Question about Rinnai RHFE-556WTA Direct Vent Heater NG Air Conditioner

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I have a Rinnai Energysaver 556F

It worked great last year, now this year you turn it on set the temp that you want it works it heats up blows warm air, but then stops after a cycle like 5 min. All of the light in the temp setting and the on button are blinking. If you turn it off then on again, it will do it again?

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The heater will have some error codes stored in it. To retrieve them get an assistant to write down the codes as you see them. They come quickly. OK to get the codes, push down on the Economy button and the up arrow and down arrow at the same time. Hold for three seconds. It will take three fingers to do this. Once you get the error codes, look in your owners manual to diagnose.

Posted on Feb 20, 2009

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Posted on Jan 02, 2017

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I have a rinnai energysaver 556f heater and the "On" buttons keeps flashing and it feels like it's blowing cold air. The "LO" button keeps flashing as well. What does this mean?


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My tank says I have 32 gallons left but the heater won't work (rinnai 556f). It turns on for about 15 seconds and the light on the power button turns red and starts blinking. What does this mean?


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Raise the thermistor. It is a black rubber probe located on the back of the heater close to the coldest spot in your home, the floor. Raise it a few inches. To do this you will need to unhook it from its holder and open the front of the heater to unravel the extra length of yellow wire.

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Rinnai EnergySaver 556F Heater flashes


I'm picking up a faint propane scent when the heater is completely turned off. When I turn the heater on it lights fine so I don't suspect it's the pilot light. Is this an issue with the installation of the fuel line, or could it still be the pilot? Any ideas on troubleshooting the source?

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Rinnai 556F stuck on Low and will not produce heat


The Low code indicates that the heater did not start because of lack of gas or that the flame rod did not sense enough heat. Make sure all gas valves are on and if you use propane gas, that it has gas in the tank.

Assuming all gas is on, you will need to remove the front cover by first pulling off the very bottom trim piece. This is located below the louvers and by grasping both left and right sides of this trim, pull toward you. It is just held in place by little clips. Now taking a very new #2 Philips head screwdriver, remove 2 screws found on the extreme left louvered section of the front. Then 2 more on the extreme right. Two more near the center of the louvers. Now I think there are two more holding the bottom in. Gently move back and forth the front panel starting at the bottom and work out the clips at the top just below the instrument area. Be careful to not break any of the clips at the top. With the front off, at about the 5 o'clock position you will see a very small round hole with glass over it. Start the heater and look to see if it ignites and stays on for a second or two. If it does but goes out very quickly, you may have a corroded flame sensor. The flame sensor is located by looking into the small hole and up to the 11 o'clock position. All it is is a probe that sticks down. The only way to get to it is by removing the small window section of the heater and use a wire brush used to clean a gun and brush it. Or very gently take a thin but long regular screwdriver and scrape off the probe. Be careful not to damage the fragile white gasket when taking off the sight port.

If the heater never started, you have a restriction in the gas train. Typically I find that spiders make a nest inside the gas burner because the bugs they eat likes the gas smell. The only way to get to their web is to remove the burner from the unit and clean it. This is not an easy part to remove and suggest you call a technician.

Good Luck!

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