You should get a red led when the heater is on, do you?
Either way, try plugging the heater into the D9 the fan port and turn the fan on to 255, see if it gets warm, don’t go too long though as there is no temp control.
It’s likely to be a defective heater cartridge. If you have a multimeter you can check its resistance, it should be a few ohms. If the resistance is high or if you have infinite resistance, then just replace the heating element with a new one.
I ordered some replacement heaters…and just noticed I ordered ‘12V 30W 6*20’ rather than 40W. (5 pack for $9)
Will this make a big difference? Will they still work?
They don’t come in until tomorrow,
(If they won’t work, I’ll order the 12v 40w today and send the 30w back.)