Fault# Description Customer Action
PORT_ EXP_ INIT Could not initialize port
expander(s)
Check I2C connections
PORT_EXP_READ Could not read port expander Check I2C connections
PORT_EXP_SET
Could not set output on port
expander
Check I2C connections
PORT_ EXP_OL AT Could not latch output on port
expander
Check I2C connections
Check voltage on output
pins of port expander
PORT_ EXP_ BAD_
CONTROL
Control register mismatch on
port expander or issue writing to
control register
Verify Relay board was not
reset without control board
PORT_EXP_FAILURE
Output register mismatch on port
expander
Verify Relay board was not
reset without control board
MODEL_CONN Model connector missing or
invalid
Check model connector
OVERHEAT_ERROR Overheat condition detected Check Overheat thermistor
Check operating
temperature thermistor
POWER_LOSS_
ERROR
Power loss condition detected Check power cable
Check power to control
board
SLOW_FILL_ERROR Water level has not reached
desired level when lling for 15
minutes
Check water supply
Check water valves
Check water valve relays
Check pressure sensor
49
Part # 8533-110-001 11/20
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