Installation Guide

DIAGNOSTIC CODE CHART ENERGY SMART® MODULE (ESM)
(ESM) ERROR CODE INDICATES CORRECTIVE ACTION*
No Error Code Displayed
Not Enough Hot Water
High usage, plumbing leak, operating mode
adjustment.
1. Check for plumbing leak.
2. Adjust temperature; see scald warnings on heater and in manual.
3. Override operating mode
4. Perform volume test.
No Error Code Displayed
Water Too Hot
Water temperature set too high or grounded
element.
1. Reduce temperature setting.
2. Contact a qualified person to test for ground element and replace if
necessary.
No Error Code Displayed
No Hot Water
No power, ESM or ET operation 1. Unplug and reconnect 9 pin connector.
2. If ESM still blank, disconnect ESM and check ET. See ET chart.
3. Contact a qualified person to verify correct voltage to unit.
E01 with an alert Icon flashing.
(also flashing red LED and beeper.)
Dry-fire, electrical power on with the tank not
completely full of water.
1. Turn off electrical power at breaker. Add water, open a hot water faucet
to bleed all air until water flows without air bursts.
2. Turn on electrical power at breaker.
3. See “Important Safety Information” on page 4.
E02 with an alert Icon flashing.
(also flashing red LED and beeper.)
Water temperature exceeded high limit. 1. Turn off electrical power at the breaker.
2. Press the reset button (see Figure 22).
3. Turn on electrical power at breaker.
4. If error returns contact a qualified technician to test for ground element.
Replace as needed.
5. If both elements test good, the qualified person should test lower
thermister.
6. If lower thermistor test good, replace ET.
E03 with an alert Icon flashing.
(also flashing red LED and beeper.)
Upper thermistor sensor failure.
(Note: Upper thermistor sensor is part of
the ET)
1. Turn off electrical power at the breaker.
2. Replace Electronic Thermostat (ET).
3. Turn on electrical power at breaker.
E04 with an alert Icon flashing.
(also flashing red LED and beeper.)
Upper element circuit failure.
(Note: Lower element is still operable)
1. Turn off electrical power at the breaker.
2. Check element circuits for resistance of 5-25 ohms (replace if required).
3. Check wires at elements and Electronic Thermostat (ET) for damage.
If this 4 flashes condition continues, replace Electronic Thermostat (ET).
4. Turn on electrical power at breaker.
E05 with an alert Icon flashing.
(also flashing red LED and beeper.)
Lower element circuit failure.
(Note: Upper element is still operable)
1. Turn off electrical power at the breaker.
2. Check element circuits for resistance of 5-25 ohms (replace if required).
3. Check wires at elements and Electronic Thermostat (ET) for damage.
If this 5 flashes condition continues, replace Electronic Thermostat (ET).
4. Turn on electrical power at breaker.
E06 with an alert Icon flashing.
(also flashing red LED and beeper.)
Electronic Thermostat (ET) failure
(Internal processor).
1. Turn off electrical power at the breaker. Now turn on electrical power to
see if error clears. If error has not cleared, replace Electronic Thermo-
stat (ET).
2. Turn on electrical power at breaker.
IMPORTANT: Before attempting to adjust the ther-
mostat, read the “Important Safety Information”
section page 4.
The Electronic Thermostat (ET) is designed so
that it may control the water heater without the
Energy Smart
®
Module (ESM) being operated, see
page 17.
If the instructions are not clear, contact a qualifi ed
person.
20 • Residen al Electric Water Heater Use and Care Guide
TROUBLESHOOTING
Alert
Icon
Error
Code
ALERT
LED
Figure 26 - ESM Diagnostic Coding