Alpha Boiler Error Codes

Alpha Boiler Error Codes

Alpha Error Codes

The Alpha range of powerful boilers are normally extremely reliable.

Occasionally some things can go wrong, that’s why we’ve created our handy at-a-glance table of Alpha error codes below.

Should you need professional help with your broken boiler, then simply use one of our enquiry forms and we will connect you with the best heating engineers local to you.


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All Alpha Boilers Error Codes

E-Tec, E-Tec Plus, Evoke Combi Boilers Error Codes

Protec Plus System Error Codes

Flashing Light Error Codes

Alpha Boiler Fault Codes

Listed below are the error codes that you may see on an Alpha boiler.

Fault Code Model Affected Fault Possible Cause
1 All Ignition failure Gas supply Check pressure tubes Ignition electrode gap Flame sensor electrode gap Ignition generator or lead Flame sensor electrode lead Gas valve setting Gas valve PCB
2 All Overheat boiler lock out Pump or flow problem Blocked heat exchanger Air in heat exchanger Overheat thermostat Thermal fuse (if open circuit then replace primary heat exchanger)
3 All High flue thermostat temperature Blocked or restricted primary flow Heat exchanger air flow blocked Flue restriction Flue sensor fault
4 All Gas valve electrical connection fault Gas valve lead connection fault Faulty gas valve Faulty PCB
5 All Heating flow sensor fault Flow sensor wire connections Flow sensor faulty
6 All DHW sensor fault DHW sensor wiring connection DHW sensor faulty
8 All Maximum number of resets Refer to fault history codes (INFO menu d9)
10 All Primary system pressure low Check expansion vessel pressure (1 bar) Leak in system Expansion relief valve operated Primary pressure switch
12 All “Cylinder sensor fault (FlowSmart only)” “Cylinder sensor wiring connections Cylinder sensor faulty”
15 All Internal wiring error Check internal wiring connections to PCB Combination boiler DHW sensor X4 System boiler link X14 Refer to wiring diagram
16 All Fan fault Check fan wiring connections Fan fault PCB fault
20 All Flame sensing fault Check flame sensing electrode and lead PCB fault
24 All Control panel button fault Check for jammed control panel buttons Check for jammed PCB buttons
25 All 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 All Insufficient primary flow Blocked or restricted primary flow Air in heat exchanger Boiler or heating circuit valve closed Pump fault Primary flow sensor fault
29 All Flue sensor fault Check sensor wiring connection Flue sensor faulty
31 All Loss of communication with external Control (Alpha Climatic) Remote control or receiver connection wiring Remote control or receiver
37 All Low supply voltage Check mains power supply
38 All Loss of flame rectification Check flame sensing electrode and lead Check for flue gas recirculation Check/adjust the gas valve settings Check/adjust the fan speed settings
43 All Loss of flame rectification “Check gas supply/working pressure Check flame sensing electrode and lead Check for flue gas recirculation Check/adjust the gas valve settings Check/adjust the fan speed settings”
44 All Safety lock out Check external control (room thermostat) requests Rapid on/off hot tap requests
46 All External sensor intervention Check external sensor and cable are not damaged or wet Check continuity of external sensor and circuit Check connection at X19 on PCB and sensor connecting block
47 All Reduced burner output Air in heat exchanger Restricted primary flow Heat exchanger air flow blocked Flue restriction Flue sensor fault Pump fault
51 All Climatic RF communication fault Batteries require replacing Distance between boiler and climatic control too great Interference Object blocking signal (metallic)
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E-Tec, E-Tec Plus, Evoke Combi Boilers Error Codes

Fault Code Fault Possible Cause
60 Pump Error (stuck or there is an electrical pump fault) Pump operation (may need to free the pump shaft).
Pump Wiring.
Pump replacement needed.
61 Air in the pump (restricted CH flow) Flow and Return valves may not be open.
Incorrect system pressure.
System not purged properly.
Flow return valves are open.
70 Return/flow sensor
Exchange from possible wiring faul
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.
    Issues with sensor resistance.
SR Service Reminder Service reminder countdown has reached 0 (this will not stop boiler from working)
Boiler needs servicing.
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Protec Plus Error Codes

Listed below are the error codes that you may see on an Alpha boiler.

Fault Code Fault Possible Cause
0A1 Ignition failure Issue with gas supply.
Ignition electrode position and spark issues.
0A2 Flame detection fault Flame sensing electrode connections.
A short circuit to the electrode or wires.
0A3 Overheat thermostat lock-out Flame sensing electrode connections.
A short circuit to the electrode or wires.
0A5 Fan speed fault Problem with flue /ventilation.
Issue with air inlet manifold and pipe.
Damage or fault with fan.
Fan wire connections.
0A7 High flue temperature fault Air in the primary heat exchanger.
System restrictions causing overheating.
Flue run may have restrictions or blockages.
0A8 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.
0A15 Flow 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.
0A16 Flow 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.
0A17 Return 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.
0A18 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.
0A21 Main PCB fault Electrical connections.
Water ingress in connections.
0A30 Flow sensor short circuit Flow sensor connections and wires need checking.
Water ingress in connections.
0A31 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.
0A37 – Pro tec 70, 90, 115 Insufficient system pressure (if the system pressure is too low the boiler switches off.) System pressure needs to be 1 – 2 bar if its not the pressure needs refilling to the correct amount
0A43 Return sensor short circuit Problem with return sensor connections and wires.
Water ingress in connections
0A44 Return sensor out of range.
Sensor measures a temperature outside normal working range
Return sensor connections and damaged wires.
Return sensor resistance values need checking.
0A80 Flow and return sensor connection fault (may occur after several minutes of boiler operation.) Wires are not connected to the correct sensors.
0E2 Flame sensing fault. Flame sensing electrode connections need checking.
Short circuit to the electrode or wire.
0E13 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
0E25 Main PCB fault All electrical connections need to be checked.
Water ingress in connections.
0E34 DHW sensor out of range (measures a temperature outside normal working range.) DHW sensor connections and damaged cables.
Issues with DHW sensor resistance values
0E33 Low power supply voltage Electrical socket connection issues.
Problem with external power supply.
Possible power disruptions
0E37 Insufficient system pressure System needs checking for circulation and restrictions.
System pressure and gauge needs checking.
Pressure switch and connections need checking.
0E45 Flue sensor short circuit Flue sensor connections and wires need checking.
Water ingress in connections
0E46 Flue sensor out of range (measures a temperature outside of normal working range) Flue sensor connections, wires and flue sensor resistance values need checking.
0E81 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
0E98 Flow and return sensor anomaly detected (sensor shows incorrect temperature value) M to O Connections need checking
Compatible software on PCB needs checking
0E99 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.
FE95 External 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
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Alpha Flashing Light Errors Codes

Some Alpha boilers have lights as error codes. Listed below are some error codes that could appear on your boiler

Fault Code Model Affected Fault Possible Cause
No lights on Alpha C23, C27 CB, CB50, CD50, CDC, CDR, CDS, CDX, HE, HECB, HESY Electricity fault Check your electricity supply
Illuminated red A or B Alpha C23, C27 CB, CB50, CD50, CDC, CDR, CDS, CDX, HE, HECB, HESY 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 Alpha C23, C27 CB, CB50, CD50, CDC, CDR, CDS, CDX, HE, HECB, HESY Burner is alight No action required
Flashing red A or B Alpha C23, C27 CB, CB50, CD50, CDC, CDR, CDS, CDX, HE, HECB, HESY Overheat thermostat has operated / Temperature sensor fault Rotate selector switch to the reset position (3) to reset
Flashing yellow every five seconds or Illuminated Green D Alpha C23, C27 CB, CB50, CD50, CDC, CDR, CDS, CDX, HE, HECB, HESY Electrical supply to the boiler is on No Action Required
Flashing yellow B or flashing Red A Alpha C23, C27, CB, CB50, CD50, CDC, CDR, CDS, CDX, HE,HECB, HESY, Temperature sensor fault Contact a professional
Illuminated red A and flashing yellow B or Flashing red A and flashing red B Alpha C23, C27, CB, CB50, CD50, CDC, CDR, CDS, CDX, HE,HECB, HESY, Blocked flue or fan fault contact a professional
Flashing yellow or flashing Red A or Flashing (alternating) red A and flashing (alternating) yellow B Alpha C23, C27, CB, CB50, CD50, CDS, CDX, HE,HECB, HESY, System pressure is very low and re-pressurisation is required Contact a professional
Illuminated red A and flashing yellow B Alpha C27, CB, CB50, HE,HECB Pump fault or restricted flow Contact a professional
Flashing red A and Flashing red B and flashing yellow C Alpha CDR Temperature sensor wiring or flow and return connections incorrect Contact a professional
Flashing red A and flashing red B and flashing yellow C indicators Alpha CDS, CDX Flue temperature too high (air in the heat exchanger, heat exchanger blocked Contact a professional
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