So here is my situation. About 4 weeks ago I tested my AC and and everything functioned correctly. Now I am getting ready to take it out for the weekend and the AC isn't working properly. The compressor kicks on and runs as it should, but the blower motor doesn't run. (See pics below for reference)
Info on the unit:
Duo-Therm Model 57915.621 with an Easy Start from MicroAir installed. Trailer is a 1994 Classic 300 (AC is as old as the trailer from what I can tell)
What I have done so far:
1. To eliminate thermostat wiring I jumped the wires at the unit. I can hear the relay for the fan click. There is a slight hum, but not a loud buzz or a chatter from the relay that would make me think it is toast.
My thoughts on trouble shooting and what it could be:
1. The capacitor for the blower motor could be out. I haven't opened up the roof top unit yet, but I am hoping to see a swollen capacitor I can replace. However, with the EasyStart installed you remove the "Start" capacitor but leave the run capacitor. I am not sure if the start capacitor is just for the compressor or if it is also used for the blower motor. Since the compressor works still, does this point to this not being the issue. Here are the install instructions for the EasyStart if it is helpful for reference. http://microair.net/main/products/ma...Penguin_II.pdf
2. The fan motor is out. To test this I can use my meter to make sure it is getting voltage when calling for fan. I may also be able to tell if the motor gets hot while trying to run. Do these go out often? There wasn't any signs of it going our last time I used it......no increased noise, slow start etc.
3. It could be the relay in the control box. If the motor isn't getting any voltage, then this is where I would think. I haven't opened up the control box yet, so I don't know if it is a separate replaceable relay or if it is built in to a control board that would need replaced.
Here is the wiring prior to install of the Easy Start.
Anything that I am missing or any other ideas? I guess on the bright side it is only supposed to be in the low to mid 70's this weekend, so having no AC wouldn't be terrible.