Preform maintenance on Oil fired boiler ( everything but burner ), (3) hydro air handlers, (1) bypass humidifier and control board replacement on zoned attic air handler : CONTROL BOARD ATTIC A/H: * shut power to the air handler * Open air handler cabinet door * Open electrical cabinet door * Disconnected and removed existing control board from electrical cabinet * Disconnected all electrical wiring from the existing control board * Installed and secured brand new control board inside of air handler * Connect and secure all high and low voltage wiring back to new control board * Return wiring back to original position before temporary repair was made * Review all connections and return power to the system * Call for heating at the thermostat and test system operations- Confirm with a call for heat the Hydro coil is hot and the blower motor is on and running normally * Cycle system on and off to confirm normal operations- okay OIL BOILER: * test and check expansion tank, water fee