47
Alpha InTec² 25XE and 28XE - Error Codes and Fault Finding
Error
code
Fault Fault description Possible causes
Not used on this model
Insufficient supply voltage to operate boiler
Flame detected but signal lost. Ignition retries
after fan purge
Repeated loss of flame signal during operation
This fault can occur if the flue is exposed to high
wind conditions (shown as E38 in the fault code
history in the INFO menu)
The boiler has attempted to fire repeatedly for the
maximum time limit
No continuity on external sensor circuit
Check link is present in external connections
14 and 15 or if fitted external safety device has
activated
Flue thermostat has sensed high flue gas
temperature (110°C) and reduced the burner
output to prevent damage. If the temperature
continues to rise the boiler will lock out and E03
will be displayed
Error between communication of the Climatic
transmitter and boiler receiver
The PCB detects an incorrect mains supply
voltage frequency
The pump is stuck or there is an electrical pump
fault
Restricted CH flow due to air or a circuit restriction
This may occur when the PCB is replaced or if
the parameters are altered in the air/gas section
The PCB detects that some parameters have
been altered
The board detects an anomaly in the temperature
readings difference between the flow NTC and
safety NTC sensors
The PCB detects an anomaly on the safety NTC
sensor
An anomaly on the gas valve control is detected
BUS connection fault
Low supply voltage
Loss of flame
rectification
Loss of flame
rectification
Safety lock out
Low supply voltage
Optional external
safety sensor
intervention
Reduced burner
output
Climatic RF
communication fault
Mains supply voltage
frequency block
Pump fault
Air in the pump
Full boiler calibration
required
Fast calibration
required
High flow NTC and
safety NTC difference
detected
Safety flow sensor
anomaly
Anomaly on the gas
valve control
36
37
38
43
44
46
47
51
59
60
61
62
72
73
74
77
78
79
Check mains power supply
Check for bad cable connections etc
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
Check as above for error code 38
Check external control (room thermostat)
requests
Rapid on/off tap requests
Check external sensor and cable are not
damaged or wet
Check continuity of external sensor and circuit
Check connections 14 and 15 on connection
panel
Air in heat exchanger
Restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Pump fault
Batteries require replacing
Check mains power supply
Faulty PCB
Check the pump operation, it may be necessary
to free the pump shaft (refer to Section 2.4)
Check the pump wiring
Replace the pump
Check Flow and Return valves are open
Check for correct system pressure
Check the system is purged properly
Carry out full calibration process as described in
Section 5.13
Carry out fast calibration process as described
in Section 5.13
Faulty flow or safety NTC sensor
Check resistance reading on the sensors
Poor system circulation or blockage
Faulty safety NTC sensor
Check resistance reading on sensor
Replace the safety NTC sensor
Check the electrode condition, replace if
necessary
Check the inlet gas pressure is correct and
carry out a full calibration process as described
in Section 5.13
If the fault persists replace gas valve
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