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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.

Air Flow

Monitor Neon

Safety Thermostat

Neon

Flame

Failure

Neon

Fig. 1

Reset

Fig. 2

Reset

Fig. 3

Pump/Low

Pressure Neon

Sensor Fault

Neons

3.0 Fault Indication

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 (

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 (

of the burner failing to light, when incomplete lighting of the

burner occurs or blockage of the condensate drain (Fig. 1).

3.7

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.

) neons is illuminated a

) will illuminate in the event