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F4 – EXHAUST SENSOR ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Key Details
Cause: The outdoor unit 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
Multimeter, 50KΩ standard exhaust sensor
Exhaust sensor, outdoor unit control panel
Check if there is any evident resistance problem in the
1.
sensor. if 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.
Check if the sensor is damp/wet. The coil sensor is quite
4.
easy to be damp/wet in case the lead wire of coil sensor
is above the copper pipe.
If there is no standard sensor at hand, exchange the
5.
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 outdoor unit
control panel.
DO NOT USE A SENSOR WITH A VALUE LOWER OR HIGHER
THAN 50KΩ
13
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