**Please Refer to the Technical Information Page For Important Information Involving The Operation of Hot Water Heaters**


I have no hot water. How do I know if the Aqua Smart® has failed?

To make a determination as to why there is no hot water, you will have to perform a series of diagnostic tests ON THE WATER HEATER FIRST to determine the problem. Follow the steps below to start these tests.

1. First, go to the main power panel to be sure the circuit breaker to the water heater has not “tripped” off.

If that is not the problem, then return to the water heater to perform further tests.


As with other electrical devices, sometimes removing the power source from the device will reset the software and a problem may resolve itself with this simple operation.

2. Most water heaters have a RED reset button or hi-limit switch, ENERGY CUTOFF SWITCH (ECO) which can “trip” due to a power surge or power outage.

  • Press the reset button to see if that activates the water heater.
  • Check with a voltage meter to determine if power has been activated.

(If the water heater begins heating water, you may hear a sizzling sound coming from the water tank).

9879152 (1)

Red reset button or ‘high limit control’ or Energy Cut Off or ECO will cut off electric power to entire water heater. ECO shuts off both hot wires in the 240V circuit.

Diagram above: 240V arrives at L1 and L3 screws of upper thermostat. When ECO is tripped, L1 and L3 screws are hot but electricity stops there.

Push reset button firmly. If ECO resets and water heater turns ON and works, then watch over next few days if ECO reset trips again.

*This would be a good time to be sure that the “On-board” thermostats are set at 120 F degrees*

A final check with a voltage meter should be made.

3. If the water heater is still not working, then you need to determine if the  Aqua Smart® is the problem. Move the BY-PASS switch, on the Aqua Smart®

RECEIVER, from the AUTO position to the BY-PASS position. This allows the water heater to be powered directly from the power source.

(If the water heater begins heating water, you may hear a sizzling sound coming from the water tank).

If switching from AUTO to BY- PASS does not activate the water heater, then further testing must be done to determine the cause of the problem.

The problem may be with the THERMOSTATS or the HEATING ELEMENTS on the water heater, itself.

Using a circuit tester or multi-meter, check the incoming voltage to the thermostats/heating elements to determine if they are receiving electrical current. Remember, these components can and do fail.

If you are not familiar with testing electrical components, we STRONGLY recommend that you contact a qualified electrician to conduct a further diagnosis of your electric hot water heater or the Aqua Smart® receiver.

4. If you have the original Owner’s Manual, that came with the water heater, there are a series of diagnostic steps that are usually outlined in the manual to       determine the cause of a water heater failure. You should follow those steps to determine the problem.

5. Presuming that the Aqua Smart® was not the cause of “no hot water” you may find it necessary to contact an electrician or plumber to remedy the water  heater problem.

Every once in a while the TRANSMITTER screen displays the danger triangle. What causes this?

There can be several reasons for this to occur and the best way to troubleshoot this problem is to do the following:

1. First check the batteries in the TRANSMITTER to be sure they are at full power. There is a low battery warning icon and an audible “beeping” sound, in the TRANSMITTER, alerting the homeowner when the batteries need replacement.

However, over time and with use, any battery’s power can decrease and this may be the case thereby reducing the operating distance of the TRANSMITTER. Replace the batteries to see if this remedies the problem.

2. Remove the TRANSMITTER from the wall, where it has been installed, and begin testing within 3 feet from the RECEIVER mounted on the water heater.

*Pressing the SET button will “override” the 30 minute communication delay built into the TRANSMITTER, a feature to preserve battery power.*

If the temperature digits appear in the SENSOR TEMP window on the TRANSMITTER, communication has been restored and the problem may have been resolved.

3. Be sure that the LED’s on the RECEIVER are working by changing the MODES on the TRANSMITTER. If the LEDs illuminate on the RECEIVER and you hear a  clicking sound, then the TRANSMITTER and AQUA SMART® RECEIVER are communicating.

4. Now take the TRANSMITTER back to the location where you it was first installed. See if it operates as it did originally. You may have resolved the problem.

5. The operating distance of the radio frequency (RF) signals can be shortened when there is increased “electrical noise” or interference  caused by computers, routers, metal beams/metal studs and even some appliances that generate RF noise. Check to see if any of these components have been installed in the same operating pathway that the Aqua Smart® may be using. Should this be the case, you may have to move the TRANSMITTER closer to the water heater for reliable RF operation.