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Digiital Temperature Display Board - 501HT
Wash temperature is below 100°F
Bad booster thermistor
Open or broken wire between thermistor and
board
Loose connection
Wash tank has no water and is extremely hot
Wash temperature is above 180°F
Wash tank has no water and heater is on
Booster temperature is below 100°F
Rinse temperature is above 200°F
Booster tank has no water and heater is on
Bad booster thermistor
Broken wire between thermistor and board
Loose connection
Booster tank is dry and extremely hot
Booster and wash tank temperature below
100°F
Booster temperature above 200°F and
wash tank temperature above 180°F
Thermistor quick disconnect plug on back of
board is disconnected
Booster tank and wash tank are both dry
Broken wires on thermistor harness, or both
thermistors are unplugged or defective