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Problem with Heating Tanks

George Best

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I have a Fuji Frontier 340 Machine. Its been working but recently it gives me a message about the Temperature of the ps1-4 heating temperature out of range, safety thermostat 401-404 has been switched on and heaters have been turned off.

And then the temperature stops rising. I turn the machine off several time, clean the filters on the side of the machine, and in the ps1-3 tanks, but it doesn't always help

Has anyone ever encountered such a problem.

Any help will be appreciated.

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