Installation Guide & Use and Care Guide

Residen al Electric Water Heater Use and Care Guide • 19
TROUBLESHOOTING
Setpoint
Knob
Diagnostic
LED Light
Plastic Guard
IMPORTANT: Before attempting to adjust the
thermostat, read the “Adjusting The Temperature”
section page 15.
The Electronic Thermostat (ET) is designed so
that it may control the water heater without the
Grid Communication Adaptor being operated,
see page 17.
If the instructions are not clear, contact a qualifi ed
service technician.
DIAGNOSTIC CODE CHART Electronic Thermostat (ET)
WARNING! Electrical Shock Hazard
Do not remove the plas c guard from
over wiring.
Do not touch electrical wiring.
Failure to do so can result in death or
electrical shock.
(ET)
DIAGNOSTIC
LED
INDICATES CORRECTIVE ACTION*
LIGHT ON
(Green Flash)
Normal operation. None
NO LIGHT No electrical power to control board
or diagnostic LED light burned out.
1. Check for blown fuses or tripped breaker.
2. If diagnostic LED light is burned out, replace Electronic Thermostat
(ET).
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.
2. Turn on electrical power at breaker.
3. See “Routine Maintenance” on page 25.
2 FLASHES
(Red)
Water temperature exceeded high
limit.
1. Turn off electrical power at the breaker.
2. Press the reset button (see Figure 8).
3. Turn on electrical power at breaker.
4. If error returns call a service technician for assistance.
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.
7 FLASHES
(Red)
Lower thermistor sensor failure. 1. Turn off electrical power at the breaker.
2. Check electrical connections at Electronic Thermostat (ET).
3. Replace Lower Thermistor Sensor.
4. Turn on electrical power at breaker.
8 FLASHES
(Red)
Electronic Thermostat (ET) error 1. Turn off electrical power.
2. Check wiring at Electronic Thermostat (ET) for damage.
3. Turn on electrical power at breaker.
4. If this code flashes condition continues, replace the Electronic
Thermostat (ET).