Issue is with controllers is that you can't manually defrost anymore. They rely on boards like you said, or thermistors that only close when cold to turn on th

Issue is with controllers is that you can't manually defrost anymore. They rely on boards like you said, or thermistors that only close when cold to turn on the defrost coil. Look up if your fridge has an actual manual defrost method(rather than your 'manual' defrost). Some of them are rather absurd. But if you're lucky enough to have one you can simply force extra defrosts when it's real hot/fridge being opened often instead of having to pull the shroud and manually do it. First Test Method: Turn the thermostat off for 15 seconds. Turn the thermostat on for 5 seconds. Turn the thermostat off for 15 seconds. Turn the thermostat on for 5 seconds. Turn the thermostat off for 15 seconds. Turn the thermostat on for 5 seconds. Turn the thermostat off.*