Error Codes And Fault Finding - Benchmark Alpha E-Tec Plus 28 Installation And Servicing Instruction

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
If any fault or anomaly persists, contact Alpha Heating Innovation Technical Helpline.
The history of errors can be viewed in the 'INFO' menu - d9
Error
Fault
code
01 Ignition failure
02 Overheat boiler lock
out
03 High flue temperature
04 Gas valve electrical
connection fault
05 CH flow sensor fault
06 DHW sensor fault
08 Max. number of resets
10 Primary system
pressure low
12 DHW inlet sensor fault
15 Incorrect configuration
16 Fan fault
20 Flame sensing fault
22 PCB fault
23 Return sensor fault
24 Control panel button
fault
* When external zone valves are fitted an external by-pass must also be installed.
Fault description
Flame not detected during ignition sequence
Overheat sensor has activated
Flue sensor intervention (flue temperature too
high)
Gas valve wiring circuit fault detected
Incorrect flow sensor resistance value
DHW sensor resistance value is incorrect
Maximum number of resets reached (5)
Primary pressure switch has operated
Optional DHW inlet sensor resistance out of
range
Incorrect hydraulic configuration
There is an inconsistency between the settings
and signals received from the PCB
Fan wiring fault or fan faulty
False flame detection
Flame detected but gas valve is not open
PCB software error
Return sensor resistance out of range
Control panel button stuck in the on position
Alpha E-Tec Plus 28, 33 and 38 - Error Codes and Fault Finding
Possible causes
Gas supply
Check ignition/sensing electrode
Ignition generator or lead
Gas valve operation
Check PCB and wire connections
Flue restriction or blockage
Pump or restricted flow problem
Blocked heat exchanger
Air in heat exchanger
Check external valves/circuit *
Blocked or restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Air in primary heat exchanger
Gas valve lead connection fault
Faulty gas valve
Faulty PCB
Flow sensor wire connections or sensor faulty
DHW sensor wiring connection or sensor faulty
Refer to fault history codes (INFO menu d9), to
reset by turning the boiler off and on.
If it will not clear replace PCB
Check expansion vessel pressure (1 bar)
Leak in system
Expansion relief valve operated
Primary pressure switch
Check sensor wiring and connections
Check sensor resistance
Check the settings of the 'A' family parameters
Check fan wiring connections
Fan fault
PCB fault
Check flame sensing electrode and lead
Electrical short circuit on sensing wires
PCB fault
Replace PCB
Check sensor wiring and connections
Check sensor resistance
Check for jammed control panel buttons
Check for jammed PCB buttons
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