Vm148 reading temperature

i bought a vm148.
Instaled it with a ventilator.
It’s orking but the reading of the temperatue are just not ok.
it flashes from for example 22->30->26>22->26… degrees.
What’s going wrong?

Hi @stevenlambert,

Is it possible that the distance between the probe (thermistor) and the module is more than 2 meters? It could be that the wire is picking up noise and by this affect the readout. If You extend the included sensor cable, did You use a shielded cable?

If You use the original sensor cable (not extended) it may help to calibrate the device.

Press MENU until “CAL” and press ENTER (<-)
Adjust the displayed temp° until correct (measured with another “calibrated” thermometer).

Velleman Support