ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
UIM
The UIM (User Interface Module) is the display on the front of the water heater. The UIM’s major components include a Circuit Board with LCD display and a Button Pad Overlay which contains the five user input buttons.
Service Notes - Button Pad Ribbon Cable
The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be plugged in exactly as shown in the images below; with the metal crimp connections visible on the plug end and the UIM Circuit Board back facing out. There are six pins on this Ribbon cable socket, Ensure all six pins are inserted into the Ribbon Cable plug whenever removing or installing the UIM or Button Pad Overlay.
Failure to connect this Ribbon cable exactly as shown when servicing will render the User Input Buttons inoperable. This should be checked whenever the nature of the service complaint is an inoperable or unresponsive controller or UIM.
Button Pad Overlay
Ensure Ribbon Cable Plug is inserted exactly as shown.
UIM Circuit Board Back | |
J2 Socket - CCB | J3 Socket - Button Pad |
Communication | Communication |
Ribbon Cable To | |
Button Pad |
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LCD | UIM Circuit Board Front | |
Screen | ||
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Technical Literature Department | 27 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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