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3.0 Operating the Boiler
7
3.4 Safety Thermostat
1. Your Baxi Combi Instant 105e is fitted with an
additional safety device, which shuts down the
boiler in the event of the system or the boiler
overheating. The safety thermostat neon ( ) will
light in this instance (Fig. 14).
2. To reset: Turn the selector fully anti-clockwise
against the spring pressure to the reset position
(
R
) and release (Fig. 15). Set the selector to the
required position to light the boiler.
3. If the safety thermostat operates repeatedly,
causing boiler shutdown, a fault is indicated. Your
Service Engineer should be contacted as soon as
possible.
3.5 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 Service
Engineer (Fig. 14).
3.6 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. 14).
2. Check the pressure gauge as described in
Section 3.9. If the pressure is in the normal range,
a pump fault is indicated. Contact your Service
Engineer to determine the nature of the fault.
3.7 Sensor Fault
1. When the ( ) or ( ) neon is illuminated a
fault on the hot water or central heating
temperature sensor is indicated (Fig. 14). Contact
your Service Engineer.
3.8 Pump Protection
1. With the selector switch in either Position (i) or
Position (ii) (Figs. 16 & 17) the pump will
automatically operate for 1 minute in every 24
hours to prevent sticking.
30° 40° 50° 60° 70° 80°
Air Flow
Monitor Neon
Pump/Low
Pressure Neon
Sensor Fault
Neons
Fig. 14
Fig. 16
Fig. 17
Safety
Thermostat
Neon
Reset Position
Fig. 15