Alpha InTec 26C User Instructions page 6

Error Fault
code
20 Flame sensing fault
24 Control panel button
fault
25 Overheat lock out
27 Insufficient primary
flow
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
44 Safety lock out
46 External sensor
intervention
47 Reduced burner
output
51 Climatic RF
communication fault
6
Alpha InTec C, X and GS
Fault description
False flame detection
Flame detected but gas valve is not open
Control panel button stuck in the on position
Rapid temperature rise of flue sensor
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
No continuity of external sensor circuit
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 the communication of the
Climatic transmitter and boiler receiver
Possible causes
Check flame sensing electrode and lead
PCB fault
Check for jammed control panel buttons
Check for jammed PCB buttons
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
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
Remote control or receiver
Check mains power supply
Check flame sensing electrode 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 for flue gas recirculation
Check/adjust the gas valve settings
Check/adjust the fan speed settings
Check external control (room thermostat)
requests
Rapid on/off hot tap requests
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
Air in heat exchanger
Restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Pump fault
Batteries require replacing
Distance between boiler and climatic control
too great
Interference
Object blocking signal (metallic)