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
main PCB 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 main PCB
System pressure, liquid deficiency, compressor top head sensor
(temperature protection switch), Outdoor Unit main PCB
1. First check if the compressor top head temperature is too high
(above 110℃) and causes action of the compressor top head sensor
(temperature protection switch); reasons why the compressor top head
temperature is too high may be: the system is deficient in liquid and the
compressor idles; the system is blocked and the pressure of the
compressor is too high.
2. After excluding the possibility of the system problem, please note
that 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.
3. Check if the sensor wire or the sensor connecting wire is damaged.
4. Check if the connecting terminal is connected firmly, the weld
between the terminal and the main PCB is loose; pull the terminal
slightly for inspection if necessary.
5. Disconnect the power supply and short circuit a metal with the
compressor top head terminal of the Outdoor Unit main PCB. If the
compressor top head sensor error disappears after start up, then replace
the sensor; if the error still occurs, it’s probably the main PCB
problem, replace the Outdoor Unit main PCB.
The compressor top head sensor is just a temperature switch which is
highly reliable and is less likely to go wrong generally. Pay more
attention to the system pressure and the compressor temperature.
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