It sounds like you're experiencing recurring issues with the float assembly on your Hobart AM14 dishwasher. You've already ruled out potential causes such as heat and electrical issues, and have even replaced the main board to try to resolve the problem. However, you're still encountering failures with the float assembly, which is unusual given that the dishwasher has been in use for 18 years without any prior issues with the float.
Without additional information or an on-site inspection, it's difficult to pinpoint the exact cause of the float assembly failures. However, some potential causes could include:
- Damage or wear to the float assembly parts: Over time, the float assembly parts may become worn or damaged, which can affect their performance and lead to failures.
- Water quality issues: Poor water quality, including high mineral content or excessive amounts of chemicals, can damage the float assembly or cause it to malfunction.
- Improper installation: If the float assembly is not installed correctly, it may not function properly and could fail prematurely.
- Inconsistent usage: If the dishwasher is not used consistently or is used excessively, this could put strain on the float assembly and cause it to fail more frequently.
It's important to work with a qualified technician who has experience with Hobart AM14 dishwashers to diagnose and resolve the issue. They can inspect the dishwasher, including the float assembly and other components, and identify any potential causes of the failures. From there, they can recommend the appropriate course of action to resolve the problem and prevent future failures.