Controller
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 16
7. Slide the controller and mounting plate outwards and out
of the unit.
• The mounting plate has three key-ways holding it in
place (no nuts or other fasteners).
8. With the controller and mounting plate out of the unit,
use a ¼” socket or nut driver to remove the four nuts
attaching the controller to the bracket. The controller is
supported by four small bushings - ensure that all four
bushings remain on the bracket screws. Remove and
discard the defective controller.
9. Plate new controller onto the mounting plate.
• Ensure the controller is properly oriented - reference
Figure 20.
10. Using the 4 nuts previously removed, fasten the controller
to the mounting plate.
11. Insert the controller and mounting plate into the Aqua-
Hot. As you insert the controller and mounting plate into
the Aqua-Hot, the mounting plate should slide along the
wall to ensure the key-ways catch the mounting studs
(Figure 18).
12. Once the controller and mounting plate are properly
seated on the mounting studs, fasten the mounting
plate to the wall of the Aqua-Hot using the previously
removed hex nuts.
13. Carefully reinstall all of the plugs from the DC harness.
• Ensure that both tabs for all Molex connectors click
into place indicating a properly seated connection.
• Ensure that the single tab for the RVC cable clicks
into place indicating a properly seated connection.
• Suggested order:
• 8-Pin Molex (bottom of the controller)
• 15-Pin Molex (middle left of the controller)
• RVC (middle right of the controller)
• 9-Pin Molex (top left of the controller)
• 12-Pin Molex (top right of the controller)
• 3-Pin Molex power connector
NOTE:
All plugs have only ONE correct orientation. Do
NOT
force the plug into place.
Figure 18
9-Pin
Molex
12-Pin
Molex
RVC
8-Pin
Molex
15-Pin
Molex
Figure 20
Figure 19
