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  1. #1
    Setting Up Camp
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    Furrion tankless water heater E5 error (fix)

    Want to share an issue I had with the Furrion Tankless water heater and how it was resolved.
    It's been working well and then out of the blue, when turning on the hot water the control panel would beep and display E5. So, no hot water.

    It turns out this was right after a major rain storm.

    The solution I found is in the pictures: All you need is a philip head screwdriver.

    Click image for larger version. 

Name:	water_heater1.jpg 
Views:	177 
Size:	97.6 KB 
ID:	38467

    Click image for larger version. 

Name:	close_up1.jpg 
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    Remove the 2 screws, pull out the Exhaust Pressure Switch and disconnect the hose on the back side. Blow it out. Reassemble.
    Moisture gets in somehow and blowing out the tube fixed it.
    Hope this helps someone else. It took me a few days of searching and reaching out to a few people that had the same issues.
    Also, if anyone knows the name of that component? I can add it. (added above)
    Last edited by Riveyman; 01-13-2022 at 05:28 AM. Reason: added name of part
    2022 Reflection 340rds
    Full time, 9/2021

  2. #2
    Long Hauler
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    Quote Originally Posted by Riveyman View Post
    Want to share an issue I had with the Furrion Tankless water heater and how it was resolved.
    It's been working well and then out of the blue, when turning on the hot water the control panel would beep and display E5. So, no hot water.

    It turns out this was right after a major rain storm.

    The solution I found is in the pictures: All you need is a philip head screwdriver.

    Click image for larger version. 

Name:	water_heater1.jpg 
Views:	177 
Size:	97.6 KB 
ID:	38467

    Click image for larger version. 

Name:	close_up1.jpg 
Views:	163 
Size:	81.4 KB 
ID:	38469

    Remove the 2 screws, pull out and disconnect the hose on back side. Blow it out. Reassemble.
    Moisture gets in somehow and blowing out the tube fixed it.
    Hope this helps someone else. It took me a few days of searching and reaching out to a few people that had the same issues.
    Also, if anyone knows the name of that component? I can add it.
    Great sleuthing job! Thanks for posting the fix here for others!

    Sent from my SM-N986U using Tapatalk
    Mark & Mary. Full-timing across the USA (and Canada)!
    Current Coach: 2021 Grand Design Reflection 320MKS
    Current Rig: 2019 Ford F350 SD Crew Cab, w/8' box, Lariat, SRW, 6.7l Diesel

  3. #3
    Big Traveler
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    Draft inducer maybe?

    Our lake house Amana furnace had a similar issue where the furnace draft inducer had built up humidity/moisture in it over time from bugs clogging up the drain line. Actually could hear water sloshing when the furnace tried to start but couldnt because of the low pressure. Had to drain and blow out some debris as well and walla... its worked ever since.
    Jim and Annette
    2019 Reflection 150 295RL
    US Army Veteran
    Missouri (AKA Misery)

  4. #4
    Seasoned Camper
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    I had that same issue last summer. It was after a terrible storm that pummeled that side. Kept getting same error. Tried for better part of a day to determine the cause. It so happened the sun was heating up that side pretty good. At one point I pulled that same piece and played on the hot asphalt. When I gave up and reassembled it worked perfectly. And has since. Now I know.

    Thanks
    2022 337RLS & 2017 CTD Ram long bed
    720w of solar & Victron MPPT/battery monitors
    4x100AHr LiPo batteries & 2500w PSW
    Lots of other mods too....

  5. #5
    Site Sponsor Casa_Woody's Avatar
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    Parts list for the Furrion Tankless Water Heater

    Quote Originally Posted by Riveyman View Post
    Also, if anyone knows the name of that component? I can add it.
    The attached PDF provides an exploded view of the Furrion Tankless Water Heater, with referance part numbers. The sensor in question appears to item No.8. Exhaust Pressure Switch.

    Click image for larger version. 

Name:	FWH09A FWH09EA-PS.OEM Water Heater.pdf 
Views:	94 
Size:	345.3 KB 
ID:	38478

    Note: Not all parts listed are orderable. I confirmed this with Furrion.
    Last edited by Casa_Woody; 01-12-2022 at 10:30 PM. Reason: More Info
    Ken & Tammy
    Union Valley, TX
    2021 GD Reflection 303RLS 5th Wheel
    2019 Ram 2500 6.7L Cummins 4x4

  6. #6
    Setting Up Camp
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    Thanks Casa for the information! I updated my original post to add the name!
    2022 Reflection 340rds
    Full time, 9/2021

  7. #7
    New Member
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    Saved my weekend, THANK YOU!

    Quote Originally Posted by Riveyman View Post
    Want to share an issue I had with the Furrion Tankless water heater and how it was resolved.
    It's been working well and then out of the blue, when turning on the hot water the control panel would beep and display E5. So, no hot water.

    It turns out this was right after a major rain storm.

    The solution I found is in the pictures: All you need is a philip head screwdriver.

    Click image for larger version. 

Name:	water_heater1.jpg 
Views:	177 
Size:	97.6 KB 
ID:	38467

    Click image for larger version. 

Name:	close_up1.jpg 
Views:	163 
Size:	81.4 KB 
ID:	38469

    Remove the 2 screws, pull out the Exhaust Pressure Switch and disconnect the hose on the back side. Blow it out. Reassemble.
    Moisture gets in somehow and blowing out the tube fixed it.
    Hope this helps someone else. It took me a few days of searching and reaching out to a few people that had the same issues.
    Also, if anyone knows the name of that component? I can add it. (added above)
    Exact same problem, Reflection 312bhts. Thank you SO MUCH for sharing this, you saved my weekend.

  8. #8
    Left The Driveway
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    Thank you so very much for sharing your experience. Just as you described, our tankless water heater showed the dreaded E5 error as a storm raged outside the trailer. My intrepid husband was able to use the fix you gave so well and we again have hot water!

  9. #9
    Left The Driveway
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    Thank you so much. Giant storm here last night. We had Error code 5.
    Your solution worked great.

  10. #10
    New Member
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    Dear Riveyman,

    Same thing just happened to me after a heavy rain. Glad I found your post. Your fix worked.

    Happened again overnight. Not raining hard and not any wind to speak of. Blew the line out again.

    I'm not an engineer, but I have slept at a Holiday Inn Express. This appears to be a design flaw. Water should not get in. If this was a common occurrence you'd think Furrion would outline this fix in their manual.

    My TT is new and still under warranty. I've contacted Furrion and my dealer. I wonder what will be their response?

    2022 Reflection 315RLTS.

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