31
VMIFB202
Outdoor sensor/Defrost sensor
Action:
Check that the outdoor sensor/defrost sensor is installed according to the installation instructions and that it is correctly calibrated.
Measure the ohms at the sensor to check it displays the correct value.
Install according to the instructions and calibrate, if necessary. Or replace the defrost sensor.
The defroster shunt does not regulate as it should
Action:
Manually test to check if the defroster shunt opens and closes the flow over the defroster tank. If the motor switches position when
testing, but defrosting still does not function, remove the motor and try closing and opening the valve by hand by pressing in the
spring loaded spindle. If it should be stuck or not spring back replace the insert.
If the shunt motor does not react, check measure the signals to the shunt. These are 24vac + and - signal. See wiring diagram!
If the motor is defective, replace it. If the insert jams, remove and clean/lubricate it, or replace it.
Troubleshooting Guide
Outdoor unit and defrosting problems
Motor for shunt
Defrosting 24Vac
Photograph taken
from left side.
temperature
ohm
-30
1884
-25
1443
-20
1115
-15
868
-10
681
-5
538
0
428
5
343
10
276
15
224
20
183
25
150
30
124
35
103
40
86
