I work in the commercial building automation field, so I'm fairly good with controls, but I'm not familiar with the diagnosis a friend had after her home AC quit working.
This is her quote from the tech. They want to replace the main board. "He found a bad main board due to reverse polarity on furnace. Posible further problems."
I don't know what further problems there could be, other than some burned out contacts, but how could this happen at this point in it's life? The system was installed in 1985, and I don't think there's been much work on it since. She's been in the place for 2-3 years and hasn't had any problems or any other work done on her house, so I don't understand how reversed polarity could have suddenly happened.
Any help would be appreciated!
Thanks
This is her quote from the tech. They want to replace the main board. "He found a bad main board due to reverse polarity on furnace. Posible further problems."
I don't know what further problems there could be, other than some burned out contacts, but how could this happen at this point in it's life? The system was installed in 1985, and I don't think there's been much work on it since. She's been in the place for 2-3 years and hasn't had any problems or any other work done on her house, so I don't understand how reversed polarity could have suddenly happened.
Any help would be appreciated!
Thanks