Installation Guide

TROUBLESHOOTING
Electric Tankless Water Heater • 19
Error Codes for Two and Four Chamber Models
If you have a point-of-use model, see page 17.
WARNING
Electric Shock Risk
• Contact with the electrical parts inside the water heater can result in severe injury or death from electrical shock:
• Disconnect power by opening the circuit breaker(s) or removing the fuses before installing or servicing.
• Some models are connected to more than one branch circuit, and more than one disconnect switch may be
required to de-energize the equipment. All branch circuits must be disconnected prior to service.
Display Description Action / Solution
E02 Hardware determined that the
heated water has exceeded the
temperature limit.
Turn off power to the water heater. Contact Technical Support.
E03 Low water level in heater.
1. Turn off power to the water heater.
2. Turn on a nearby hot water faucet to flush air out of the water line.
3. When water runs uninterrupted from the hot water fixture, turn on
power to the water heater.
E04 Moisture/leak detected in heater. Turn off power and water supply to the water heater.
Contact Technical Support.
E06 So ware determined that the
water temperature is too high.
This error may appear when the unit is powered up. Turn on a hot water
tap to run water through the water heater. The error should clear. If not,
turn off the power to the water heater. Contact Technical Support.
E10 Inlet temperature sensor is open.
1. Turn off power to the water heater.
2. Check the connec ons of the thermistor in ques on.
3. Disconnect the thermistor, then reconnect it.
4. Turn on power to the water heater.
5. Does the error code reoccur? If yes, turn off power and replace the
thermistor that is listed in the le -hand column. See “Thermistor
(Temperature Sensor) Replacement” on page 25.
E11
Open
thermistor.
2- and
4-Chamber
models:
TH-1 open.
Point-of-use
models:
T-Out open.
E12
Open
thermistor.
2-Chamber
models:
Outlet
thermistor
open.
4-Chamber
models:
TH-3 thermistor
open.
E13 4-Chamber models only:
TH-2 thermistor is open.
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