Mini Split Powers Up On It’s Own

[Skiff Builder]

I have a power issue with a Samsung 22k btu with inverter.
3 heads- 7/7/9k

System works well for cooling and heat in normal operation.

Issue occurs whenyou shut off the breaker or lose power from the street. When power is restored one of the heads turns on in sort of a standby mode and blows air. The other 2 heads remain off ( which is normal I assume).

No big deal if your there but when away for 2 weeks it’s no good.

Any ideas on troubleshooting appreciated.
Thks Skiff Builder

 

[mobiledynamics]

No answer for you on this. The behaviour on a Mr. Slim if I recall is if it loses power DURING a particular mode (whether it be heat or cooling), it will RESUME said mode when power resumes.

I recall this as the breakers were being flipped off/on when the system was getting rewired/reconnected

 

[Skiff Builder]

I should say that even if the unit is off, if power is lost or breaker thrown, the one head will turn itself on when power is restored.

 

[Done That]

On power restore is it on immediately, or a bit of a delay and then comes on?

Controls sometimes use latching relays to minimize power use, but they rely on one or more capacitors to hold enough power to unlatch when a power interruption is sensed.

 

[Skiff Builder]

Done That,
Just tested. Started with Sys off. Breaker switched off. Breaker on- same head unit started immediately.
I don’t think I understand how the latching caps work.
Thanks
Skiff Builder

 

[Done That]

The relay that turns on the blower might have a mechanical latching armature. The caps just hold power. When the micro sees a power interrupt, it quickly tries to shut everything down before power is gone, the caps just provide supplemental juice to make this happen. Hope that makes sense.

And I'm just hypothesizing what might be happening based on your description. A relay that is starting to fail could be sticking shut, causing a blower, compressor etc to come on when its not supposed to.

 

[Done That]

Sometimes you can tap on a relay that you suspect is sticking/failing with a screwdriver handle and free the contacts up....at least that confirms where you have the problem.

 

[justinjoyal]

Samsung. That’s your problem right there! [emoji51]

 

[Skiff Builder]

Sometimes you can tap on a relay that you suspect is sticking/failing with a screwdriver handle and free the contacts up....at least that confirms where you have the problem.

Ok. Got it. Once our 60 mph gusts die down I’ll get out there and check em out. Really appreciate it, Thks.

 

[Skiff Builder]

Samsung. That’s your problem right there! [emoji51]

Justin, please tell me more about Samsung. First ac system I’ve ever owned. Was able to install it ok, but not familiar with the inner working so much.
Thks
Skiff Builder

 

[justinjoyal]

Justin, please tell me more about Samsung. First ac system I’ve ever owned. Was able to install it ok, but not familiar with the inner working so much.

Thks

Skiff Builder

Well, I don’t have first hand experience with them, but I have heard mixed opinions. A lot of those suggest Samsung should stick to making TVs...

But as I said, I don’t deal with Samsung hvac products.

 

[Skiff Builder]

Well, I don’t have first hand experience with them, but I have heard mixed opinions. A lot of those suggest Samsung should stick to making TVs...

But as I said, I don’t deal with Samsung hvac products.

Right. GMC, Ford, Dodge

I'll let you know how this issue works out. System was commissioned two years ago( 40' from saltwater).The above issue is the first hiccup.

Wife got the entire setup free from local distributor. She designed/ sold him 6 bath remodels on 2 of his personal properties. Nice tip huh?
Personally I could do without any AC( anywhere) and would probably never buy one myself, but happy wife, happy -you know the rest.

 

[PoorOwner]

Sound like the system is fairly new, have you tried to ask Samsung what if that is normal or not?

 

[Skiff Builder]

Gentlemen,
Again thanks for your responses on my Mini Split problem.
It was an I.O.D. Error

Idiot On Device!
I learned about the "restart after failure" option. Seems the problem head had this option set on whereas the other two did not.Appears to engage even if unit is off during failure...

 

[u3b3rg33k]

Gentlemen,
Again thanks for your responses on my Mini Split problem.
It was an I.O.D. Error

Idiot On Device!
I learned about the "restart after failure" option. Seems the problem head had this option set on whereas the other two did not.Appears to engage even if unit is off during failure...

It's a useful feature for those using it as a primary heating device (or for cooling a closet full of radios/switchgear). glad you got it sorted out.

 

[Fixin'Stuff]

Too bad the programmer of the firmware didn't put a bit more thought into his code. The BIOS in most PC's has the ability to choose what happens after a power failure.

Stay Off
Always Turn On
Always Goto Last Mode (I.e., if system was off, stay off. If system was on, turn back on).

 

[Skiff Builder]

Too bad the programmer of the firmware didn't put a bit more thought into his code. The BIOS in most PC's has the ability to choose what happens after a power failure.

Stay Off
Always Turn On
Always Goto Last Mode (I.e., if system was off, stay off. If system was on, turn back on).

Fixin’Stuff,
Would the programmer you refer to be employed by Samsung or would he be the end user of the product?

 

[Fixin'Stuff]

It's built in to the system. The Samsung coder would have to write the firmware code to give the end user the option of what the system should do after a power failure.

It sounds like your system only has 2 options. 1) Turn on after a power failure (even though it was NOT on before the power failed. Or 2) Don't turn on after a power failure. Just a tad more logic in the code would have given option 3.

You can be sure that the designers assumed that the system would always be in use, and thus option 3 wasn't considered.

 

[Skiff Builder]

It's built in to the system. The Samsung coder would have to write the firmware code to give the end user the option of what the system should do after a power failure.

It sounds like your system only has 2 options. 1) Turn on after a power failure (even though it was NOT on before the power failed. Or 2) Don't turn on after a power failure. Just a tad more logic in the code would have given option 3.

You can be sure that the designers assumed that the system would always be in use, and thus option 3 wasn't considered.

Got it. I will really have to dig into the manuals and see about that 3rd option.
All my focus was on the install (first time for me), challenging but fun. Went on to building the rest of the house, should of paid more attention to the programming.
again, thanks for the help-appreciated.
Skiff Builder