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FA – RECIRCULATED SENSOR ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: When the main control panel detects an open circuit
or short circuit of the recirculated sensor, it would raise an
alarm of "recirculated sensor error" and send it to the main
internal control panel to indicate it.
Inspection path: four-way valve → recirculated sensor →
sensor wire → connectors → outdoor unit control panel
Multimeter, pressure meter, normal 20KΩ recirculated sensor
Four-way valve, recirculated sensor, outdoor unit control panel.
1.
If the error appears in heating mode but not in cooling
mode, first check if the four-way valve failed to change
the position or there is a back flow, which can be
estimated by measuring the high and low pressures with
the pressure meter. During heating, check if the four-way
valve terminal can switch a circuit of 220V, if yes, then
the four-way valve is faulted; and if there is no circuit over
220V in heating, it means the outdoor unit control valve
is faulted.
2.
If it is not the four-way valve that is faulted, check on the
resistance value and short circuit problems and the
resistance value should be within a proper range (around
20KΩ at temperature of 25℃).
3.
Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control panel
is loose and pull the terminal slightly for inspection if
necessary.
4.
Check if the sensor is damp/wet.
5.
Replace the possibly faulted recirculated sensor with a
normal one. If the error is still there, consider replacing
the main external control panel.
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