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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.
9826
OVERHEAT
THERMOSTAT
RESET
BUTTON
Diagram 18.1
Overheat thermostat reset button
Refer to Section 20.10 to locate the overheat thermostat
reset button.
Depress the button to reset.
'10' Central heating return NTC fault
'04' Ignition fault (lockout) caused by no gas, no detection
'01' Ignition fault (lockout) caused by no gas, no detection
DISPLAY FAULT
'03' Air fault lock
'02' Air fault, pressure switch, no power to fan
'05' Overheat fault
'06' Central heating flow NTC fault
'09' Water pressure sensor fault
'11' No reception by the main board (MMI Lead)
'12' User interface or distant control panel fault
'13' Main board fault
'15' Stepper motor fault (gas valve)
'16' Gas safety valve failure
'17' Power supply <170V
'18' Local user interface fault
'19' Central heating NTC not connected to pipe
'20' User interface not compatible with boiler
'0.5bar' Lack of water fault (<0.5b)
'2.7bar' Upper water pressure (>2.7b)
'14' Over temperature on primary water circuit
'07' Domestic hot water NTC fault
'08' Micro accumulation vessel NTC fault
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