can i do anything to diagnose duo-therm dometic penguin?

i do appreciate your help, guys. martha got these from the big label in the air intake area shown in the OP pic

Part # 3107541.009
Serial # WA 657779

Ivylog wrote:
You need to remove the top cover and inspect the larger of the two capacitors. Even if it looks OK I would start by replacing it.. $15 on Ebay by just matching the numbers.

Agreed. Inspect with the power OFF, and short the terminals together with an insulated tool (like a plastic handle screwdriver) before you handle them. If you can find the fan motor wires, just momentarily disconnect them and have your helper put the power back on and set the system to COOL. See if anything happens. You should hear the compressor hum, feel a little vibration, and notice that the small copper tube from compressor is getting warm. That and the larger tube is getting cool.
Post the complete Model Number and we'll try to look up a wiring diagram.

You need to remove the top cover and inspect the larger of the two capacitors. Even if it looks OK I would start by replacing it.. $15 on Ebay by just matching the numbers.

thx, ron, i will keep that in mind as i progress...

what seems to be called a 'freeze control sesor' dropped down and i do not know if i just caused it or if it happened in past.



it appears to need to be clipped to something related to the coils directly above it (loosely gleaned from some discussion group), so i put it on a copper coil loop ----(right, wrong?)

the 3 amp fuse from hre looked OK



a pic of thermostat

Is your problem that the fan is running when it oughtn't, or that the compressor isn't running when it ought? Naturally if the thermostat is set to a temperature higher than the ambient temperature, the cooling unit should not run; and it's entirely possible (and good) that there's a delay of a couple minutes before it will let the A/C start up again after it shuts off to let the pressures in the cooling system equalize.

If you think the fan should shut off, perhaps the thermostat has a fan switch set to "on" rather than "auto." It's also possible that the fan may automatically run for a little bit after the compressor shuts down since the evaporator is still cooling for a bit...I don't recall if my Duo-Therm does, and even so it would not be a direct comparison as it's a different and older model.

One of the Super C Group members had a similar problem. He found that a capacitor had a loose connection. This caused wire before connector to burn off. Replaced wire and connector. All was good again.