Compressor not working how to check - Maytag M3DH30B2A Dehumidifier

check that the tank isn't full or the outlet hose is not blocked. Remove the filters and clean if required.

Turn the unit on and put you hand on the copressor to see
if it's vibrating. If so then it could be low refrigerant or a worn
compressor.
If it's not vibrating then I would check the thermostat,
compressor relay, and compressor for continuity.

If the compressor and the fan are working then the next thing is to make sure The entire unit is cleaned . This may require you to diassemble the unit . The refrigerant Coils must be clean in order for the compressor to shed heat and propperly function. Once the unit is cleaned out thoroughly, if you still have problems you could be low or Out of refrigerant. If so it usually does not make financial sense to replair these unless It is a very expensive(over$500) model. You would be better off to replace it.

what ever you doo just stand it back up for 24 hrs after work is done

If both the fan and compressor are going off the problem would be in the low voltage side a safety is opening. Probably low on refrigerant. You need to check refrigerant pressure when the unit is starting, if the pressure drops below 60 psig the low pressure switch will open and shut the compressor and fan off.
You really need to have a service technician check the system out for you.

i would do a continutity check on you relay and overload, other than that
what is the humidity level in the room, as well as the ambiant temp. these mahines cycle for that very reason, the fan will come on, do a check and then determine if it should start the compressor.
check if you have voltage at the compressor when its supposed to be running ( just a last thought)
ive seen compressors ohm out, but in fact be bad

Assuming this is the A/C compressor, right? The compressor will be hot to the touch, the question is whether or not it is engagining when turned on, Check to see if the compressor clutch iis working by having someone turn it on and off while listebibg an observing the compressor clutch. Low refrigerant would or should orevent compressor operation to protect the compressorthrough a safety switch. Good luck

Possible low on Refrigerant. Get tech to check it. Rusty

My Kenmore had the problem of the fan running, but not the compressor. The compressor overload part was bad.

Togarba