Benchmark Alpha E-Tec Plus 28 Installation And Servicing Instruction page 50

Error Fault
code
25 PCB fault
27 Primary circuit
overheat
29 Flue sensor fault
31 Loss of
communication with
external control (Alpha
Climatic)
37 Low supply voltage
38 Loss of flame
rectification
43
Loss of flame
rectification
45
High )T
47
Reduced burner
output
51
Climatic RF
communication fault
60
Pump fault
61
Air in the pump
70
Return/flow sensor
error (return reading
higher than flow)
75
Return/flow sensor
fault
76
Return/flow sensor
fault
50
Alpha E-Tec Plus 28, 33 and 38 - Error Codes and Fault Finding
Fault description
PCB fault - software error
Insufficient circulation in primary circuit causing
overheating
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 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 detects a sudden, unexpected increase
in )T between the flow sensor and the system
return sensor
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 pump is stuck or there is an electrical pump
fault
Restricted CH flow due to air or a circuit restriction
Possible wiring fault, sensors incorrectly fitted,
system blocked
Possible failure of one or both sensors
Possible failure of one or both sensors
Possible causes
Replace PCB
Air in heat exchanger
Isolation/system valves closed
Check wiring/power to pump
Pump seized/blocked
Pump failed
Check sensor wiring and connections
Check sensor resistance
Remote control or receiver connection wiring
Distance or interference of RF signal
Remote control or receiver fault
(Check batteries if using RF controller)
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 burner earth connection
Check as above for error code 38
Burner input is limited for boiler protection,
and once the right )T is restored, the boiler
resumes regular operation. Make sure there
is water circulating in the boiler, that the
pump is configured according to the system
requirements and that the return sensor is
correct.
Air in heat exchanger
Restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Pump fault
Batteries require replacing
Check the pump operation, it may be necessary
to free the pump shaft
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
Check sensor wiring and connections
Check sensor resistance
Check circulation
Check sensor wiring and connections
Check sensor resistance
Check sensor wiring and connections
Check sensor resistance