My Jacuzzi J-N180F tankless water heater will not even light.

Follow the link, you need to "Descale" the heater. Tankless Water Heater DeScaling How To Flush

The error 11 indicates that the burner did not ignite the incoming gas properly. Make sure that the gas valve is open (at the water heater and the meter/tank, depending on the type of gas). If you have propane, check that the tank isn't empty. Make sure that the water heater is properly grounded.

The other causes for the error may require a professional to check them out. Check that the water heater is compatible with your incoming gas. (Propane burners do not work with natural gas and the reverse is true, as well.) Check that the gas pressure available is high enough for the unit. (Tankless water heaters often need larger diameter pipes to bring in the gas than their tanked predecessors.) Check that there is no air in your gas lines. Make sure that the condensation collar was correctly installed on the water heater and that the vent pipe isn't too long. There are some DIP switches that need to be set depending on the installation; make sure that all of these are in the correct positions. Next the burner, the igniter and the solenoid gas valve need to be checked. The wiring for the igniter and the valve need to be checked. The burner cover has to be removed to check if the burners are properly seated. The burner plate has to be removed so that the burner surface can be checked for debris or condensation. The igniter has to be checked to see if it is operational. Finally, the solenoid valve needs to be checked for a short or an open circuit.

I hope this helps.

Cindy Wells
(I've also had to check the end of the vent pipes for blockages - animal nests in the summer or ice in the winter.)

Tankless promotion is certainly slick and inviting...

-Tankless gas save about $100 per year vrs pre-april-2015 gas water heater for 'average family of 4.'
-New energy standards will reduce the expected savings to $70/ per year.

-Tankless electric cost about $100 more per year to operate than ordinary electric water heater for 'average family of 4'

-Do-it-yourself repairs are generally not possible with tankless.
-Tankless gas require larger vent and larger gas line, and a condensate drain.
-Whole-house Tankless electric will probably require a new electric service panel
-Tankless require yearly deliming/ descaling of heat exchanger... and heat exchanger will lose efficiency over time because of scale... even if unit is delimed each year.
-Electronic controls are vulnerable to surge
-Only the alloy heat exchanger has long-term warranty, but otherwise the warranty is same as typical tank heater
-Tankless cannot be exposed to more than 11 grains hard water or parts can fail within 2-3 years
-Tankless might not be able to keep up with higher temperature setting needed to fill very large tub (or any bathtub) if incoming water is too cold due to winter conditions. Etc.

Example Rheem tankless resource:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pro-n-con-for-tankless-water-heater.html

Example installation for tankless electric
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Gene


Water Heater Timers Save Money

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

My Navien is doing the same thing, and it's 6 days old. The older unit did the same thing as well... I'm guessing it has nothing to do with the unit, and something to do with the line... I'd love to get to the bottom of it as well.. :(

What is the problem you afe having with your Jacuzzi Water Heater?
Is this a Jacuzzi Hot Tub?-- Do you have some indicator lights on?-- what color are the lights?--
Is the Circulating pump running water thru the heater element?
Tell me more!-- Let's walk thru the system, and figure it out-- Mack B

For my Jacuzzi tankless water heater model #J-SN180F: It turned out to be an exhaust issue. If I take off the exhaust vent completely then the talks heater works with 3 baths at full hot water. I get the error code 12 again as soon as I put event an elbow of the vent. So my conclusion is I need some sort of straight vent.

You might have crossover problem caused by bad faucet cartridge.
http://waterheatertimer.org/Crossover.html

The green standby light should come on when 240Volt power is applied. Page 6 manual.
Both red lights should come on when tankless is activated. Page 6 manual

RTE 13 requires 60 amp breaker and 6 gauge wire
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html
http://waterheatertimer.org/pdf/Rheem-TanklessElectricUC_AP15447.pdf

Factory temperature setting is usually default 120 degrees.
Adjust temps page 11 manual
Thermostat calibration is always approximate.
120 degrees is not hot enough to burn the skin.
Exceptionally cold incoming water temperature can cause tankless not to heat enough hot water: install tempering tank to preheat water to room temperature.
Tankless cannot be exposed to more than 11 grains hardness in water. Delime tankless yearly, clean water filter monthly, do not install low-flow restrictions or conserve water since the flow rate must remain high for tankless to activate.
Rheem does not post service manuals for their tankless water heaters.
Call Rheem 800 432-8373

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

Before calling service technician, open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Bosch_E1_troubleshooting.pdf
http://www.bosch-climate.us/bosch-hot-water/aquastar-service-bulletins/
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/Crossover.html

Before installing tankless water heater, read the service manuals and product manual to make sure you have testing skills and equipment needed to repair tankless gas water heater, and that you are prepared to buy expensive parts when needed and do the recommended yearly and monthly maintenance as outlined in manual.
Also check that area has qualified service technician, and that person carries parts on-hand, and is certified for your model number. Keep Tankless manufacturer contact information on-hand, and be skeptical of promises of unlimited hot water, and effortless long-lasting water heating, and saving money. The only folks saying this are the folks selling the product, and not their customers.

Fix most tankless gas water heaters yourself, same day, all brads for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

You could fill with hot water first then add cold to your temp request.The thing to do would of been to buy the tub with its own heater

Hi,
No you cannot safely increase the output of a tankless water heater. The alternatives would be to install a heater in your Jacuzzi or to add a tank type water heater to hold water for the tub and then run the haot water from the tankles into the tank. This way all the tank is doing is holding water for you to use and not heating it. Kinda defeats one of the purposes of having a tankles though.
Only other option would be to exchange the tankles for a higher ouput one. Also an exspensive option.

heatman101