[sokoloff]

"Fan mode" in an old dehumidifier usually means that the refrigeration charge has been lost.

They (almost universally) do not have service ports, but you can charge them using a bullet piercing valve (search for Supco BPV31) and restore functionality.

[jandrese]

Of course if it is prone to catching fire randomly it would make more sense to take the rebate and buy a good one instead of trying to recharge the old leaky fire hazard.