You need to stop using the heater, , the thermostat is bad and there is a risk of a fire, and no repair parts. Replacement heaters range $20-40.. Personally I would look at a different brand.
Thank you Steve
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SOURCE: Freezer set at 0 degrees, but runs at 19 degrees. Ice Cream melting...
Low on freon/refrigerant maybe.
SOURCE: Rinnai 1004 - Temp on thermostat reads 10 deg cooler than actual, keeps running
Behind the unit near the floor level, is a yellow wire with a black bulb at the end. This is the actual sensor for returning air. If there is cool air infiltrating the area where it is located, it will keep the unit running until the return air reaches temperature. You could also have a bad sensor but highly unlikely. Make sure there is no air infiltration influencing the sensor. Also, you can unclip the sensor and pull out a few more inches of wire to locate it higher up away from the floor. Tie it up with a wire tie.
Rinnai it testing a remote thermostat but as of yet, there is no plans to offer one.
SOURCE: Honeywell T87f 3855 Doesn't Activate Heater
thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.
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