Does either the 501 or 550 series stats have "L" terminal for diagnostic light from JEZ condensers? My system has two stage communicating RGPE furnace, so I want to use a communicating thermostat, just curious if either of these stats will display fault light from UAPM-JEZ unit. Although fault indication to stat via L terminal isn't that important, because the faults are displayed on JEZ circuit board.

Thanks,
tripntx