Diagnostic Codes - A.O. Smith Voltex Manual

DIAGNOSTIC CODES

DISPLAY SHOWS
UPPER ELEMENT
CONNECT
FAULT
LOWER ELEMENT
CONNECT
FAULT
HEAT PUMP
CONNECT
FAULT
FAN
CONNECT
FAULT
AMBIENT TEMP
SENSOR SHORT OR
OPEN
OR AD ERROR
UPPER TEMP
SENSOR SHORT OR
OPEN
OR AD ERROR
LOWER TEMP
SENSOR SHORT OR
OPEN
OR AD ERROR
DISCHARGE TEMP
SENSOR SHORT OR
OPEN
OR AD ERROR
COIL TEMP
SENSOR FAULT
OR AD ERROR
MAIN CIRCUIT BOARD
FAULT
HIGH TEMP
LOCKOUT
CONDENSATE
DRAIN
ALARM
(If Accessory Condensate
Pump is Installed)
LOW WATER
LEVEL ALARM
COMMUNICATION
ERROR
16
INDICATES
1. Upper element is not
functioning
1. Lower element is not
functioning
1. Heat Pump compressor is
not functioning.
1. Heat Pump fan is not
functioning.
1. Ambient Temperature
Sensor is not functioning.
1. Upper Temperature Sensor
is not functioning.
1. Lower Temperature Sensor
is not functioning.
1. Discharge Temperature
Sensor is not functioning.
1. Coil Temperature Sensor is
not functioning.
1. Main Circuit Board is not
functioning.
1. Water temperature in unit
has exceeded 190° F.
1. Condensate pump failure.
1. Not enough water in the
tank.
(Tank not full)
1. No communication between
mainboard and user
interface board.
CORRECTIVE ACTION
1. Turn off power at the circuit breaker/fuse box and check for
a loose connection at the element. For access directions
see "Heating Element Replacement" section. If error persists
proceed to the next step.
2. Replace non-functioning element. See "Heating Element
Replacement" section.
1. Turn off power at the circuit breaker/fuse box and check for
a loose connection at the element. For access directions
see "Heating Element Replacement" section. If error persists
proceed to the next step.
2. Replace non-functioning
Replacement" section.
IMPORTANT:
Using an element greater than 2000 watts in
place of the lower element will damage the water heater and
void the warranty.
1. Contact a qualified person to service the heat pump.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. Contact a qualified person to service the unit.
1. See "Safety Shut-off" section.
1. Check to see if accessory condensate pump is plugged in and
has power. Also check circuit breaker/fuse box and GFCI (if
used). if error persists proceed to the next step.
2. Check condensate pump outlet tube for blockage. if error persists
proceed to the next step.
3. Check control wire connections to condensate pump. If error
persists proceed to the next step.
4. Replace accessory condensate pump. If error persists contact a
Qualified Person.
1. Fill Completely - Open all hot water taps in home and run until
water (uninterrrupted by air) flows from all open hot water
taps.
1. Contact a qualified person to service the unit.
element. See "Heating Element