Friedrich md.em24m34-a all the fan relays on control board are fried what can cause this

need to verify the motor is getting voltage to the low speed tap. if so, bad motor. if not, find where the voltage stops. switch or relay!

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Does the unit cool ok? If yes, you likely have a problem with reversing valve. If no, likely a refrigerant problem.

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bad thermostat.

Most times the motherboard is the problem that causes the solder to melt from a defective relay. You will need to inspect the compressor start relay and capacitor to insure that they did not cause the relay on the board to overheat. Also check that you have 12 volts dc going to the evaporator and condenser fans while running because if for some reason the fans are defective and you change the motherboard while one of the fan motors are defective your new motherboard again can be damaged. Here is a link to a=> Artica/Profile Service Manual

Here is a motherboard test photo=> Artica Profile Tech Sheet I will be glad to help answer any questions you may have Thanks Sea Breeze

sounds like its wired up wrong

Must be a bad oven control. Looking at the wiring diagram I see a hot wire from the power terminal to the fan and onwards into the ovencontrol. Must be a fried relay on that control board. Ya might want to remove the control and look for signs of failure.

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hello
you select manual speed fan for test step by step.(speed;1-2-3)
maybe relay (1-3) damage .

Hooked on phonics?

the refrigerant leaks or the thermostat is not working. i also got the same same problem and have the thermostat replaced by a technician

If the electronics got fried in the same place then you obviously have a fault cauing the board failure. If the compressor relay was burnt out then it would seem to suggest the compressor as a possible cause. If the board is now back to par then I would suggest checking the incoming voltage to the board and when restarting the unit first disconnect the power going down to the compressor from the board. Make sure everything else works OK first. If everything is running I would sugest checking the relay on the compressor body for any damage or burn damage on the compressor windings. If everything looks Ok then I would reconnect the compressor and try again. Personally speaking though I would really encourage you to get a professional to check the system through as you dont want to keep blowing up boards, let someone else do it and be responsible for it. Hope this is of some help.