5
Eco
The Eco boilers are fitted with a fault code display feature.
If a fault occurs a fault code will be displayed in the LCD display screen (item 14 in Fig. 1), indicated with an alternating
flashing E followed by the fault code. A list of fault codes are given in the table below.
In the event of a fault occurring firstly check that the gas and electricity supplies are on and that any external controls fitted
are set and working correctly.
Press the reset button (item 3 in Fig. 1) on the control panel to restart the boiler if the fault occurs again, make a note of the
fault code and contact your installer or Alpha technical Helpline for further advice.
8 OPERATIONAL FAULTS
Error
code
Fault Fault description Possible causes
Gas supply
Check pressure tubes
Ignition electrode gap
Flame sensor electrode gap
Ignition generator or lead
Flame sensor electrode lead
Gas valve setting
Gas valve
PCB
Pump or flow problem
Blocked heat exchanger
Air in heat exchanger
Overheat thermostat
Thermal fuse (if open circuit then replace
primary heat exchanger)
Blocked or restricted primary flow
Heat exchanger air flow blocked
Flue restriction
Flue sensor fault
Gas valve lead connection fault
Faulty gas valve
Faulty PCB
Flow sensor wire connections
Flow sensor faulty
DHW sensor wiring connection
DHW sensor faulty
Refer to fault history codes (INFO menu d9)
Check expansion vessel pressure (1 bar)
Leak in system
Expansion relief valve operated
Primary pressure switch
Cylinder sensor wiring connections
Cylinder sensor faulty
Check internal wiring connections to PCB
Combination boiler DHW sensor X4
System boiler link X14
Refer to wiring diagram
Check fan wiring connections
Fan fault
PCB fault
Flame not detected during ignition sequence
Overheat thermostat or thermal fuse has operated
Flue thermostat intervention (flue temperature
over 113°C)
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
Incorrect cylinder sensor resistance
Incorrect wiring configuration detected
Fan wiring fault or fan faulty
Ignition failure
Overheat boiler lock
out
High flue thermostat
temperature
Gas valve electrical
connection fault
Heating flow sensor
fault
DHW sensor fault
Maximum number of
resets
Primary system
pressure low
Cylinder sensor fault
(FlowSmart only)
Internal wiring error
Fan fault
01
02
03
04
05
06
08
10
12
15
16
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