Baxi Potterton 105E Safety Thermostat, Air Flow Monitor, Pump Fault or Low Pressure, Sensor Fault

		Pump/Low
Air Flow		Pressure Neon
Monitor Neon			Sensor Fault
Safety			Neons
Thermostat
Neon
30° 40° 50°	60° 70° 80°

Fig. 14

Reset Position

Fig. 15

Fig. 16

Fig. 17

3.0Operating the Boiler

3.4Safety 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.

3.5Air 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).

3.6Pump 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.

3.7Sensor 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.

3.8Pump 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.

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