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14.0 Changing Components
© Baxi Heating UK Ltd 2011
14.20 Plate Heat Exchanger (Fig. 94)
1. Drain the boiler primary circuit and remove the gas valve
as described in section 14.24.
2. While supporting the heat exchanger undo the screws
securing it to the brass manifolds.
3. Withdraw the heat exchanger upwards, taking care not to
damage any wires or controls.
Seals
4. There are four rubber seals between the manifolds and
heat exchanger which may need replacement.
5. Ease the seals out of the manifold. Replace carefully,
ensuring that when the seal is inserted into the manifold it is
parallel and pushed fully in.
6. When fitting the new heat exchanger note that the left
hand location stud is offset towards the centre more than the
right hand one.
7. Reassemble in reverse order.
14.21 Diverter Valve - Motor Unit & Assembly
(Fig. 95)
1. To replace the motor unit, disconnect the multi-pin plug.
2. Pull off the retaining clip and remove the motor unit.
3. The motor unit can now be replaced, or the valve
assembly removed.
4. Drain the primary circuit and draw off any hot water once
the isolating taps are closed.
5. Undo the nuts on the tap rail under the boiler. Remove
the screws securing the valve assembly to the boiler bottom
panel and plate heat exchanger.
6. Remove the valve assembly. Examine any seals or washers,
replacing if necessary. Transfer the DHW NTC to the new
valve and reassemble in reverse order.
Plate Heat Exchanger
Rubber Seal
Fig. 94
Motor Unit
Multi-pin Plug
Retaining Clip
Valve
Assembly
Fig. 95
LH Location Stud
Pressure Sensor