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

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Rinnai 1004 fa not lighting

a code witch reads 99 apears and it tells you to check for blocked exhaust, i have the unit off the wall on a bench with no exhaust on it and it does the same thing
any idea?

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Re: rinnai 1004 fa not lighting

This heater needs some back pressure on the exhaust to work so while it is on your bench, take the reducing coupling found on your vent system and put it on the exhaust pipe to restrict the outlet size. Now cycle the heater with the front cover off and with both of the small rectangle viewing ports off so you can see the flame. The heater fan will start to turn closing the contacts on that little square pressure switch. If it does not close you will get this error code. Make sure the small hoses are attached to the switch and the exhaust system. If you hear some clicking going on at the gas valve you can assume that the pressure switch is closing. The gas valve will energize and send gas to the burner. Look for flame. There is a small probe that will sence flame within a few seconds and keep the unit on. If it doesn't, it will turn the unit off within 3-5 seconds. I suspect that a spider has set up shop somewhere within the heater and either restricting the flow of air to the pressure switch, the burner or you may have a bad pressure switch. If you need a switch, I can send you one for $15. Contact me at "".

Posted on Oct 26, 2007

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Re: rinnai 1004 fa not lighting

I spoke with tech support this morning. Some new units are shipped with two tubes disconnected from the exhaust port. Tubes are found in the back on the right side as you face the front of the unit. Black tube should be connected to BK connection, the clear tube to the other.

Posted on Jan 07, 2008

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My Rinnai 1004F giving me error code 99

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