diff --git a/frappy_psi/lakeshore.py b/frappy_psi/lakeshore.py
index ea58fb6..19aa369 100644
--- a/frappy_psi/lakeshore.py
+++ b/frappy_psi/lakeshore.py
@@ -158,8 +158,9 @@ class HeaterOutput(LakeShore, HasControlledBy, HasIO, Writable):
         return self.percent_to_power(float(reply))
 
     def set_heater_mode(self, mode):
-        self.communicate(f'CSET {self.loop},{self.channel},1,1,0')
-        self.set_par(f'CMODE {self.loop}, {int(mode)}')
+        self.communicate(f'CSET {self.loop},{self.channel},1,1,0;.'
+                         f'CMODE {self.loop}, {int(mode)};'
+                         f'RANGE?')
 
 
 class TemperatureLoop340(HasOutputModule, Sensor340, Drivable, LakeShore):