a chiller including a compressor, a condenser, a pump, an evaporator and a fan, the chiller providing a fluid at a selectable set point of temperature, the chiller having an integrated self-testing system comprising: a) an air temperature sensor; b) a fluid temperature sensor; c) a controller, the controller generating in response to a user selection a first pretest signal for turning the fan on, the compressor off and the pump off, the controller connected to the air temperature sensor to measure the ambient air temperature resulting from the first pretest signal, the controller further generating a self-test signal to the chiller to change the set point of temperature of the chiller a preselected amount, the controller further connected to the fluid temperature sensor to determine the self-test cooling rate for the chiller to obtain the change in the set point, the controller further calculating an expected self-test cooling rate using the ambient air temperature and a factory self-test cooling rate stored in memory, and the controller further comparing the self-test cooling rate and the expected self-test cooling rate and generating a signal indicating whether the self-test cooling rate and the expected self-test cooling rate deviate by more than a preselected threshold; d) memory connected to the controller, the memory including preloaded factory self-test cooling rate; e) An output interface for providing a signal for determining whether servicing the chiller is desired based upon adjusting the factory operational parameters based upon the ambient condition data comprising at least one of temperature and pressure and comparing the adjusted factory operational parameters and; an output interface connected to the controller for providing a signal indicating service requirement status in response to a controller input indicating that the self-test cooling rate and the expected self-test cooling rate deviate by more than a preselected threshold. a) an air temperature sensor; b) a fluid temperature sensor; c) a controller, the controller generating in response to a user selection a first pretest signal for turning the fan on, the compressor off and the pump off, the controller connected to the air temperature sensor to measure the ambient air temperature resulting from the first pretest signal, the controller further generating a self-test signal to the chiller to change the set point of temperature of the chiller a preselected amount, the controller further connected to the fluid temperature sensor to determine the self-test cooling rate for the chiller to obtain the change in the set point, the controller further calculating an expected self-test cooling rate using the ambient air temperature and a factory self-test cooling rate stored in memory, and the controller further comparing the self-test cooling rate and the expected self-test cooling rate and generating a signal indicating whether the self-test cooling rate and the expected self-test cooling rate deviate by more than a preselected threshold; d) memory connected to the controller, the memory including preloaded factory self-test cooling rate; e) An output interface for providing a signal for determining whether servicing the chiller is desired based upon adjusting the factory operational parameters based upon the ambient condition data comprising at least one of temperature and pressure and comparing the adjusted factory operational parameters and; <EOS>