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ECS 1M
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 5 for fuse location. If fuse
is blown, replace with fuse of same
type.
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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