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13.0 Changing Components
© Baxi Heating UK Ltd 2016
13.6
Flue Sensor (Fig. 54)
1. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
2. Turn the sensor 90° anticlockwise to remove - it is a
bayonet connection.
3. Reassemble in reverse order.
13.7
Heating Flow & Return Sensors (Fig. 55)
1. There is one sensor on the flow (red wires) and one
sensor on the return (blue wires).
2. After noting the position prise the sensor clip off the pipe
and disconnect the plug.
3. Connect the plug to the new sensor and ease the clip onto
the pipe as close to the heat exchanger as possible.
13.8
Safety Thermostat (Fig. 55)
1. Pull the terminals off the safety thermostat.
2. Remove the screws securing the thermostat to the
mounting plate on the flow pipe.
3. Reassemble in reverse order, ensuring that the terminals
are pushed fully on.
13.9
DHW NTC Sensor (Fig. 56)
1. Turn off the mains cold water supply tap and draw off the
residual domestic hot water.
2. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
3. Unscrew the sensor from the hydraulic outlet assembly.
Examine the sealing washer, replacing if necessary.
4. Reassemble in reverse order. The plug will only fit one way.
13.10
Hydraulic Pressure Sensor (Fig. 56)
1. Close the flow and return isolation taps and drain the
primary circuit.
2. Disconnect the plug from the sensor.
3. Prise off the spring clip and remove the sensor. Examine
the ‘O’ ring, replacing if necessary.
4. Reassemble in reverse order.
Flue Sensor
Electrical
Plug
Fig. 54
Heating Flow Sensor
Fig. 55
DHW NTC Sensor
Fig. 56
Control Box removed
for clarity
Safety Thermostat
Pump, Gas Valve
Assemblies and Pipework
removed for clarity
Hydraulic Pressure
Sensor
Plug
Retaining Clip
