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

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Rinnai Energysaver 403 FT

We have owned our new home for a year and a half. The heater starts okay but then the lights start flashing and E:20 shows and the heater stops working. Its very frustrating as this is our only source of heat at the moment.

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  • asianplum371 Jul 19, 2008

    Same model heater 403 FT lights then runs for minute and shuts itself down displaying same message, second or third time i restart heater it stay alight but that display message and noisy fan sound bothers me



  • Anonymous Apr 24, 2009

    Having the same issue - my Rinaai will shut dfown if I have the settings on low - lights showing that the filter needs cleaning. Have cleaned the external filters and even taken the casing apart and vacumed out the dust. Rinnai have stated that I need to take the heater to a service centre - a college has suggested the gas jets may need cleaning. I'll try that first before paying for the service.

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Check the Air Filter, if it needs cleaning the light will flash to notify you on some models.

Posted on Dec 18, 2008

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I may not be much help here in the states but if you have the owners manual you will find a page that will tell you what the error code represents. Not knowing and unable to find the NZ error codes, most likely it represents a flame failure. You will need to remove the front cover and inspect the flame as it starts. If it starts and goes out quickly, you may have debris attached to the flame rod not allowing it to get the proper signal. Or you may have a spider web in your burner. These units are not eazy to repair and I strongly suggest you call a proffessional. Sorry.

Posted on Sep 15, 2008

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This is a New Zealand model. There is no pilot to relight, the unit will cycle again when you stop and restart the unit. You will need to find out why you are getting this code. I would check out the venting system for blockage. Make sure you are getting gas. You may want to take off the front panel and look into two small rectangular holes covered by small metal plates to see if, in fact the flame is starting then stopping. I have seen many of these with spider webs inside the gas train and burners not allowing the heater to start.

If you can get to the backside of the heater, you will see a rubber hose about 1" (US) in diameter. Remove it from the vent and see if the unit ignites. If it does, this indicates blockage in the outer vent passage.

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