Alpha Boiler Error Codes

Alpha Boiler Error Codes

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
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
Check for bad cable connections etc
38 All
Flame detected but signal lost. Ignition retries after fan purge
Check flame sensing electrode and lead
Check for flue gas recirculation
Check the gas valve
Check flue system and termination
Check gas supply/working pressure
Check/adjust combustion 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)
59 All Mains supply voltage
frequency block
The PCB detects an incorrect mains supply
Voltage frequency – Check mains power supply
Faulty PCB
60 All Pump fault
The pump is stuck or there is an electrical pump fault:
Check the pump operation, it may be necessary to free the pump shaft
Check the pump wiring
Replace the pump
61 All Air in the pump Restricted CH flow due to air or a circuit restriction:
Check Flow and Return valves are open
Check for correct system pressure
Check the system is purged properly
62 All
Full boiler calibration
required
This may occur when the PCB is replaced or if the parameters are altered in the air/gas section:
Carry out full calibration process as described
72 All
Fast calibration
required
The PCB detects that some parameters have been altered
Carry out fast calibration process as described
73 All
High flow NTC and
safety NTC difference
detected
The board detects an anomaly in the temperature readings difference between the flow NTC and safety NTC sensors
Faulty flow or safety NTC sensor
Check resistance reading on the sensors
Poor system circulation or blockage
74 All
Safety flow sensor
anomaly
The PCB detects an anomaly on the safety NTC sensor:
Faulty safety NTC sensor
Check resistance reading on sensor
Replace the safety NTC sensor
77 All An anomaly on the gas valve control is detected An anomaly on the gas valve control is detected
Check the electrode condition, replace if necessary
Check the inlet gas pressure is correct and carry out a full calibration process as described. If the fault persists replace gas valve
78 All An anomaly on the gas valve control is detected An anomaly on the gas valve control is detected
Check the electrode condition, replace if necessary
Check the inlet gas pressure is correct and carry out a full calibration process as described. If the fault persists replace gas valve
79 All An anomaly on the gas valve control is detected An anomaly on the gas valve control is detected
Check the electrode condition, replace if necessary
Check the inlet gas pressure is correct and carry out a full calibration process as described. If the fault persists replace gas valve
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