Arrived on site to perform diagnostic on heat pump unit. Unit is not heating, and thermostat is displaying no power on screen. Checked indoor air handler electrical and components. Found that unit was getting low voltage power, but not low voltage was not present. Found bad transformer that was not converting high voltage to low voltage. Also found that indoor unit does not have a service disconnect in attic, which leaves the unit unprotected to electrical damage. No surge Protection as well. Ductwork is in very poor condition as well. Went over findings and recommendations with homeowner over phone. With approval went ahead and replaced transformer at indoor unit. Restored power and cycled unit. System is now heating, temperature split within range. Signed up for maintenance program. System is operational upon departure.