DELUXE
Inverter
Service
M
anual
(12) F4- Exhaust sensor error
Explanation of
error
Cause:
The main external control panel will indicate “exhaust sensor error” and
send it to the main internal control panel when it detects short circuit or open
circuit of the exhaust sensor.
Inspection path:
Exhaust sensor→Sensor wire→Connectors→Main external
control panel
Tools required
for inspection
Multimeter, 50KΩ standard exhaust sensor (25
℃
)
Frequent
problematic part
Exhaust sensor, main external control panel
Inspection
procedure and
key points
1. Check if there is any evident resistance problem in the sensor. Whether in
short circuit or open circuit, the resistance should maintain in a reasonable range
(about 50KΩ when the compressor is not working and between 3 KΩ and 30
KΩ after the compressor works for a while, the corresponding exhaust
temperature should be 100
℃
-38
℃
).
2. Check if the sensor wire or the sensor connecting wire is damaged.
3. Check if the connecting terminal is connected firmly, the weld between the
terminal and the main control panel is loose; 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 wire of coil sensor is above the copper
pipe.
5. If there is no standard sensor at hand, exchange the exhaust sensor with the
one beside it to see if the error changes. If yes, there is something wrong with
the sensor and it should be replaced; if it still indicates “external coil sensor
error”, replace the main external control panel.
Special attention
Most exhaust sensors have a standard resistance of 50KΩ (25
℃
). Do not use
improper sensor during maintenance or the machine will
frequently s
ense the
exhaust temperature mistakenly and enter the protection state. For example, i
f
the
20KΩ coil sensor
is mistakenly replaced
for the exhaust sensor, the
exhaust temperature that the main external control panel senses will be higher
than the actual exhaust temperature which will
frequently
make normal air
conditioners enter the high exhaust temperature protection state, and the
compressor frequency threshold will rise and lead to shutdown of the
compressor.
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