Installation Guide

(ESM) ERROR CODE INDICATES CORRECTIVE ACTION*

E51 with an alert Icon flashing.

A failure to communicate with the Electronic

Thermostat (ET).

1. Turn off electrical power at the breaker, check all electrical connections,

and wiring for damage.

2. Replace the Electronic Thermostat (ET).

3. Turn on electrical power at breaker.

E52 with an alert Icon flashing.

Energy Smart

Module (ESM) is receiving the

wrong data from the Electronic Thermostat

(ET).

1. Turn off electrical power at the breaker, check all electrical connections,

and wiring for damage.

2. Replace the Energy Smart

Module (ESM), if this does not correct the

problem, also replace Electronic Thermostat (ET).

E71 with an alert Icon flashing.

Energy Smart

Module (ESM) thermistor

failure.

1. Turn off electrical power at the breaker, check all electrical connections,

and wiring for damage.

2. Turn on electrical power at breaker.

3. If error returns call service technician for assistance.

Residen al Electric Water Heater Use and Care Guide • 21

TROUBLESHOOTING

*These instructions are brief and intended as guidance for a qualiﬁ ed person. If you lack the necessary

skills to perform these procedures call 1-877-817-6750 for assistance.