diff --git a/src/thermostat/thermostat.rs b/src/thermostat/thermostat.rs
index 58cd346..bc222b5 100644
--- a/src/thermostat/thermostat.rs
+++ b/src/thermostat/thermostat.rs
@@ -213,12 +213,14 @@ impl Thermostat {
     }
 
     pub fn power_up(&mut self) {
-        self.max1968.power_up();
+        if !self.max1968.is_powered_on() {
+            self.max1968.power_up();
+            self.pid_ctrl_ch0.reset_pid_state();
+        }
     }
 
     pub fn power_down(&mut self) {
         self.max1968.power_down();
-        self.pid_ctrl_ch0.reset_pid_state();
     }
 
     fn set_center_pt(&mut self, value: ElectricPotential) {