Page 48
ECS-3M
SYMPTOM CAUSE and REMEDY
Lo is
continually
displayed
− Temperature is below minimum (13.5
°
F or -
10.0
°C).
− Probe is disconnected or defective.
Hi is
continually
displayed
− Temperature is above maximum (105.0°
F or 41°C).
−
Probe is short circuited.
Fan(s) or
heater not
operating
−
Verify whether the fan LED is on. If LED
is on yet fan or heater is not operating,
verify wiring, fan and fuse. Refer Figure
6 for fuse location. If fuse is blown,
replace with fuse of same type.
Stage 3 Fan
or Heater is
operating
erratically
− Verify that the software setting switch
located at the rear of the faceplate is
properly set.
− Verify the minimum rating (10mA at
230V or 20mA at 230V.
Display is
blank
− Verify that the line voltage selector
switch is properly set.
− Verify that the 10 pin flat cable between
the main board and the faceplate board
is connected.
F2 displayed
for relative
humidity
−
Humidity is below minimum (30%).
− Probe is disconnected or defective.
TROUBLESHOOTING
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