A good starting point is to measure / verify that the heater output matches the specs.
If I had a "not much heat" problem then I would use my DVM to measure the heater element(s) resistance and compare that to the specs. I would also measure the voltage at the dryer during operation. A lesser way is to use the panel meter.
If the voltage and load are both good, then verification that the air flow is good, both intake and exhaust. Ensure that all passages are free of crud, like lint.
We had a similar problem on our 500DA. We checked everything but the lint filter. Once we cleaned that, and it had loaded up from towels, it worked perfectly again. It may be as simple an issue as was ours...
As noted above, electric dryers are very simple machines. It’s either the heating element or the exhaust. If the clothes aren’t hot, it’s the element, if the clothes are hot, but still damp, it’s the vent. Good luck.
With the dryer running, check how much air is coming out of the vent on the side of the boat. Like others have said, check the vent line. Mine was clogged. Also, it's a fire hazard. Good luck.
