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F5 – COMPRESSOR TOP HEAD SENSOR ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: The compressor top head sensor is a compressor top
head temperature protection switch most of the time. It keeps
closed (short circuit) when the compressor temperature is
normal and switches off (open circuit) when the temperature is
too high. The outdoor unit control panel will indicate
"compressor top head sensor error" when it senses
disconnection of the compressor top head protection switch.
Inspection path: Compressor top head sensor (temperature
protection switch) → Sensor wire → Connectors → Outdoor
unit control panel
Pressure gauge, multimeter
System pressure, liquid deficiency, compressor top head
sensor (temperature protection switch), outdoor unit control
panel
1.
First check if the compressor top head temperature is too
high (above 110℃) and causes the error. Reasons why
the compressor top head temperature is too high may be:
the system is low in coolant and the compressor idles; the
system is blocked, and the pressure of the compressor is
too high.
2.
The temperature protection switch is closed normally.
Test if the terminals of the sensor are in the short-circuit
condition with the multimeter. In the case of open circuit,
then there is something wrong with the sensor or lead
wires.
Check if the sensor wire or the sensor connecting wire is
3.
damaged.
Check if the connecting terminal is connected firmly. The
4.
weld between the terminal and the main control panel is
loose, pull the terminal slightly for inspection if
necessary.
If the compressor top head sensor error disappears after
5.
start up, then replace the sensor; if the error still occurs,
it's probably the main control panel problem, replace the
outdoor unit control panel.
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