The CZU1201 requires replacement, but the controller had a exposed setpoint adjust dial on its fascia, the replacement CZU4201 does not.
Replace the CZU1201 with the CZU4201 and a STR612 setpoint adjust unit, Wire to terminals 9 and 10 on the controller, set the internal setpoint on the controller to 10'C.
CZU1201 datasheet click here.
CZU4201 datasheet click here.
STR612 datasheet click here.