Rinnai RHFE 556FTR convection fan fails to run after shutdown to dissipate heat. This results in a false high room temperature reading and the heater stays off too long

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??

Tom

Maintaining the lowest acceptable setting and leaving it at that temperature is the most economical way to run the unit. If the space is going to be unoccupied for an extended time (several hours), lower temperatures are okay. This minimizes the need to burst the heat to warm the space quicker. As I understand your unit, it minimizes electrical & gas consumption by basing the need on the temperature difference of actual space temperature and setpoint. The larger the gap, the more power and gas is consumed.
In summary, when the space is occupied, maintain a consistent temperature setting. When the space is unoccupied, maintain a lower setpoint.

Hope this helps. Good Luck. :-)

lower the tempature setting so the residual heat is the right temp your looking for

Sir,

Your heater is only a 21K BTU heater. It is not meant to heat a whole house. We don't know how big you house is, however a 21K heater will not heat 4 or 5 rooms. The best you could expect out of a Rinnai 556 would be to heat a couple of rooms that are next to each other. You will never be able to heat rooms in your house that have doors or are down the hall a ways.

Good luck,

Tom Hawkins
[email protected]

Hebert,

Is there a chance there is a draft around the room temp probe? It is down low on the right side of the heater. If there is a draft the room sensor is fooled and keeps running the unit. You should be able to prove the room sensor by putting your hand over it after the stove has been running for a while. This should shut the stove down. If not there is a problem with the room sensor.

Tom Hawkins
[email protected]

#14 is the code for over heat. Clean the circulating fan and blower blades. If there is anything on the top of the heater it need to go. Check the sides to make sure nothing is obstructing the air entering the back of the unit.

Tom Hawkins
[email protected]

If you have the economy button on turn it off. If there is a draft around the room sensor it will read much lower than the room. That should make the heater run wide open all the time however. Make sure the screens and fan blades are spotless. When it is 4 degrees outside your heater may be working very hard to try to heat the room.

Stay warm,
Tom Hawkins
[email protected]

Here is the user manual Energysaver RHFE-556FTR

Here is also the repair manual RHFE-556 FTR RHFE-556 FM RHFE-431 FT

the unit runs all the time because of the fan (ventilation motor)-but it is not working on cooling or heating all the time - The ventilation motor pushes the air from the room through the machine and when the termostat is reading that you set it up for cooler air or warm air it will turn on the air conditioning part or the heating part of the machine-it is very good system actually

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.