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Customer has a 3 year old American Standard gas furnace, she said that her furnace and thermostat were fried and not working. She had an electrician come by and inspect it, but he wasn't able to do anything. Upon investigation, I found that the thermostat has failed due to a power surge that hit the home. I also found that the fuse on the control board was blown and the contactor at the condenser was fried along with wiring. I replaced thermostat, contactor, and fuse/wiring and tested all modes of operation. All components are within manufacturers specifications and system fully operational. Recommend annual maintenance and power surge protector for either home or equipment.
The flame sensor safeguards your furnace against the unsafe burning of fuel, and a dirty flame sensor may cause your furnace to function improperly. Typically, the flame sensor comes in the form of a rod that can be found near the back of the furnace, right in the path of the burner. To clean the sensor, turn off power to the furnace at the breaker box. Then, if possible, remove the sensor from the furnace. Scrub the sensor gently to remove dust and other residues. Finally, reattach the sensor and resume power to the furnace.
Even if your air conditioning unit is still working, depending on the type of system in your home today, you could recoup your investment in a new system in as little as three years. However, that doesn't mean that your system needs to be replaced. Furnaces, air conditioners, and other heating and cooling systems have made tremendous gains in efficiency over the past five years, so if you have an older unit, it is worth taking a look at whether or not a repair is the best investment.
Furnaces and thermostats are not mix-and-match appliances. Using the wrong type of thermostat with a furnace will cause operating problems and can be dangerous. Although thermostats look similar, they are designed very differently. There are numerous types of heating systems and thermostat systems and they need to be coordinated for safe and proper operation. There are three types of thermostat systems used today: millivoltage, low voltage, and line voltage.