My Noritz N-084M-NG residential/commercial indoor/outdoor Hot Water Heater does not heat the water when I get up in the morning. I have to go and switch it on and off again to get it to heat the water. it was purchased in 3/06 but not hooked up until 07. There is power in the water heater itself. It has a circulating pump connected to it. any ideas what is wrong? thanks sharrie

Water filter in tankless is usually located when cold water enters unit... and should be removeable for cleaning once a month

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You probably need commercial 150gallon gas water heater.
Or three 80 gallon tanks, depending on number of people.

80 gallon residential gas heater is rated for low-demand 6-8 person household.
80 gallon residential electric is rated for low-demand 5 person household

80 gallon is not correct for 14-28 people in 7 apartments
http://waterheatertimer.org/Whatsize2.html
http://waterheatertimer.org/Two-water-heaters.html

Call local plumber, or local code department.

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1) You want simultaneous operation.
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html#simultaneous

2) Installation REQUIRES bigger circuit breaker and bigger wire.
Or 2 circuit breakers and 2 wires
Or change both elements to 2000 watt.
http://waterheatertimer.org/Color-codewire.html

3) MUST add ECO-protected thermostat to lower part of tank.

4) Warranty will be void.

5) If tank is rusted, the added heat and expansion could hasten rupture.
http://waterheatertimer.org/Replace-anode-rod.html

6) As general rule, the health department will not allow this tank conversion for restaurant code to meet dish washing consumption unless manufacturer certifies tank.
But manufacturer will not certify ordinary residential water heater for commercial simultaneous application. Commercial simultaneous tanks can cost 2-4 thousand so they can meet restaurant code and deliver sustained high temperatures for washing dishes.

6) Also consider Hatco booster heater for commercial dish washing.
This type heater has 2 sets of non-simultaneous elements to heat large tank of hot water.

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Replace single-handled faucet cartridge, and see if hot flows to that faucet again.
http://waterheatertimer.org/Crossover.html

Exposing tankless to hard water causes reduced efficiency within a few months, and can cause Total failure of parts within two years.
Do not expose tankless to more than 11 grains hard water.
Here is research pdf conducted by water softener industry comparing tankless andf tank-type:
http://waterheatertimer.org/pdf/Battelle_Final_Report.pdf

To possibly solve problem temporarily, install softening system, delime tankless unit using white vinegar. Delime yearly. It is fun for whole family. And who doesn't like a project schedule.
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

To solve problem long-long term, install tank-type gas water heater from local box store for $350.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The NC250 (N-0931M) Series ASME Tankless Water Heater is a commercial grade water heater and many people install the vent wrong. PVC CANNOT be used for venting. The NC250-DV-ASME is for indoor use only. Improper venting will cause the symptom you describe.

There's a field conversion kit available. Contact Noritz to get more information.

you need to recirculate cleaner through the unit for the lime build up.

it sounds like you have issues with scale building up in your heater. I would recommend performing a descale to remove scale deposits. Sometimes the scale blocks water flow through the heat excahanger; you may need to have a servicer dig the scale out of your main servo and mixing cylinder before performing a descale.

Three flashes typically indicates the unit is overheating due to scale. I'd try a descale initially and see if that remedies the problem.

Hi,
Have you tried to turn to temperature up higher? The units come factor set at a low water temperature and usually need to be adjusted higher after installation.

Down load this manual and follow the instructions on pages 11 or 12 depending on whether or not you have a remote control. My gues is that you do not have the remote.

http://www.noritz.com/u/products_files/owner_s_guide__n_0531s_0631s_series.pdf

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101