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Old 26-08-2024, 16:03   #1
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Location: Tarpon Springs, Florida
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Dometic STX16-410A Will Not Start

Hello:

I have a Dometic STX16-410A AC on my boat. I turn it on/off by turning on a breaker. The other day I turned it on and nothing... It did not turn on and the instrument panel had not display indicating no power. No motor or fan either. I checked and it was getting power with my multimeter. I assumed it might be the capacitor and got as close to what it had in it.

It had - "45 + 16 uF +/- 10% 370V 50/60HZ"
Replaced with - "45/5uF +/- 6% 370V 50/60HZ"

This did not work. I know it was not a match but closest I could find. Curious if anyone has any suggestions of what could be going on, or how to troubleshoot this.

Any suggestions appreciated...

Harrison - Tarpon Springs, Florida
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Old 02-09-2024, 18:52   #2
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Re: Dometic STX16-410A Will Not Start

Not sure but there is a trigger switch that turns on a water pump. I am wondering if that could be the issue. Anyone understand how it works. This would help me in troubleshooting....
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Old 02-09-2024, 19:12   #3
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Re: Dometic STX16-410A Will Not Start

Not sure why you suspected the capacitor but you can wire capacitors in parallel to add up to the desired capacitance.
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Old 03-09-2024, 07:48   #4
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Re: Dometic STX16-410A Will Not Start

If the display is blank, then it would not have been the capacitor. Put the original one back in. Most air conditioners will tell you what is wrong if a failure exists. It also is not the water pump, a failure in that will not keep the display blank. Usually the display will tell you the water pump has failed.

I would double check the voltage to it. I assume it is 120vac power? Where did you check for voltage? I would check the 120volts at the air conditioner, not at the circuit breaker. Make sure it is 120 volts and not 100 volts, because a low voltage can also be a problem.
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Old 03-09-2024, 09:27   #5
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Re: Dometic STX16-410A Will Not Start

danno7 - Thanks for your reply. All makes sense. I check power right at the control board. I was 115 volts if I remember correctly. A little low, but I think it would be okay. Does 115 volts sound like a problem. With breaker on system is completely dead. No power on thermostat, fan, or compressor....
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Old 03-09-2024, 10:19   #6
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Re: Dometic STX16-410A Will Not Start

If it is 115 volts, that is certainly fine. Even 110 volts should be ok. If it has a low voltage cutoff, it could be about 100 volts. If you have access to the circuit board, sometimes they have a fuse on them. The fuse is not accessible to the novice user, only to repair technicians. Maybe take a picture of the circuit card if you can, and I will see if I see a fuse.

By the way, I am an electrical engineer, so I know a bit about these. I am not aware of any of the details of your STX16-410A, though. The model is obsolete. Do you have the operators manual for it?
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Old 03-09-2024, 10:47   #7
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Re: Dometic STX16-410A Will Not Start

danno7 - I really appreciate you responding. Here are pics I took of the control board. I had to put them on iCloud.

Pics Link - https://share.icloud.com/photos/052X...6BmpFmETDDdS7A

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Old 03-09-2024, 11:15   #8
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Re: Dometic STX16-410A Will Not Start

I do not see a fuse on the circuit board. I assume you are measuring the AC voltage on the black and white wires on the photo. It is the black and whites that are doubled on the connector. That is where you need to measure it.

I have another suggestion. I see in the upper right corner there is some solder points for testing. One says PWR and the other says GND. These are DC voltages. Put your meter in the DC voltage selection and measure these.

Finally, you might try wiggling the cable from this circuit card to the display panel. Watch the display to see if it intermittently turns on when wiggling it. I think it is in the lower right side of the circuit board.
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Old 03-09-2024, 12:44   #9
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Re: Dometic STX16-410A Will Not Start

danno7 - Everything you stated is correct. If I get 0 on the PWR/GND is that a pretty good indication the board is bad? I will be back down there tomorrow and test.
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Old 05-09-2024, 13:36   #10
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Re: Dometic STX16-410A Will Not Start

I see a date code on the circuit board of November 2010. At least you got a few good years out of it. You might be able to get a replacement circuit board from Dometic, or maybe consider a new one. The system is probably cooled with salt water, and they are prone to eventually leak. If the boat is in fresh water, then it could survive a few more years.

My AC had an issue with leaking water, and it was 17 years old. I possibly could have fixed it, but I bit the bullet and got an whole new Dometic.
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Old 11-09-2024, 14:38   #11
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Re: Dometic STX16-410A Will Not Start

The AC is fixed now...

The boat a few slips down from me was hit by lighting and his AC was out. His electrician came over to my boat and helped me troubleshoot. The issue was a fried capacitor, control board, and start assist switch. He had the parts in his truck and was able to fix it right away. I asked him if he thought I got hit by lighting too and he said he did not think so... He thinks the parts were just very old. He charged me for 1 hour of labor ($150) and parts ($400). I suspected the control board but was not sure. Seems if you get no display and no power out for the water pump it is a good indication the board is bad. If I had bought the parts online with cost of shipping they would have been more expensive, so I thought he was very fair.

His name was Wolf Heinly with "Cool Breeze Marine AC & Refridgeration, Inc" in Tarpon Springs, Florida
www.coolbreezemarineac.com.

These are the replacement parts. Hope this helps anyone dealing with this issue.

1. Capacitor
Website - Yachtaidmarine.com
Dual Replacement Capacitor for Turbo units
https://yachtaidmarine.com/shop/mari...84rKrEOgqclZpC

2. Control Board - 288c Logic Board
https://www.microair.net/products/a-...97Tdhj2QnJ-_qE

3. Start Assist Switch
Dometic 335055 Start Assist 370HM PTCR
https://www.boatandrvaccessories.com...ist-370hm-ptcr
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Old 12-09-2024, 10:44   #12
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Re: Dometic STX16-410A Will Not Start

Wow, that is great news. You got a great deal on that repair. As an electrical engineer who has worked on hundreds of circuit boards and designs, his comment about electronics failing because they are old is not at all true. Semiconductors will work fine for a long time. There is nothing in them to wear out. I bought my Yamaha stereo for my home 42 years ago. I brought it home, and plugged it in. I leave it on all the time; just turn down the volume when I want quiet. It has been on and operating fine for 42 years.

That said, other factors can cause a shorter life with electronics. Dust, moisture, a poor design, and vibration effect the circuit card connections. All of these are present for your circuit card. So it could have been one of these issues, or it could have been the lightning.

You got it working! Cool Man... like they said in the 60's.
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Old 12-09-2024, 10:44   #13
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Re: Dometic STX16-410A Will Not Start

I bookmarked those web sites you supplied, thanks for doing that.
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