Primo Water Dispenser cold water stopped dispensing. Reservoir was freezing causing cold water not to dispense. No thermostat on the unit but it does have a temperature sensor. Replaced the temperature sensor for a $2.00 and working again. Easy, inexpensive fix.

Here is the part at Amazon:

DROK 10K Temperature Sensor Probe, 5pcs 1 Meter Waterproof Temp Sensor Probe, Stainless Steel 3950 NTC Temp Sensor Probe, Digital Temperature Transmitter Extension Cable