Upon arrival found there was no power to furnace, check panel and found faulty breaker After swapping breaker I found that I still had no 24v call, located bad transformer Swapped transformer and tested system charge and amp draws Explained to Cust that he had a power surge and we need to install a surge protector. Cust explained to me that he cannot figure out what breaker goes to what even tho it is labeled, found the breaker labeling to be off Explained to him we need to install a monitoring system for his panel, electric service scheduled