13
DISPLAY CABINET HEATED
P/N 1010772 Rev. D 12/13
MAINTENANCE (continued)
Display Codes
This section describes the different display codes and
their meanings.
TEMP
UP
TEMP
DOWN
TEMP
SCALE
F
C
O
O
“LO” flashes during the initial warm up period. The unit
continues to display this code until the unit reaches the
setpoint temperature. When the unit reaches the set-
point temperature, it displays the setpoint temperature.
This figure shows an example setpoint temperature of
150° F displayed on the console.
“HI” flashes if the actual cabinet temperature exceeds
the setpoint temperature or if the thermistor has short-
ed.
NOTE: The thermistor should be 100k ohm +/- 2% at
room temperature.
“OPEN” flashes if the thermistor is OPEN or discon-
nected. The unit will not call for heat.
NOTE: The thermistor should be 100k ohms +/- 2%
at room temperature.
“PO” In 120 VAC units, this code flashes if the supply
voltage is below 100 VAC or above 135 VAC. In 220/
240 VAC units, this code flashes if the supply voltage is
below 190 VAC or above 265 VAC.
NOTE: If voltage is within normal ranges, then the
Control Board is faulty.
To reset a unit in this state, the supply voltage must be
within acceptable limits and the unit must be turned off
for a few seconds and then turned back on.
