineer

Flashing red A and flashing red B and flashing yellow C indicators

Flue temperature too high (air in the heat exchanger, heat exchanger blocked

Contact a Gas Safe engineer
alpha-boiler

Alpha E-TEC Regular Gas Boiler Error Codes

All Alpha E-Tec Regular boiler codes are located in the table below.

Fault CodeFaultFault Description
1

Ignition failure

Check the gas supply, pressure tubes, ignition electrode, flame sensor electrode, ignition generator or lead flame sensor, gas valve setting and PCB.

2

Overheat boiler lockout

Pump or flow problem. Caused by a blocked heat exchanger, air in heat exchanger, overheated thermostat, thermal fuse (if open circuit then replace primary heat exchanger).

3

High flue thermostat temperature

Blocked or restricted primary flow. Heat exchanger air flow blocked, flue restriction, flue sensor fault.

4

Gas valve electrical connection fault

Gas valve lead connection fault. Faulty gas valve or faulty PCB.

5

Heating flow sensor fault

Flow sensor wire connections. Flow sensor faulty.

6

Internal wiring error

Incorrect wiring configuration detected. Internal wiring connections to PCB need checking.

7

Chimney sweep function is active

Chimney sweep function is active. E07 is displayed on the climatic remote control.

8

Maximum number of resets

Refer to fault history codes

12

Cylinder sensor fault (FlowSmart only)

Cylinder sensor wiring connection – cylinder sensor faulty.

16

Fan fault

Check fan wiring connection, fan fault or PCB fault.

20

Flame sensing fault

Check flame sensing electrode and lead PCB for faults.

23

Heating return sensor fault

Incorrect return sensor resistance value – return sensor wire connections or sensor could be faulty.

24

Control panel button fault

Control panel button is stuck in the ‘on’ position – check for jammed control panel buttons or jammed PCB button.

27

Insufficient primary flow

Blocked or restricted primary flow. Air in heat exchanger, boiler or heating circuit valve closed, pump fault or primary flow sensor fault.

29

Flue sensor fault

Check sensor wiring connection – flue sensor faulty.

31

Loss of communication with external control (Alpha Climatic)

Remote control or receiver connection wiring.

37

Low supply voltage

Check mains power supply.

38

Loss of flame rectification

Check flame sensing electrode and lead and for flue gas recirculation. Check or adjust the gas valve settings. Check or adjust the fan speed settings.

43

Loss of flame rectification

Check gas supply/working pressure, flame sensing electrode and lead, check for flue gas recirculation, check/adjust the gas valve settings, check/adjust the fan speed settings.

44

Safety lockout

Check external control (room thermostat) requests. Rapid on/off hot tap requests.

45

High-temperature difference

The boiler is detecting an unexpected increase between the system flow and return sensors. Boiler output is limited for boiler protection and once restored the boiler resumes regular operation.

46

Optional thermostat intervention

No continuity of optional thermostat circuit – check the optional thermostat and cable are not damaged or wet.

47

Reduced burner output

Flue thermostat has sensed high flue gas temperature and reduced the burner output to prevent damage. If the temperature continues to rise the boiler will lockout and the E03 error code will be displayed. This could be due to air in the heat exchanger, restricted primary flow or heat exchanger air blocked.

49

Return sensor high temperature intervention

Return sensor has detected a high temperature on the exchanger return circuit.

51

Climatic RF communication fault

The error between the communication of the climatic transmitter and boiler receiver. Could mean the batteries need replacing or the distance between the boiler and climatic control is too great or a metal object is blocking the signal.

70

Return flow sensor error

Possible wiring faults sensor is incorrectly fitted or the system is blocked – check the sensor wiring and connections, also check sensor resistance and circulation.

71

No primary temperature increase detected

From ignition the boiler detects no temperature rise in the primary circuit – check system filling and venting, airlocks preventing flow check, blocked flow, or closed valves.

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