diff --git a/klippy/extras/temperature_fan.py b/klippy/extras/temperature_fan.py
index 92dda7e0..aee94f28 100644
--- a/klippy/extras/temperature_fan.py
+++ b/klippy/extras/temperature_fan.py
@@ -147,7 +147,9 @@ class ControlPID:
         self.Ki = config.getfloat('pid_Ki') / PID_PARAM_BASE
         self.Kd = config.getfloat('pid_Kd') / PID_PARAM_BASE
         self.min_deriv_time = config.getfloat('pid_deriv_time', 2., above=0.)
-        self.temp_integ_max = self.temperature_fan.get_max_speed() / self.Ki
+        self.temp_integ_max = 0.
+        if self.Ki:
+            self.temp_integ_max = self.temperature_fan.get_max_speed() / self.Ki
         self.prev_temp = AMBIENT_TEMP
         self.prev_temp_time = 0.
         self.prev_temp_deriv = 0.