diff --git a/hardware/relay/pwm-dimmer_relay.py b/hardware/relay/pwm-dimmer_relay.py
index 72bdcb177..6b3f7e33b 100644
--- a/hardware/relay/pwm-dimmer_relay.py
+++ b/hardware/relay/pwm-dimmer_relay.py
@@ -145,5 +145,4 @@ class terrariumRelayDimmerIRF520(terrariumRelayDimmerPWM):
 
   # # Dimmer settings
   _DIMMER_FREQ       = 10000 # Tested with a 12V PC fan. Low freq. caused some high pitching noise
-  _DIMMER_MAXDIM     = 100
-  _DIMMER_DUTY_CYCLE = 10000
\ No newline at end of file
+  _DIMMER_MAXDIM     = 100
\ No newline at end of file