Marco 1000830, Service Manual

Page: 27 / 42

SP9 ServiceManual.docx 06/02/2015 Page 27 of 42
Display Board Replacement
Remove the ribbon cable from the display
board. Remove the four retaining nuts.
When removing the display board, be careful
not to lose any spacers, as the distance
between the display board and front panel is
critical to the operation of the switches on the
board.
Fit the replacement board and replace the four
retaining nuts.
Do not over-tighten, as this will affect the
distance between the front panel and the
display board.
Figure 17.
24vdc Power Supply Replacement
Disconnect power to the under counter unit. The cable connections can be removed before
removal of the 24vdc power supply or after the retaining screws have been removed, depending on
access and preference.
The 24vdc power supply is retained on its mounting bracket by two screws, accessible from the
bottom of the bracket. Remove the two screws (and the cable connections, if applicable) and
remove the 24vdc power supply. Replace the 24vdc power supply and the cable connections.
Ensure the connections are replaced back in to the correct terminals.
Water Level Probes Replacement
To replace the water level probes, empty the tank and gain access through the tank lid opening.
Disconnect the wiring harness from the outer threading part of the probe. While holding the probe
on the inside of the tank, remove the retaining nut on the outside. The probe can now be removed
and replaced. See diagram on next page.
Note: Probes should only be replaced if leaking or physically damaged. Usually, any probe
issues can be resolved by cleaning them with ScotchBrite.
Heating Element Replacement
To replace the heating element, empty the tank and gain access through the tank lid opening.
Disconnect the spade connectors from the outer connectors of the heating element. While holding