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Low Supply Voltage Fault (Very low input voltage):
Power supply voltage is extremely low-
• Verify the unit is connected to 240 VAC, unit is intended for 240 VAC connection only. The unit will not
operate below 184 VAC.
High Temperature Lock Out (ECO tripped due to excessivly high tank temperature):
Eco has detected a tank temperature of 190 ± 5°F and tripped-
• Check the ECO-if tripped, press red button to reset. See “ECO Switch Troubleshooting” (p.25).
• Check for faulty control board not shutting off heating means (element or heat pump)
Loose connection or damaged wire-
• Turn off power at the circuit breaker/fuse box and check for a loose connection or damaged wire
between the ECO and control board.
Faulty temperature sensor-
• Check the upper temperature sensor; refer to “Temperature Sensors” (p.32) for details.
• A faulty lower temperature sensor will not cause this error.
Faulty ECO-
• Check the ECO with an Ohm meter: Pin 1 to 2 and pin 3 to 4 should measure short, if they do not,
press the red reset button and check again. If the pins are shorted, the ECO is good, if not the ECO is
faulty and should be replaced.
Condensate Drain Alarm (The installed condensate pump is not working):
Condensate pump not operating-
• Check to see if condensate pump is plugged in and has power. Also check circuit breaker/fuse box
and GFCI (if used).
• Check operation of condensate pump; replace if defective.
Condensate pump drain line is blocked-
• Check condensate pump outlet tube for blockage.
Loose connection or damaged wire in the condensate pump failure detect circuit-
• Check control wire for connections to condensate pump. If error persists see “Condensate Pump
Troubleshooting” (p.46).
Power Anode Over Current (Powered anode circuit not working):
Faulty control board-
• Replace control board.
• If replacing the control board doesn’t resolve the issue, contact technical support.
Power Anode Max Current at Min PWM (Powered anode circuit not working):
Faulty control board-
• Replace control board.
• If replacing the control board doesn’t resolve the issue, contact technical support.
Power Anode Offset Current (Powered anode circuit not working):
Faulty control board-
• Replace control board.
• If replacing the control board doesn’t resolve the issue, contact technical support.
Fault Code Troubleshooting Guide