Installation Guide

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.
DIAGNOSTIC CODE CHART ELECTRONIC THERMOSTAT (ET)
22 • Residen al Electric Water Heater Use and Care Guide
TROUBLESHOOTING
Setpoint
Knob
Diagnostic
LED Light
Plastic
Guard
WARNING! Electrical Shock Hazard
ŽŶŽƚƌĞŵŽǀĞƚŚĞƉůĂƐƟĐŐƵĂƌĚĨƌŽŵ
ŽǀĞƌǁŝƌŝŶŐ͘
ŽŶŽƚƚŽƵĐŚĞůĞĐƚƌŝĐĂůǁŝƌŝŶŐ͘
&ĂŝůƵƌĞƚŽĚŽƐŽĐĂŶƌĞƐƵůƚŝŶĚĞĂƚŚŽƌ
ĞůĞĐƚƌŝĐĂůƐŚŽĐŬ͘
Figure 27 - ET Diagnostic Coding
(ET)
DIAGNOSTIC LED
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
Not 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.
1 FLASH
(Red)
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.
2 FLASHES
(Red)
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.
3 FLASHES
(Red)
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.
4 FLASHES
(Red)
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.
5 FLASHES
(Red)
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.
6 FLASHES
(Red)
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.