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

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Rinnai 431wt filter light won't go out

I cleaned filter and vaccuumed out everywhere I could think of and dirty filter light won't go out. Heater still seems to work okay other than that.

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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

Posted on Feb 08, 2009

  • Cindy Greene
    Cindy Greene Jan 12, 2017

    Same exact thing happened to me. Everything is clean inside and out. We unplugged it for 24 hours. Plugged it back in just now. It ran for 10 minutes and the filter light beeped and keeps blinking again!

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If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


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After it has been on for a while the filter light start flashing. Tell you tell me why please. It has just been serviced.


Ben, just because the heater was recently service, doesn't mean the filter may have gotten dirty from use, since then. Or the filter was overlooked during servicing.

In either case, turn the electrical part of the heater OFF and unplug it from the wall receptacle. Remove the filter and clean it, if necessary. Reinstall the filter properly, plug the unit back in and turn the Master ON/OFF switch to ON. Start the heater and the Filter Clean Light should not glow.

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