SERVICE FEE $89 PLEASE CALL ONCE IN ROUTE WE INSTALLED THE SYSTEM ABOUT 10 YEARS AGO. DOESN'T TO MAINT WITH US. LOOKS LIKE MIKE WAS OUT IN 2015 FOR A FREON FILL. THE CUSTOMER IS NOW HAVING A PROBLEM WITH THE HEATER. HE BELIEVES THAT ITS THE CIRCUIT BOARD. -AK