22 Troubleshooting
Error Code Reason Self-diagnostic/Action
E615 Abnormal operation: input and memory
Manual RESET
Auto RESET
Alarm
E736 Abnormal operation: cascade communication Alarm
E740
Abnormal operation: outdoor temperature sensor (appears only when the
outdoor reset curve is enabled).
Alarm
E761 Abnormal Operation: Pre-Heat Aquastat Alarm
E777 LWCO (service code: 7700) (external device) Auto RESET
E782 Abnormal operation: main panel communication Alarm
E784 Abnormal operation: zone controller communication Alarm
If these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.
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