Baxi Potterton COMBI 105 HE - Manual (Page 6)

3.0 Fault Indication
6
© Baxi Heating UK Ltd 2009
3.1 Air Flow Monitor
1. The boiler is fitted with an air pressure sensing device. This
monitors the flue system.
2. If the ( ) neon illuminates it indicates that the flue or
flue terminal is blocked or obstructed in some way, or that
there is an internal fault. If there is no external blockage of the
flue terminal that can be easily removed contact your Installer
or Service Engineer (Fig. 1).
3.2 Pump Fault or Low Pressure
1. The neon ( ) will illuminate if the circulating pump is
faulty or the system pressure drops below the minimum
requirement (Fig. 1).
2. Check the pressure gauge as described on page 8. If the
pressure is in the normal range, a pump fault is indicated.
Contact your Installer or Service Engineer to determine the
nature of the fault.
3.3 Sensor Fault
1. When either of the ( ) or ( ) neons is illuminated a
fault on one of the temperature sensors is indicated (Fig. 1).
Contact your Installer or Service Engineer.
3.4 Pump Protection
1. With the selector switch in the on position (Fig. 2) the
pump will automatically operate for 1 minute in every 24
hours to prevent sticking.
3.5 Safety Thermostat
1. Your Baxi Combi HE is fitted with an additional safety
devices, which shut down the boiler in the event of the
system, boiler or flue overheating. The safety thermostat neon
( ) will light in this instance (Fig. 1).
3.6 Flame Failure
1. The red flame failure neon ( ) will illuminate in the event
of the burner failing to light, when incomplete lighting of the
burner occurs or blockage of the condensate drain (Fig. 1).
To Reset the Safety Thermostat or Flame Failure
1. To reset: Turn the selector fully anti-clockwise against the
spring pressure to the ‘Reset’ position for at least two seconds
and release (Fig. 3).
2. If after turning the selector to the ‘Reset’ position the boiler
does not relight or the safety thermostat or flame failure
operates repeatedly, causing boiler shutdown, a fault is
indicated. Your Installer or Service Engineer should be
contacted as soon as possible.
30 o 40 o 50 o 60 o 70 o 80 o
Air Flow
Monitor Neon Pump/Low
Pressure Neon
Sensor Fault
Neons
Reset
Fig. 1
Fig. 2
Safety Thermostat
Neon
Reset
Fig. 3
Flame
Failure
Neon
NOTE: The neons annotated have a dual function, indicating the temperature of the
central heating water when constantly illuminated or begin to flash to indicate a fault.