DELUXE
Inverter
Service
M
anual
（
2
）
E2 -external coil sensor error
Explanation of
error
Cause:
The detection of short circuit or open circuit of external coil sensor
during the inspection of main external control panel, indicated by “external
coil sensor error”.
Inspection path:
Sensor→Sensor wire→Connectors→Main external control
panel
Tools required
for inspection
Multimeter, 20KΩ standard sensor (25
℃
）
Frequent
problematic part
External coil sensor, main external 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
humidity.
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 external 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 protection mode due to wrong temperature sensing of the
machine, or the protection error.
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 frequent entering of defrost mode, the illusory defrosting or the
protection error during the cooling process.
In 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 defrost error during the heating process, or the start of protection during the
cooling process.
25
