Question about Rinnai RHFE-1004FA 38,400 BTU Energy Saver Ductless Heater - LP Gas

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Rinaai LP space heater will not shut off when set temp is reached

We recently had a Rinnai 1004FA installed. We lost our propane furnace to flooding & now the Rinaai is our main heat source. Because times have been tough, we started out with the "economy" setting, and the propane level on our tanks were 70% when it was installed.
9 days later, our propane tanks were at 30 %!!!!!!!!!!!!

I immediatly called the propane CO, who sent out a repairman to check for a leak.
He promptly told us that when you set it to "economy", it NEVER shuts off!
So much for "energy saving"!

Anyway, he removed the side panel & raised the thermistor to just above the top of the unit.

Umm, not quite!

For the past 3 days, I have it set to 60
Even after reaching the 60 degrees, it will NOT shut off.

If I set it to the "low" setting, (55-58 degrees), it will shut off, obviously because the room was just at 60, but min later, on it goes again!

No matter what temp I set it at, it doesn't shut off when it reaches the set temp.

I am totally stressing myself out as to what my next propane bill will be.

I CANNOT afford another $300 bill every 2 weeks :(


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  • sharonmaried
    sharonmaried Jan 02, 2009

    Please! Anyone! :(

  • sharonmaried
    sharonmaried Jan 02, 2009

    Yeah, I really didn't think so :(

  • Thomas Hawkins May 11, 2010

    If the thermistor checks out OK your stove is functioning correctly. Rinnai heaters are great unit but they do have some limits. If your house is older with old windows you may be expecting too much from your unit. After all it is a space heater not a complete home furnace. If the unit is keeping your space comfortable and still continues to run you can move the thermistor up or down on the wall away from the window to find a spot that work for you.

    Tom Hawkins :


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Test the thermistor by using an ice cube. Place the cube on the thermistor and see if the unit starts. Then using a warm towel, wrap the thermistor ans see if it stops. Watch the display to see if it is registering the changes in temp. I suspect a bad thermistor.

Posted on Jan 05, 2009

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