Question about Rinnai RHFE-431FAIII 16,700 BTU Direct Vent Furnace Energy Saver Heater - Natural Gas

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Rinnai unit I have my rinnai set at 70 and it is reading 74 degrees. If I set it at 68 it will read 78. There is still heat but there still is a problem with the temp. Please help. KS

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OK, sounds like a sensor problem to me. The temperature reading is done on the backside of this unit. Remove the top cover and with a flashlight in hand, look for a small black rubber probe with yellow wires attached. You will find it about 2 inches above the floor and on the right hand side (when viewing from the front). Make sure this probe is not being influenced by the venting system and showing a “false” reading. If the vent pipe (the one covered by cloth) is close to it, the probe is made that you can relocate it out of the way of the vent. You will need to get to both the backside of the heater and go inside the heater cabinet to do this properly. If the vent is a few inches away and not influencing the probe, place a cold cloth on the probe and see if the temperature drops. Then a warm clothe on it to see if it rises. You could have a bad probe. List your model number and I can get you a part number.

Posted on May 16, 2008

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Temperature on the thermostat reads 78 and does not change even though ac is running and the room temp is 74. If I raise the setting to 80 the ac cuts off. temp does not change from 78


if the ac unit is over 7ft from the floor, that would explain what is happening
the thermostat only reads incoming air from the room and if that thermostat is higher than the people in the room , what your are feeling is the cold air but the unit is reading the hot air above you and will continue to run until the whole lot air up to the thermostat is cooled down
but setting the thermostat to a higher setting your are setting the thermostat to that uncooled air temp and so it will switch off

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I just got a new heating unit installed. However it runs constantly. If the target temp is 68 degrees it will hit 68 degrees and just keep running. It does the same at 63 degrees. Is this normal?


Dear friend! Any thermostat, it's calibrating to cut off at the end of 2nd beginning and cut in 2nd ending of temp.
Ex: In heat mode, If you set @ 68 degree, it will cut off 70 degree beginning and cut in at the end of 66 degree.
Hope it's helpful to you?

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I set temp to 74 and stop at 70 and decresing.


The only thing I can think of other than being just old and worn out is that by design it may not be set to run but so much at a time. Has this always done this since you have had it? It may be needing calibration. One thing you can try is to set it at 2 degrees higher than you want it and then it would shut off at the temp you actually want.

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Need to know what the settings are for the range adjustment A,B,C,D slide switch on the front panel on a Amana PTH123A35AC PTAC


Here they are;

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Amana calls this a Temerature Limiter and says to only set one switch on at a time. If all switches are off then the unit is at full operating range.
Please rate this answer to let me know if it was the fix.

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You can adjust the position of the room air sensor found on the back of the unit between the heater and the wall. It is a black rubber bulb with yellow wires. There is a few inches of extra wire you can extend higher to get a more accurate reading of room air. While you are back there, check for drafts that will give you false readings.

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