Morev4 Posted April 17, 2015 Share #1 Posted April 17, 2015 What would make the class control box to just display PSI on the screen? No E4 or other error code. It has to be the compressor or something besides the controller as I tried a spare one and that also just displays the psi symbol and nothing else. Link to comment Share on other sites More sharing options...
Prairiehammer Posted April 17, 2015 Share #2 Posted April 17, 2015 (edited) Jim, the PSI graphic is printed and permanently displayed. It is not a part of the LCD display. The CLASS only displays and operates when in the ACC position of the ignition switch. There is no display when the ignition switch is in the ON position. Have you checked the CLASS fuse? Edited April 17, 2015 by Prairiehammer Link to comment Share on other sites More sharing options...
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