Super tune up performed today on a ten year old Coleman heat pump with air handler. All electrical connections are tight with no corrosion. X13 blower motor is acceptable. Blower wheel and evaporator coil are clean. Heat strips are pulling proper amperage. Heat strips will only run in emergency heat. The defrost control board is not passing power to heat strips in auxiliary heat. Suggest replacing defrost control board. Refrigerant levels are in range. Outdoor unit was washed and waxed. Customer declined repairs at this time.