Manual

(ESM) ERROR CODE
E51 with an alert Icon flashing.
E52 with an alert Icon flashing.
E71 with an alert Icon flashing.
INDICATES
A failure to communicate with the Electronic
Thermostat (ET).
Energy Smart® Module (ESM) is receiving the
wrong data from the Electronic Thermostat
(ET).
Energy Smart® Module (ESM) thermistor
failure.
CORRECTIVE ACTION*
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.
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).
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.
*These instructions are brief and intended as guidance for a qualified person. If you lack the necessary
skills to perform these procedures call 1-877-817-6750 for assistance.
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