42
Alpha E-Tec 25R - Error Codes and Fault Finding
Error
code
Fault
Fault description
Possible causes
Rapid temperature rise of primary sensor
Flue sensor resistance out of range
Loss of connection between the boiler and Alpha
Climatic control unit
Insufficient supply voltage to operate boiler
Flame detected but signal is lost
Ignition reattempts after fan purge
Repeated loss of flame signal during operation
(shown as E38 in the fault code history in the
INFO menu)
The boiler has attempted to fire repeatedly for the
maximum time limit
The boiler detects an unexpected increase in
)
T
between the system flow and return sensors
Boiler output is limited for boiler protection and
once the right
)
T is restored, the boiler resumes
regular operation
No continuity of optional thermostat circuit
Flue thermostat has sensed high flue gas
temperature (105°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
Return sensor has detected a high temperature
(90°) on the heat exchanger return circuit
Error between the communication of the Climatic
transmitter and boiler receiver
Possible wiring fault, sensors incorrectly fitted,
system blocked
From ignition the boiler detects no temperature
rise in the primary circuit
Blocked or restricted primary flow
Air in heat exchanger
Boiler or heating circuit valve closed
Pump fault
Primary flow sensor fault
Check sensor wiring connection
Flue sensor faulty
Remote control or receiver connection wiring
fault
Remote control or receiver fault
Check mains power supply, poor connection or
power supply interrupted
Check gas supply/working pressure
Check flame sensing electrode and lead
Check spark generator and lead
Check for flue gas recirculation
Check/adjust the gas valve settings
Check/adjust the fan speed settings
Check gas supply/working pressure
Check flame sensing electrode and lead
Check spark generator and lead
Check for flue gas recirculation
Check/adjust the gas valve settings
Check/adjust the fan speed settings
Check external control (room thermostat)
requests
Check DHW request signal (if applicable)
Check for blockages or restrictions
Make sure there is water circulating in the
boiler, that the pump is configured according to
the system requirements and the sensors are
fitted and reading correctly
Check optional thermostat and cable are not
damaged or wet
Check continuity of optional thermostat and
circuit
Check connection at X19 on PCB
Air in heat exchanger
Restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Pump fault
Blocked or restricted primary flow
Check the diverter valve operates properly (if
fitted)
Batteries require replacing
Distance between boiler and Climatic control
too great
Interference
Object blocking signal (metallic)
Check sensor wiring and connections
Check sensor resistance
Check circulation
Check system filling and venting
Check for air locks preventing flow
Check for blocked flow or closed valves
Insufficient primary
flow
Flue sensor fault
Loss of communication
with external control
(Alpha Climatic)
Low supply voltage
Loss of flame
rectification
Loss of flame
rectification
Safety lock out
High
)
T(temperature
difference)
Optional thermostat
intervention
Reduced burner output
Return sensor
high temperature
intervention
Climatic RF
communication fault
Return/flow sensor
error (return reading
higher than flow)
No primary
temperature increase
detected
27
29
31
37
38
43
44
45
46
47
49
51
70
71
