Condenser Thermistor Malfunction Alarm (E9) - Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 Service Manual

6. Condenser Thermistor Malfunction Alarm (E9)

If the control board detects an open condenser thermistor, "E9" is displayed. When the
control board detects a shorted condenser thermistor, a 10-minute delay timer begins.
After the 10‑minute delay timer expires, "E9" is displayed. To bypass the 10‑minute
delay timer, move the power switch to the "OFF" position. Then, while pressing the rail
"SET" button, move the power switch to the "ON" position.
• If this alarm appears, first make sure that the thermistor is properly connected to the
control board.
• A shorted condenser thermistor is not detected by the control board during the 1st hour
after power is turned on. To bypass the 1-hour delay timer, move the power switch to
the "OFF" position. Then, while pressing the rail "SET" button, move the power switch
to the "ON" position.
Reset Options
The "E9" alarm automatically resets when one of the following conditions is met:
• The condenser thermistor is secured to the control board.
• The condenser thermistor is within normal operating range. For details, see "II.
E. Thermistor Check."
• A functioning condenser thermistor is installed.
Possible Causes
• Trouble with the condenser thermistor. For checkout procedure, see "II.E. Thermistor
Check."
• Trouble with the control board reading the condenser thermistor.
Under 10 min.
E9 Alarm (short circuit)
Detection Point
186.8°F (86°C)
E9 Alarm (open circuit)
Detection Point
-7.6°F (-22°C)
E9 Alarm E9 Alarm
Timer Start Timer Start
10 min.
E9 Alarm
Temperature Display
E9
Blinking
E9 Alarm (short circuit) Reset
E9 Alarm (open circuit) Reset
E9
Alarm
Temperature
Display
E9
Blinking
32