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

1 Answer

Rinnai 431wt my heater is set at 72 degrees. how to set to 78 degrees. when depressing stays to 72 won't go beyond.

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  • mandlross Nov 22, 2008

    I have a Rinnai Energysaver 557FTR and I want to know how to adjust the temperature.

    I just bought the property and have no instructions manual.

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1 Answer

Bad thermastat

Posted on Oct 29, 2008

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How to reset the thermostat to shut off after 2 degrees/CT87B-4008?


on these thermostats remove the outer ring cover and in the lower right side you will see a slide adjustment. move it i believe left for closer cycles and right for longer cycles. it should be 2* on either side of set point. remember that the fan is not furnace shut off.and turning back and forth will not tell you anything. just set it and see how it works then change it again if you need to

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I have a Rinnai 556F Heater and I set it to a specific Temperature and a temperature higher is always flashing. What is wrong?


The temp you are looking at may be an error code. 72 Room sensor, 68 Over heat, 76.80 Room sensor short, etc. What is the exact code??

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Have a 1004fa model to heat a room. temp on


You may have a bad circuit board. Depending upon the age of the heater it may still be under warranty. Contact Rinnai (in US) 800-621-9419 with your serial number and installation date. Ask if they can offer a solution. Good Luck!

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2 Answers

AC Thermostat is set to 78 but wont cool past 79 or 80


If your unit is running 24/7 you are either low on charge or the unit is to small for your house.
A 20° temperature difference is about normal for the room air vs the air coming out of the ducts, but the room air and the leaving air should keep getting colder and colder.
An air conditioner should cycle approximately 3 maybe 4 times in an hour if it's properly sized.
As for the thermostat thermometer they are very cheap and are more for reference than actual temperature, so if 78° is not comfortable, then you should set it lower but not rely on thermostat being accurate or what the thermometer is saying as long as it is consistent.
The air conditioner and thermostat can also be set below 78°, there's a lot of people set them at 72° and below with no problems.
the only thing is if you have real low humidity you'll need to watch indoor coil or the suction line (the big line) on your outdoor unit and make sure it doesn't freeze up on you.

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1 Answer

Rinnai 431WT blinking53


Wooden,

You have some problem with the spark. Either it didn't come on or it stayed on longer than it should. Try to start the heater and look into the burner you should see a spark in the pot.

Tom Hawkins
hawkins111@gci.net

Apr 09, 2009 | Rinnai RHFE-431FAIII 16,700 BTU Direct...

1 Answer

Rinnai 431wt filter light won't go out


If you have changed the filter, and the light stays on then you need to let the system stay down for 24 hours without running. Also go ahead and check the vent cap on the outside of the unit. The light will go awaa by itself if you need to use the system

Feb 08, 2009 | Rinnai RHFE-431FAIII 16,700 BTU Direct...

1 Answer

Rinnai unit


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.

Jan 15, 2008 | Rinnai RHFE-431FAIII 16,700 BTU Direct...

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