Thermo Pro 90
8 Repairing and replacing components
802
8.3
Work on stripped down components
NOTE
Seals should generally be renewed before reassembling the
heater.
Cleaning
Clean all stripped down components.
Visual inspection
•
Check all components for damage (cracks, deformation,
wear, etc.) and replace as required.
•
Inspect the connectors and cables for corrosion, loose
contacts, crimping faults, etc. and repair as required.
•
Check plug contacts for corrosion and contacts to ensure
they are secure, repairing if necessary.
8.4
Electrical connections
All electrical connections are connected separately with indi-
vidual connectors in the control unit. Before removing a com-
ponent first unplug the corresponding electrical connection.
See Chapter 11.15 "Plug assignments at control unit" on
page 1111.
8.5
Control unit
Removal
1. Remove control unit cover (see Fig. 802)
2. Unplug electrical connections (see section 8.4).
3. Release control unit and detach from the cap of the com-
bustion air fan.
Installation
1. Slide control unit onto the cap of the combustion air fan
until the clip snaps in.
2. Reestablish electrical connections (see section 8.4).
3. Close control unit cover so that it snaps in.
ATTENTION
It is important to follow the correct procedure when plugging
in the individual connectors at the control unit.
This means, all connectors are pushed by hand as far as they
will go into the respective position in the control unit. The
control unit cover is then locked.
The control unit cover is not a plug insertion aid.
It only prevents the connectors from falling out.
Fig. 802 Control unit cover
Fig. 803 Control unit
