Problem calibrating K2649

I’ve checked and re-checked my assembly and can’t figure out where I’ve gone wrong. I’ve assembled the thermostat for Celcius. I tried calibrating the thermostat at freezing then at boiling, but can’t seem to go over 20C for boiloing point calibration. Help!

Due to the complexity of this kit, it is hard to troubleshoot from a distance.
We’d recommend that you return your kit for inspection to:

Velleman Kit Tech. Dept.
Legen Heirweg 33
9890 Gavere