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(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 Saver 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 Saver Module (ESM), if this does not correct the
problem, also replace Electronic Thermostat (ET).
E71 with an alert Icon flashing.
Energy Saver 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 1-800-365-4054 for assistance.
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