15.0 Changing Components
46
© Baxi Heating UK Ltd 2012
15.3
Flowswitch
(Fig. 47)
1. Drain the boiler (see Section 15.1 paragraph 2 & 3).
2. Remove the two screws on the support bracket.
3. Remove the clip securing the flow pipe to the
flowswitch.
4. Disconnect the inline electrical connection.
5. Pull pipe away from flowswitch.
6. Remove the two screws securing the flowswitch to
the boiler.
7. Remove the flowswitch.
8. Fit the new flowswitch and reassemble in reverse
order.
9. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 12.1).
Flow Switch
Clip
Flow Pipe
Fig. 47
Support Bracket
15.4
PCB
(Figs. 48 & 49)
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate at supply
before access.
1. Pull the control knob off the spindle and remove the
plastic button cover. Refit them onto the new PCB
(Fig. 48).
2. Remove the top right hand securing screw and hinge
down the PCB housing and disconnect the electrical
connections noting their positions
NOTE: Check the PCB for the presence of input
jumpers - see section 10.8. Set the new PCB as the
one removed.
3. Lift Control PCB housing out of hinge housing of
metal bracket.
4. Fit the new PCB Housing Assembly and reassemble
in reverse order.
PCB Housing Securing
Screw
Control
Knob
Fig. 48
Blue (CN11) Jumper
Red (CN12) Jumper
Fig. 49
Hinge down
PCB Housing
Plastic
Button
Cover