Fault Finding; Overheat Thermostat Reset Button - Saunier Duval 47-920-36 Instructions For Use Installation And Servicing

Before trying to operate the boiler make sure that :
• All gas supply cocks are open and that the gas supply has
been purged of air.
• The heating system pressure is at least 1 bar.
• There is a permanent mains supply to the boiler and that the
polarity is correct.
WARNING. Always isolate the boiler from the electrical supply
before carrying out any electrical replacement work.
Always check for gas soundness after any service work.
Should there be any doubt about the voltage supply to any of
the components, it is possible to carry out a simple electrical
test to ensure all is operational in that area.
IMPORTANT: On completion of the fault finding task which has
required the breaking or remaking of the electrical connections,
the continuity, polarity, short circuit and resistance to earth
checks must be repeated using a suitable multimeter.
DISPLAY
'01' and 'F' and 'flashing red LED'
'02' and 'F' and 'flashing red led'
'05' and 'F' and 'flashing red LED'
'06' and 'F' and 'flashing red LED'
'09' and 'F' and 'flashing red LED'
'11' and 'F' and 'flashing red LED'
'12' and 'F' and 'flashing red LED'
'13' and 'F' and 'flashing red LED'
'14' and 'flashing red LED'
'15' and 'F' and 'flashing red LED'
'16' and 'F' and 'flashing red LED'
'17' and 'F' and 'flashing red LED'
'18' and 'F' and 'flashing red LED'
'19' and 'F' and 'flashing red LED'
'20' and 'F' and 'flashing red LED'
'0.5bar' flashing and 'F' and 'flashing red LED'
'2.7bar' flashing and 'F' and 'flashing red LED'

18 Fault Finding

Overheat thermostat reset button

Refer to Section 20.10 to locate the overheat thermostat
reset button.
Depress the button to reset.
F30E/F30E SB shown
FAULT
Ignition fault (lockout) caused by no gas, no detection
Air fault, pressure switch, no power to fan
Overheat fault
Central heating flow NTC fault
Water pressure sensor fault
No reception by the main board (MMI Lead)
User interface or distant control panel fault
Main board fault
Over temperature on primary water circuit
Stepper motor fault (gas valve)
Gas safety value failure
Power supply <170V
Local user interface fault
Central heating NTC not connected to pipe
User interface not compatible with boiler
Lack of water fault (<0.5b)
Upper water pressure (>2.7b)
37
OVERHEAT
THERMOSTAT
RESET
BUTTON
Diagram 18.1
4000123924-2