XD4-240 overheats and locks up if the environment temperature reaches 80F.
It looks like main processing board locks up, but not the IAPs, so all the wireless clients remain connected to IAPs, with no network access.
The fan is working.
Is that normal or I’m missing something?
are you saying that the ambient air temperature is 80F (so barely over normal indoor room temperature) and the unit is not functioning properly? This AP does not have an internal fan. Does the unit function properly when the air temperature is below 80F?
Unit functions perfectly if the ambient temp is less than 80F.
It was woking fine for 3+ months, and it’s only few days when temperature started to raise during the sunny days (Florida). Once room temp gets over 80F (never over 81F), it locks up in an hour or two.
Also it does have the internal fan for sure.
My guess is that I would have to remove labels, unscrew the mainboard and see if any thermal compound needs refreshing. The upper plastic part is removable with 4 unsealed screws and there is a fan in the center of the unit.
If I would re-plug it immediatly, whle it is still hot, it would be stuck in the bootloader forever.
(status led green, all IAP leds orange+green)
I think it is a manufacturing defect for this exact unit.
There is no thermal pad between the CPU and metal heatsink, that is mounted on the plastic case.
Given there is a pocket on the heatsink part - CPU is not even touching it.
Yes, 3 other units run fine.
I would just add a thermal pad, between the CPU and heatsink, as it is open anyway.
If I were Cambium engineer I would probably want to implement a hardware watchdog (in future models), that would remove power from IAPs, if main CPU has failed. Otherwise wireless clients are stuck connected without network.