Figured I might could get some help/advice here. I’ve got a Rinnai RL75eN that I have recently started having some issues with.

It seems that only my shower in my master bath doesn’t get hot water. When I turn it on, the light on the controller doesn’t come on and I get no hot water. I’ve figured out that having the hot water tap on the sink makes it come on and I usually run it with my shower to get hot water. I’m guessing/hoping that my shower doesn’t have a high enough flow rate to make the heater kick on? Any have any experience with this?

Update: Removed the little blue flow restrictor from the shower head and man, the pressure I never knew I had. Fixed my problem. Thanks guys!

This post was edited on 1/13/20 at 10:11 pm

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Posted by Art Vandelay

LOUISIANA

Member since Sep 2005

10691 posts

Posted on 1/13/20 at 9:41 am to tap011

I think mine did the same at my old house. It is probably flow rate. You do need to clean those tankless heaters. There is a flush you can do to remove scale. Where are you located?

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Posted by countryboycansurvive

Rapides Parish, LA

Member since Oct 2017

107 posts

Posted on 1/13/20 at 9:52 am to tap011

Does your shower faucet have only one handle or 2 knobs?

Mine has the one handle and if mine gets to where no hot water is coming to the shower, then I can change out the cartridge in the faucet and I get hot water again. Something about the faucet cartridge getting stopped up.

I have the tankless hot water heater also.

This post was edited on 1/13/20 at 9:54 am

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Posted by NASA_ISS_Tiger

Huntsville, Al via Sulphur, LA

Member since Sep 2005

7975 posts

Posted on 1/13/20 at 10:07 am to tap011

Does your shower head have one of those flow-rate restrictors in it? I had to remove one at my mom's old house to get the flow rate right for that system. It was an optional piece (for eco-friendly homes).

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Posted by Bedhog

Denham Springs

Member since Apr 2019

3741 posts

Posted on 1/13/20 at 10:22 am to NASA_ISS_Tiger

quote:
Does your shower head have one of those flow-rate restrictors in it?

was my first thought. OP, Did this just start happening or has it always done this since the instillation?

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Posted by tap011

Louisiana

Member since Oct 2013

771 posts

Posted on 1/13/20 at 10:26 am to Bedhog

I’ve been in the house since April. Only recall this happening in the last 2-3 months. Single knob shower. Located in NWLA.

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Posted by tap011

Louisiana

Member since Oct 2013

771 posts

Posted on 1/13/20 at 10:29 am to NASA_ISS_Tiger

Going to check when I get home and see about the flow restrictor. I took the shower head off a while back to make sure the screen wasn’t clogged up but didn’t see any issues.

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Posted by NASA_ISS_Tiger

Huntsville, Al via Sulphur, LA

Member since Sep 2005

7975 posts

Posted on 1/14/20 at 7:46 am to tap011

Be careful...might feel like it'll take off your skin. I know the first time I felt it....I was like WOW.

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Posted by UltimaParadox

Huntsville

Member since Nov 2008

40826 posts

Posted on 1/14/20 at 10:29 am to Art Vandelay

quote:
You do need to clean those tankless heaters. There is a flush you can do to remove scale.

If it wasn't doing it before, and fixing the flow rate fixed it....

If you have had it over a year, definitely look into flushing it. It is really simple, just 45 minutes with straight vinegar

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