Energy Cutout (ECO) Switch Troubleshooting

ECO Function and Troubleshooting:

Checking the ECO:

An energy cutout (ECO) switch is installed on this water heater to shut down the water heating means in the event of a malfunction. If the upper tank temperature reaches 190°F. the ECO contacts will open breaking the L1 and L2 legs that feed the upper heating elements. The ECO also interrupts power to the compressor control relay, which in turn shuts off power to the compressor. Some models will not have a compressor relay in which case the compressor will be controlled directly by the ECO. Refer to the wiring diagram located on the control box cover to see if a given unit is equipped with a compressor control relay.

If the ECO has tripped, it must be manually reset as follows below.

1.Shut off power to the unit at the breaker/fuse panel prior to servicing the unit.

2.Gain access to the ECO located in the upper element compartmant, above the element.

3.Remove the black wire from terminal number one (1) and the white wire from terminal number three (3) on the ECO.

4.Using an Ohm meter or continuity tester, check pin 1 to pin 2; there should be continuity (very low resistance). If resistance is high or continuity checks bad, replace the ECO. Check pin 3 to 4, again there should be continuity. If not replace the ECO.

Resetting a tripped ECO:

1.Shut off power to the unit at the breaker/fuse panel prior to servicing the unit.

2.Gain access to the ECO located in the upper element compartment, above the element.

3.Check the temperature of the tank. In order to manually reset the ECO, the tank temperature must first drop below 120°F.

4.Press the red button located on the front of the ECO.

5.Apply power to the unit. Once the ECO has been reset, the fault on the user interface module should clear and the water heater should return to normal operation.

If resetting the ECO does not clear the error, the ECO will need to be checked. Follow the procedure below.

NOTE: Tank temperature must be less than 120°F in order to re-set ECO.

Investigate cause of ECO tripping:

It is very important to investigate why the ECO tripped as the control board may be faulty. Check the relays on the control board to determine if the contacts might be stuck closed; check the three relays listed in Table 3 by checking pin to pin resistances as noted. Resistance should be greater than 1 mega-Ohm (no continuity) between the pins as listed in the table. If the resistance between any of the pin combinations listed is less than 1 mega-Ohm, replace the control board.

TABLE 3

Relay Number

Load

Check Pins

RY 203

Upper Element

COM to NO (Top of Relay)

RY 205

Lower Element

CN206 pin 1 to 4

RY 207

Compressor

CN202 pin 1 to 2

25

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American Water Heater HPE10260H045DV manual Energy Cutout ECO Switch Troubleshooting, ECO Function and Troubleshooting
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