My American Heat ADK-1 is not heating the water. How do I troubleshoot this?

Warranty? Installer? MFG website? try their customer service email Owner's manual troubleshooting? no manual? try
manualslib.com

Phone 1-800 999 9515. Fax 1- 800 999 5210. If you Google American tank less hot water systems. you will find a place to order parts.

Copy following link to help identify water heater.
http://waterheatertimer.org/How-to-fix-water-heater.html
Add a comment and describe water heater in detail. Attach video with clear description.
If unit has blinking lights, then check product manual for error codes from blinking lights.
If unit is delivering no hot water, check for cross connections
http://waterheatertimer.org/Crossover.html
Call service technician and catch up on routine maintenance, such as cleaning water filter, etc

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

1) Copy following links for whirlpool energy smart resources:
http://waterheatertimer.org/pdf/Energy-Smart-troubleshooting-guide.pdf
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html

2) Control box is probably bad.
There are 2 types of control boxes for older-style energy smart water heaters.
You will need model number and serial number from label on side of tank to order from Whirlpool.

3) This older-type energy smart water heater is probably discontinued by AO-Smith, American, State, Craftmaster, Reliance water heater group that makes Whirlpool and Kenmore water heaters.
New generation energy smart offers interface with home automation and/or non-existent smart grid.
Older energy smart only offered potential interface with non-existent smart grid.

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

You want wiring diagram? With recommended wire size?
This particular water heater is direct-wired into a wall box, and appears to be 240Volt 6500 watts. Connect water heater to 40 amp breaker and 8 gauge wire.
Look at nameplate on device for amp and wattage rating to confirm exact power requirement.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Or a general part illustration?
http://waterheatertimer.org/images/American-ADK-3-parts.jpg

Contact American Heat. 888-818-4328
Their support button and link to product manuals and literature seems rather null date 10-14-12 which could indicate a company in transition.
There is email form
http://americanheatus.com/index.php/contacts/

American Heat is NOT same company as American water heater company.

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

You want wiring diagram? With recommended wire size?

This particular water heater has a factory-pigtail, and is direct-wired into octogon box, and appears to be 240Volt 6500 watts. Connect water heater to 40 amp breaker and 8 gauge wire.

Here is illustration:
http://waterheatertimer.org/images/Main-subpanel-Tankless-4a-8.jpg

Look at nameplate on device for amp and wattage rating to confirm exact power requirement.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

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

If you live in an area where you have hard water it can destroy pretty much any tankless water heater, but it seems that you may have another problem, I speak to them on a regular basis and everyone there seems to speak English and Spanish, its very important to make sure that this unit is installed by a liscensed person, whom will check your wire gauge, and breaker size, if you use 240v this unit can draw upto 66 amps, so its important to have an electrician size your heater for the correct voltage.

You must to make sure that you have not used too much teflon tape, and also that the flow sensor is still inside the inlet pipe. For example these units some with a reed switch type flow mechanisim which when flow is detected it opens the door for the electricity to pass through the unit. so no Flow no power, or in your case there maybe something clogged, or your flow sensor is not inside the inlet pipe, also if this unit has been installed previously and had been working for sometime now, then check on the inside pipe behind the screen you will notice there is a small black or either white bullet style flow switch, if this flow switch is stuck on the inside of the unit, this is your problem, if not its a reed switch, you can call 1-888-818-4328 and ask for an ADK reed switch see picture attached

You need to get a real tankless water heater, I had one of this brand and what a waste of money, when you call the company they do not speak very good English and if you talk to Richard whom is supposedly the VP he is as dumb as a mule.

no the tub faucet is the only faucet that is wide open you might have to not run full blast on the faucet , your tankless water heater is under sized for the application, to many gallons per min going thru the unit, look at the rating chart for your unit, the r94 is only 9.4 gallons per min, and a tub faucet can be upto 5 gallons per min, depending on the faucet,,