Technical data

4000123924-2

18 Fault Finding

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.

'01' and 'F' and 'flashing red LED' Ignition fault (lockout) caused by no gas, no detection

DISPLAY FAULT

'02' and 'F' and 'flashing red led' Air fault, pressure switch, no power to fan

'05' and 'F' and 'flashing red LED' Overheat fault

'06' and 'F' and 'flashing red LED' Central heating flow NTC fault

'09' and 'F' and 'flashing red LED' Water pressure sensor fault

'11' and 'F' and 'flashing red LED' No reception by the main board (MMI Lead)

'12' and 'F' and 'flashing red LED' User interface or distant control panel fault

'13' and 'F' and 'flashing red LED' Main board fault

'15' and 'F' and 'flashing red LED' Stepper motor fault (gas valve)

'16' and 'F' and 'flashing red LED' Gas safety value failure

'17' and 'F' and 'flashing red LED' Power supply <170V

'18' and 'F' and 'flashing red LED' Local user interface fault

'19' and 'F' and 'flashing red LED' Central heating NTC not connected to pipe

'20' and 'F' and 'flashing red LED' User interface not compatible with boiler

'0.5bar' flashing and 'F' and 'flashing red LED' Lack of water fault (<0.5b)

'2.7bar' flashing and 'F' and 'flashing red LED' Upper water pressure (>2.7b)

'14' and 'flashing red LED' Over temperature on primary water circuit

Overheat thermostat reset button

Refer to Section 20.10 to locate the overheat thermostat

reset button.

Depress the button to reset.

9749

OVERHEAT

THERMOSTAT

RESET

BUTTON

Diagram 18.1

F30E/F30E SB shown