Alarm Sensor - Danfoss Heat Pump Troubleshooting Manual

Troubleshooting Guide

Alarm sensor

Action:
Measure the resistance of the sensor, check the ohm value against the temperature according to the table below.. If the actual tempera-
ture and the temperature displayed do not correspond, calibrate or replace the sensor.
When measuring the resistance of the sensor the sensor must be released before measuring!
If a fault in the outdoor sensor is suspected, check that the cable between the heat pump and outdoor sensor is not damaged in
anyway by nails, pins or another cable securing device. This is a commonly occurring fault.
If the sensor does not give a correct value, the sensor is defective.
Alarm sensor
150 ohm sensor
Outdoor / Defrost sensor
temperatur 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
VMIFB202
22 kohm sensor
Supply line, return line, hot water,
brine in, brine out, discharge pipe sensor
temperatur kohm
0 66.3
5 52.4
10 41.8
15 33.5
20 27.1
25 22
30 18
35 14.8
40 12.2
45 10.1
50 8.5
55 7.1
60 6
65 5
70 4.2
75 3.7
80 3.1
85 2.7
15