Alpha E-Tec Plus 28NX - Page 62

Alpha E-Tec Plus 28NX, 33NX and 38NX - Error Codes and Fault Finding
Error
code
Fault Cause Boiler status/Solution
Return sensor
anomaly
Push button control
panel anomaly
Circulation insufficient
Flue sensor anomaly
Loss of remote control
communication
Bus communication
loss
Low power supply
voltage
Loss of flame signal
Block due to loss of
flame signal
Block for exceeding
gas valve frequent
maximum opening
time
T high
Intervention of DIM
v2 safety thermostat
or low temperature
safety thermostat
outside the boiler
Burner power
limitation
System flow sensor
anomaly
23
24
27
29
31
36
37
38
43
44
45
46
47
48
The board detects an anomaly on the return NTC
sensor
The board detects an anomaly on the push button
panel
This occurs if there is overheating in the boiler
due to insufficient water circulating in the primary
circuit. The causes can be:
Low system circulation - check that no shut-off
devices are closed on the heating circuit and that
the system is free of air (deaerated)
Circulating pump blocked - free the pump
The board detects an anomaly on the flue sensor
This occurs if an incompatible remote control
is connected, or if communication between the
boiler and the remote control is lost
Communication between various components
is interrupted due to an anomaly on the boiler
control unit, on the zone control unit or on the
IMG Bus
This occurs when the power supply volatage is
lower than the allowed limits for the correct boiler
operation
This occurs when the boiler is ignited correctly
and the burner flame switches off unexpectedly. A
new attempt at ignition is performed and if normal
conditions are restored, the boiler does not have
to be reset
This occurs if the 'Flame signal loss' error occurs
many times in a row within the preset period (38)
This occurs if the gas valve remains open for
longer than required for normal operation, without
the boiler switching on
The boiler detects a sudden, unexpected increase
in the T between the flow sensor and the system
return sensor
During normal operation, if an anomaly causes
excessive overheating of the flow temperature in
low temperature conditions, the boiler blocks
Should a high flue temperature be detected,
the boiler reduces power supplied so as not to
damage it
The board detects an anomaly on the system flow
sensor (Optional)
The boiler does not start (1)
If normal conditions are restored the boiler
restarts without having to be reset (1)
If normal conditions are restored the boiler
restarts without having to be reset (1)
The boiler does not start (1)
Disconnect and reconnect the power supply
to the boiler. If the remote control is still not
detected on re-starting, the boiloer will switch to
local operating mode, i.e. using the controls on
the control panel. In this case, the 'CH' function
cannot be activated (1)
The boiler does not satisfy the room heating
request (1)
If normal conditions are restored the boiler
restarts without having to be reset (1)
If normal conditions are restored the boiler
restarts without having to be reset (1) (2)
Press the 'RESET' button, before restarting, the
boiler will run a post-ventilation cycle (1)
Press the 'RESET' button (1)
The power of the burner is limited to prevent
damage to the condensation module. 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 system requirements and that the
return sensor works properly (1) (2)
In this case, after suitable cooling, it is possible
to reset the thermostat (see relative instruction
sheet) (1)
(1)
The appliance works with possible system
temperature oscillations (1)
(1) If the shutdown or fault persists, contact contact Alpha Heating Innovation Technical Helpline
(2) The anomaly can only be verified in the list of errors in the 'Information' menu
(3) Error displayed only on Climatic
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