Today I came to Kira and Sarah’s Dover home because the furnace is not working. Kira has explained that she attempted to install a nest thermostat and crossed sone wires causing the disconnect, fuse, and transformer to fail. She replaced them all and the new transformer started to smoke. I reviewed the wiring diagram and found the transformer was installed properly. I tested both transformers on direct power and both have failed. This could be caused by damage to the control board but we can not determine that until a new transformer is installed. The unit is 15 years old and is known for secondary heat exchanger issues. Kyra will discuss the options with Sarah and will let us know how they choose to proceed. If a replacement is chosen, today’s bill will be applied to the cost of the installation.