Performed heating maintenance on one gas fired Hot water boiler removed and clean burners and clean standing pilot assembly replaced thermocouple clean burner tray checked expansion tank and automatic water feed turn system on and checked boiler operation left functional also performed Heating maintenance on four Hydro air handles check blowers, and Blower motors checked heating coils and sprayed replaced filters April air 210 Four filters in total turn systems on and checked operations diagnosed Heating zone Honeywell R845A relay for the living room is malfunctioning for proper operation of the system this relay has to be replaced all other systems are functional Office personnel please follow up with the homeowner for a price quote for a Honeywell relay R845A