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19. Incorrect function
I
n case of problem, or when the boiler has displayed an error code, the display flashes 2 digits. Please refer to the table below
to diagnose the fault.
For faults 01 and 03,
A appears on the display, the boiler is locked and the reset button illuminates (28). To reset the boiler
press the reset button
29.
29
Fig. 114
Overheating lock out
FAULT
Code
Fault description
A
01
Overheating lock out / Heat exchanger thermo fuse
A
03
No flame after safety timer
A
18
3 "flames in progress" disappearances in 1 operating cycle
A 37
CPU fault
A 39
MCU fault 1
A 40
MCU fault 2
A 41
Fan error
E 02
Pump protect (display after 40s.)
E 04
No flame detection
E 05
Anti freezing system, pump on
E 06
Anti freezing system, pump and burner on
E 07
No water circulation in primary circuit
E 08
No water in the primary circuit
E 09
DHW sensor open circuit
E 10
DHW sensor short circuit
E 11
Flow sensor open circuit
E 12
Flow sensor short circuit
E 13
Return sensor open circuit
E 14
Return sensor short circuit
E 15
Outdoor sensor open circuit (if fitted)
E 16
Outdoor sensor short circuit (if fitted)
E 18
Flame lift
E 20
Flame detect with gas valve off
E 29
Communication problem with offset unit
E30
Communication problem with offset unit
E33
Floor heating thermostat open circuit (if fitted) (ROOM THERMOSTAT FLOOR)
E 37
Communication problem with the main PCB
E 38
Reset button pressed 5 times in 15 minutes