Question about Rinnai EnergySaver 556 Air Conditioner

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Rinnai 556F stuck on Low and will not produce heat

My Rinnai 556F unit has worked great for several years to heat a finished attic space, but when we turned it on the other day as the weather turned cold, we encountered a problem. The room that has the unit is presently at about 60 degrees. When we turned the unit on and set the temperature to 72, the fan started running, but the heat never turned on and the "Low" light lit while the On light flashed red. Each time we turn the unit on, we get the same results. An clues?

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Re: 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!

Posted on Nov 04, 2007

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