ESP S2 Mini with PT100 and MAX31865 - erroneous temperature readings

Hi,

we are trying with a colleague to start a temperature measurement with the help of a PT-100 ( 3-wire ) and a MAX31865 amplifier and an ESP S2 Mini.
The readings however are strange, in a room where it is about 23 deg C , I get this measurement :
RTD Sensor 0:
Resistance = 101.31 ohms
Temperature = 3.34 deg C
Fault Status = OK

The sensor also connected to the MAX31865 does not respond to temperature changes, but disconnected from the MAX31865 when measured with a multimeter directly under the wires gives a resistance of 109 ohm = 23.10681 deg C , and after heating by hand 112 = 30.84446 deg C, so it looks like the sensor itself is working properly. What could be the cause of this strange reading by the MAX31865 ? What can I check ?

.

Measure with a voltmeter if any voltage is going to the sensor. See if it changes as it heats up.
Remove more cables and see how it reports errors.
Check with an ohmmeter how the wires in the sensor are connected and see if you have plugged them in correctly. If so, can always swap to a trunk and fiddle with the jumpers.
Measure the power supply on the IC, it should be 3V3. Sometimes it's worth an oscilloscope, as it can excite (not these specific ones, just Arduino "modules and clones" in general.
Write your own "driver" it happened to me in acts of desperation.