w w w . i n n o v a i r . c o m
DELUXE
Inverter
Service
M
anual
（
3
）
E3 -internal coil sensor error
Explanation of
error
Cause:
The detection of short circuit or open circuit of internal coil sensor
during the inspection of main internal control panel, indicated by “internal coil
sensor error”.
Inspection path:
Sensor→Sensor wire→Connectors→Main internal control
panel
Tools required
for inspection
Multimeter, 5KΩ or 20KΩ standard
sensor
（
25
℃
）
Frequent
problematic part
Internal temperature sensor, main internal control panel
Inspection
procedure and
key points
1. Check whether there’s resistance problem, short circuit or open circuit in the
sensor; the resistance value shall with a reasonable range (about 20KΩ for
frequency conversion machine)
2. Check whether the sensor wire is broken.
3. Check whether the terminal connectors are well fixed; check whether the weld
between the terminal and the main control panel is loose
and pull the terminal
slightly for inspection if necessary.
4. Check whether the sensor is affected with damp. The coil sensor is quite easy
to be affected with damp in case the lead of coil sensor is above the copper pipe.
5. In case no standard sensor is available at present, replace the temperature
sensor of internal coil by
a generic
sensor and then check whether the error
still
exists; if the error disappears, replace the sensor; if the error still exists,
check
the main internal control panel and change if necessary.
Special attention
Most internal temperature sensors of the frequency conversion machine have a
resistance value of 20KΩ.
Do not use improper sensor during repairing and maintenance, or it may le
a
d
to the start of anti-frosting or overheat protection mode due to wrong
temperature sensing of the machine.
In case a sensor with the resistance value over 20KΩ is used, the detected
temperature will be much lower than the actual temperature, which may lead to
the high pressure of cold-blast protection system during the heating process, or
the frequent start of anti-freezing protection during the cooling process.
I
n case a sensor with the resistance value below 20KΩ is used, the detected
temperature will be much higher than the actual temperature, which may lead to
the frequent start of overheat protection mode during the heating or the overload
protection during the cooling process.
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