Question about Noritz Water Heaters

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No power on unit/Remote Controller

Replaced circuit board. The voltage across the blue/white reads about 100VAC and the voltage across the black/white also reads about 100VAC. Theres voltage on both sides of gfi. No readings the remote terminals. Help!!!

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Try leaving the remote unplugged and unplug the unit for 10 seconds and plug only the unit back in. If you get hot water without the remote connected but nothing after doing the same thing with the remote connected then your remote may have shorted out. Otherwise your circuit board may have had a short. In which case, call Noritz for a replacement.

Posted on Dec 14, 2013

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Posted on Jan 02, 2017

gary1121
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SOURCE: Rinnai *85e remote hooked up no hot water and no reading on remot

did you turn the unit off before hooking it up ? Any function on a tankless rennai the pwer has to be turned off and the priority button has to be pushed in,, if you have the manuel it tells you haw to do this,,

Posted on Jun 06, 2009

Dplumber
  • 119 Answers

SOURCE: Not sure if my first try worked so will try again.

The easiest thing to do would be to call Bosch and just ask for a new heater for free. The other option is to call Bosch and have them send you all new elements. If there is power, there should be heat of some kind.

Posted on Sep 14, 2010

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SOURCE: Water heater timer not working or bad wiring?

10/15/2012
Hi Liz.
This is a live answer. And you can add a comment after trying following step, and I will comment back..
Replace battery, and then reset the timer using reset button located to left of display screen.
http://waterheatertimer.org/pdf/eh40-english.pdf

Posted on Oct 15, 2012

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I'd first try cutting electricity to the unit and then powering it back up; however, there's a good chance you unit was damaged from a voltage surge following the power return. If you have a volt meter, here are a few things to check:
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There is a GFI on the bottom right hand corner of the heater. It is a black box with 5 wires on the bottom in this order: blue, white, green ground, black, and white. The voltage across the blue/white should be about 100VAC and the voltage across the black/white should also be 100VAC. If the black/white isn't registering any voltage, the gfi is tripped.

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Contact Paloma/Rheem customer (800-432-8373) support and notify them IF you are getting a code "76" error. Rheem has recently extended the warranty on the "Burner Control Assm."; which is your problem. The C4-C8 portion of the error code, is where the unit stops the ignition process...burner fails to light, or gives you intermittent hot water. In either case, contact customer support2.gif.

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I had the same problem with my Noritz 751M, I called the plumber and after he talked with Noritz and ran a bunch of tests (for $150) he told me I needed a new unit ($4,000 installed). They implied it was my fault cause I never flushed it over 8 years. They were unable to tell me the flow rate though (which should be very low if scale was my main issue). I decided to take over as I am very handy and an engineer. Here is what I found:

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4. I got mine to successfully start by loosening the ignitor rod PN 101 and jiggling it while still inserted into the combustion chamber (holding it with insulated pliers while still against the case) - somewhat dangerous and startling when after sparking the gas flows and flaming starts but not too bad.


5. BOTTOMLINE: I got it working but it would not "always" light (even though my flow was always >0.5 GPM). Noritz told me that it is probably because I have the older black ignitor (PN 126 = EHEJ003). They have a new and improved gray ignitor (PN 126 = EMUJ004). I ordered it with a couple of other ignitor parts for a total of $35. I just installed them and they work great - ignition all the time from every faucet.


6. ENDGAME: Order the new ignitor parts, verify your flow rates using the field manual. See the pics below for some insight. I spent 20 hrs troubleshooting and wanted o share. If you want more info just email me at: tmorganjets@gmail.com

You can monitor the flow rate and flame by doing a skype (PC at faucet to Phone place in front of Noritz) - you will be able to see the Noritz turning on (with flow rate displayed) each time you turn on a faucet - it is very helpful for troubleshooting and verification
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