SC No. Level Error Name/Error Condition/Major Cause/Solution
551-01 A Thermistor (edge) disconnection
Temperature of 0°C or lower is detected for 7 seconds
continuously.
Detection time: 10 or more
Measurement interval: 0.5 sec.
Thermistor (edge) disconnection
Thermistor (edge) not connected correctly
Reconnect the thermistor (edge).
Replace the thermistor (edge).
Clear this SC by executing SP5-810-001.
SC No. Level Error Name/Error Condition/Major Cause/Solution
551-02 A Thermistor (edge) disconnection: Low voltage
An error is detected only when the input voltage at power-on
is low.
Temperature of 0°C or lower is detected for 25 seconds
continuously.
Detection time: 10 or more
Detection interval: 0.1 seconds
Thermistor (edge) disconnection
Thermistor (edge) not connected correctly
Reconnect the thermistor (edge).
Replace the thermistor (edge).
Clear this SC by executing SP5-810-001.