Omni-devices should no longer go and turn themselves off permanently in case of power failure.

code/ATMOSPHERICS/components/omni_devices/filter.dm

@@ -58,14 +58,8 @@
 	return 0
 
 /obj/machinery/atmospherics/omni/filter/process()
-	..()
-	if(error_check())
-		on = 0
-	
-	if((stat & (NOPOWER|BROKEN)) || !on)
-		update_use_power(0)	//usually we get here because a player turned a pump off - definitely want to update.
-		last_flow_rate = 0
-		return
+	if(!..())
+		return 0
 
 	var/datum/gas_mixture/output_air = output.air	//BYOND doesn't like referencing "output.air.return_pressure()" so we need to make a direct reference
 	var/datum/gas_mixture/input_air = input.air		// it's completely happy with them if they're in a loop though i.e. "P.air.return_pressure()"... *shrug*

code/ATMOSPHERICS/components/omni_devices/mixer.dm

@@ -98,14 +98,8 @@
 	return 0
 
 /obj/machinery/atmospherics/omni/mixer/process()
-	..()
-	if(error_check())
-		on = 0
-	
-	if((stat & (NOPOWER|BROKEN)) || !on)
-		update_use_power(0)	//usually we get here because a player turned a pump off - definitely want to update.
-		last_flow_rate = 0
-		return
+	if(!..())
+		return 0
 
 	//Figure out the amount of moles to transfer
 	var/transfer_moles = 0

code/ATMOSPHERICS/components/omni_devices/omni_base.dm

@@ -50,10 +50,8 @@
 /obj/machinery/atmospherics/omni/update_icon()
 	if(stat & NOPOWER)
 		overlays = overlays_off
-		on = 0
 	else if(error_check())
 		overlays = overlays_error
-		on = 0
 	else
 		overlays = on ? (overlays_on) : (overlays_off)
 
@@ -64,6 +62,16 @@
 /obj/machinery/atmospherics/omni/proc/error_check()
 	return
 
+/obj/machinery/atmospherics/omni/process()
+	if(error_check())
+		on = 0
+
+	if((stat & (NOPOWER|BROKEN)) || !on)
+		update_use_power(0)	//usually we get here because a player turned a pump off - definitely want to update.
+		last_flow_rate = 0
+		return 0
+	return 1
+
 /obj/machinery/atmospherics/omni/power_change()
 	var/old_stat = stat
 	..()