MY UNIT WAS INSTALLED IN 1992.WHILE STILL UNDER WARRENTY THE JOHNSON CONTROL UNIT WAS REPLACED.
THE UNIT WORKED FINE FOR A WHILE. THE NEXT WINTER
THE UNIT HAD TO BE SWICHED OFF ONCE. THE NEXT YEAR IT GOT WORSE REQUIRING MORE TIMES TO SWITCH IT OFF AND ON. HAD INSTALLER LOOK AT IT THEY CLEANED AND PLAYED WITH IT UNTIL IT WORKED FOR AWHILE. THEN IT STARTED TO ACT UP AGAIN. A YEAR OR TWO LATTER THEY WERE CALLED BACK AND PLAYED WITH IT AGAIN AND IT WORKED ALRIGHT FOR SOME TIME.
THIS TIME THEY SAID THAT THE JOHNSON CONTROL UNIT
SHOULD BE REPLACED IF IT CONTINUED TO ACT UP.