1. A method for diagnosing a fault condition in a climate system, the method comprising: receiving current Parameters from a climate system in the fault condition, the current Parameters including a plurality of current measured and estimated data from the climate system; determining a first set of transition probabilities based on the current Parameters; determining a second set of transition probabilities based on historical Parameters from the climate system operating under normal conditions, the historical Parameters including a plurality of historical measured and estimated data from the climate system; calculating an anomaly score for the climate system from the first set of transition probabilities and the second set of transition probabilities; and when the anomaly score is above a predefined threshold, generating automatically a diagnosis of a first problem causing the fault condition.