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14.0 Changing Components
© Baxi Heating UK Ltd 2012
Central Heating
Temperature Sensor
Safety Thermostat
Flow Pipe
Fig. 84
DHW Temperature
Sensor
Fig. 85
Plate Heat
Exchanger
Pressure Sensor
Flue/Heat Exchanger
Thermostat Sensor
Electrical
Plug
Fig. 83
14.8 Flue/Heat Exchanger Thermostat Sensor
(Fig. 83)
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.
14.9 Water Pressure Sensor (Fig. 85)
1. Drain the primary circuit.
2. Disconnect the two wires from the sensor.
3. Undo the nut on the flow pipe securing and sealing the
sensor.
4. Remove the sensor, examine the sealing washer, replacing if
necessary.
5. Reassemble in reverse order. The component is not
polarised - either wire will fit each terminal.
14.10 Central Heating Temperature Sensor (NTC)
(Fig. 84)
1. Ease the retaining tab on the sensor away and disconnect
the electrical plug.
2. Unscrew the sensor from it’s pocket and reassemble in
reverse order. The plug will only fit one way.
14.11 Safety Thermostat (Fig. 85)
1. Pull the plug off the thermostat.
2. Remove the screws securing the thermostat to the
mounting plate on the flow pipe.
3. Reassemble in reverse order, ensuring that the plug is
pushed fully on.
14.12 DHW Temperature Sensor (NTC) (Fig. 85)
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 plate heat exchanger
manifold. Examine the sealing washer,replacing if necessary.
4. Reassemble in reverse order. The plug will only fit one way.