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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