13
ST 5220
QM 1336.rev.01
3
Defective Probes
Room Probes: If a defective probe is detected, the Defective Probe Pilot
Light flashes. The room temperature shown on the display is then the average
temperature measured by the probes in working condition. The controller
will operate according to this temperature.
To identify the defective probe:
n
Set the selection knob to ROOM
TEMPERATURE
. The room tem-
perature is displayed.
n
Press the push-button. If the
probe connected to input # 1 and
supplied with the controller is not
defective, the letters"PR1" are
displayed, alternating with the
temperature measured by the
probe. If the probe is defective,
the letters "PR1" are displayed,
alternating with the letter "P".
For each additional probe connected to the controller:
n
Press the push-button once again. If the probe is not defective, the
letters "PR#" (where # is the number of the input to which the probe
is connected) are displayed, alternating with the temperature mea-
sured by the probe. If the probe is defective, the letters "PR#" are
displayed, alternating with the letter "P".
