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*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.
(ESM)
ERROR CODE
(ET)
DIAGNOSTIC LED
INDICATES CORRECTIVE ACTION*
E9
E10
E11
E12
9, 10, 11 or 12 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).