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Hello again and thank you for your question, I assume you are referring to the code P0440. See the test steps in the link below. Let me know if you need anything else and we can work from there.https://dl.dropboxusercontent.com/u/104923897/P0440%20Oct%2026.pdf
Yes check the FTP sensor first and let me know the results and also if you are setting the same code, I'm working from memory here and I may have forgotten something. Let me know, I'm here all day .
Its the one on the top of the tank