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（3）E2 -Outdoor Unit coil sensor error
Cause: The detection of short circuit or open circuit of Outdoor Unit
coil sensor during the inspection of Outdoor Unit main PCB, indicated
by “Outdoor Unit coil sensor error”.
Inspection path: Sensor→Sensor wire→Connectors→Outdoor Unit
main PCB
Tools required
for inspection
Multimeter, 20KΩ standard sensor (25℃）
Frequent
problematic part
Outdoor Unit coil sensor, Outdoor Unit main PCB
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 PCB 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 Outdoor Unit coil by other sensor asides, and
then check whether the error still exists; if the error disappears, replace
the sensor; if the error still exists, check the Indoor Unit main PCB and
change if necessary.
Most Indoor Unit 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 led 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.
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