LG RCWFH Series Instruction Manual page 129

129
Remedy for abnormal status
Vane sensor error
Figure 94. Vane sensor
Vane sensor
Release vane sensor connection from the relay board. After converting the tester to the resistance measurement
mode, measure resistance between a and b, and there shall be a certain resistance. And after converting the vane to
manual operation, when the vane is moved, there shall be vane sensor movement and change in resistance value.
Even if the vane sensor is moving but there is no change of resistance value, wiring is wrong or vane sensor is dam-
aged. While vane is completely closed, and opened completely, if the resistance between a and b increases uni-
formly and resistance between b and c of the vane sensor decreases uniformly, vane sensor is OK. Also measure
resistance between a, b, c, and main body, and it shall not be angle line.
If the vane sensor is normal, re-connect the sensor, completely close the vane, and check if vane value is 0% and
100% after completely opening. If the value changes and vane opening % is wrong, sensor needs to be set again.
If there is no change of value, check if 100% is set in 'sensor setting-guide vane setting" category, and check if A/D
value sensor value changes when vane moves. If sensor value changes, set vane again.
If sensor value does not change, convert tester to DC voltage 30V measuring position, and when voltage is measured
with + at the point where vane sensor "a" is connected and – at the point where vane sensor c is connected, DC 5V
must be measured.
If the voltage is not correct, check relay board main input power.
If relay main power is normal, vane sensor is normal, and sensor value does not change, then replace relay board.