60 • Residen al Gas Water Heater Use and Care Guide
TROUBLESHOOTING
Error
Code
Error Type
Procedure
E396
Pump - Low Speed
1. Check the pump wiring for a short or disconnec on. Correct any loose connec-
ons and replace any damaged wire/connector.
2. Check the inlet
fi
lter for debris and clean.
3. Check the pump and water lines for debris and clear.
4. Check for a faulty check valve or something else crea ng resistance and clear.
5. Check to ensure the maximum pipe length and size has not been exceeded and
meets the requirements in the Recircula on and Combina on Potable Water
sec ons of this manual.
6. If the error s ll occurs, contact a quali
fi
ed service technician.
E397
Pump - Low Current
1. Check the pump wiring for proper voltage.
2. If the error s ll occurs, contact a quali
fi
ed service technician.
E398
Pump - Low Water Flow
1. Check the pump wiring for a short or disconnec on. Correct any loose connec-
ons and replace any damaged wire/connector.
2. Check the inlet
fi
lter for debris and clean.
3. Check the pump and water lines for debris and clear.
4. Check for a check valve stuck in the closed posi on; a shuto
ff
valve in the closed
posi on; or something else crea ng resistance. Clear the blockage.
5. Check to ensure the maximum pipe length and size has not been exceeded and
meets the requirements in the Recircula on and Combina on Potable Water sec-
ons of this manual. Table 13 on page 34.
6. If the error s ll occurs, contact a quali
fi
ed service technician.
E399
Pump - Power Limit Exceeded
1. Check the pump wiring for a short or disconnec on. Correct any loose
connec ons and replace any damaged wire/connector.
2. If the error s ll occurs,contact a quali
fi
ed service technician.
E400
Communica on Fault with UIM
1. Check the UIM wiring. Correct any loose connec ons and replace any damaged
wire/connector. If the error s ll occurs, contact a quali
fi
ed service technician.
E401
Communica on Fault with
Remote Controller
1. Check the Remote Controller wiring. Correct any loose connec ons and replace
any damaged wire/connector.
2. Only one remote controller can be installed, remove any addi onal remote
controllers.
3. If the error s ll occurs, contact a quali
fi
ed service technician.
E402
Communica on Fault in
Cascade System
1. Check the Cascade wiring. Correct any loose connec ons and replace any
damaged wire/connector.
2. Cycle the heater’s power o
ff
/on if the cascade wiring was disconnected while the
system s ll had power.
3. If the error s ll occurs, contact a quali
fi
ed service technician.
