Alpha E-Tec Plus 28NX - Error Codes and Fault Finding

10 ERROR CODES AND FAULT FINDING
10.1 CARRY OUT INITIAL FAULT FINDING CHECKS
In the event of a suspected functional fault with the boiler, carry out initial fault finding checks to establish the
cause.
1. Check the correct gas, electrical and water supplies are available at the boiler.
2. Check the boiler system pressure is in the green area when cold.
3. Check that any boiler controls fitted are working and in an 'ON' position.
4. Carry out electrical supply and connection checks and check all fuses.
Where an error code is displayed use the following tables to identify the fault and possible causes.
10.2 ERROR CODES AND FAULT FINDING
Alpha E-Tec Plus 28NX, 33NX and 38NX - Error Codes and Fault Finding
If any fault or anomaly persists, contact Alpha Heating Innovation Technical Helpline.
The history of errors can be viewed in the 'INFO' menu - d.9.
(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
Error
code
Fault Cause Boiler status/Solution
Press the 'RESET' button (1)
Press the 'RESET' button (1)
Press the 'RESET' button (1)
Press the 'RESET' button (1)
The boiler does not start (1)
Press the 'RESET' button (1)
In this case the boiler continues to supply DHW
but not with optimal performance (1)
(3)
The anomaly can be reset 5 times
consecutively, after which the function is
inhibited for at least one hour. One attempt is
gained every hour for a maximum of 5 attempts.
By switching the boiler on and off again the 5
attempts are re-aquired
Check on the boiler pressure gauge that the
system pressure is 1 - 1.2 bar cold. Restore to
the correct pressure if necessary
If normal conditions are restored the boiler
restarts without having to be reset. Check that
the boiler is configured correctly (1)
Press the 'RESET' button (1)
Press the 'RESET' button (1)
In the event of a demand for CH or DHW the
boiler does not switch on within the preset time.
Upon boiler commissioning or after an extended
shut down the may go to 'lock out'
Overheat sensor has activated
Flue sensor intervention (flue temperature too
high)
The PCB detects a fault on the gas valve supply.
Check its connection. (The fault is detected and
displayed only in the presence of a request).
Upon confirming that the fault does not concern
the gas valve, you must replace the PCB if the
fault does not disappear after pressing the Reset
button
The board detects an anomaly on the NTC flow
sensor.
Safety themostat triggered
The board detects an anomaly on the DHW NTC
sensor. In this case the antifreeze function is also
inhibited
The boiler is in chimney sweep or calibration
operation
Number of allowed resets already performed
Water pressure inside the central heating
circuit that is sufficient to guarantee the correct
operation of the boiler is not detected
If the board detects an anomaly or incongruity on
the electric wiring, the boiler will not start
This occurs if the fan has a mechanical or
electrical fault
This occurs in the event of a leak on the detection
circuit or anomaly in the flame control unit
Ignition failure
Overheat boiler lock
out
High flue temperature
Gas valve electrical
connection fault
CH flow sensor fault
DHW sensor fault
Chimney sweep
function
Maximum number of
resets
Insufficient system
pressure
Configuration error
Fan anomaly
Parasite flame block
01
02
03
04
05
06
07
08
10
15
16
20
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