• Please note, some of the links on our site are affiliate links (Learn More)

FIXED Samsung RF28HMEDBSR Main Refrigerator Compartment Rarely Gets Below 40 deg F

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
Model Number
RF28HMEDBSR
Brand
Samsung
Age
6-10 years
I have been battling this for months, hoping for some ideas--

Symptoms:
Fridge temp set to 34 deg, temp display on door reads 34 deg, actual internal temp of main compartment (as read by 2 digital thermometers in various locations) typically between 40 and 48 deg even after doors have not been opened for hours. This morning when I got out of bed, door temp read 34, actual internal temp was 46. Freezer and food drawer are fine, actual temp of -2 & 36 respectively. Every now and then main compartment will hit 38, but rarely.

Should not the temp displayed on the door (after the fridge has not been touched for hrs) be pretty close to the actual temp? After powering down to replace components (see below), I set the temp for 34. The temp as displayed on door will then reflect the actual temp--i.e. 60s' after I have had the fridge off, then I will watch it step down through the 50s', 40s', all the way to 34. At the same time, the actual temp as read on digital thermometers will never get below 40. Once the reading on my door hits 34, I can reopen the doors, leave it open for several minutes and the door reading will still say 34--it will never move again. Is this not the problem?

What it does NOT appear to be:
-I have removed main evaporator panel a few times, no excessive ice build-up on coils or around fan, so I am thinking it is not defroster and/or defrost sensor.
-I checked the fan & main temp sensor (the one inside the panel cover) and they checked ok, BUT, I replaced anyway since I was not sure how efficiently the fan might have been working being close to 10 y/o. I checked the sensor by ohming
it out at room temp, and in ice water. Readings were consistent with Samsung's published figures. I replaced it anyway, just because I already had the panel taken apart, and because of what I was seeing with the door temp always reading 34.
-all door seals appear fine, no cracks or obvious problems, proper clearances around fridge. Again, the issue is NOT opening the doors too much as the temp is often in the high 40s' 1st thing in the a.m. after being shut several hrs.
-no excessive heat or sunlight; it was 60 this morning when the main compartment was reading 46 after sitting all night.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
Should not the temp displayed on the door (after the fridge has not been touched for hrs) be pretty close to the actual temp?
Correct.

Here's the parts diagram for your model:

You have two temperature sensors in the refrigerator section, 5-1 and 6-1 in the parts diagram.

5-1 is this one: DA32-10104N

6-1 is this one: DA32-00011D

Which one did you replace?

Jake
 

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
Hi,
I replaced DA32-00011D (6-1) The way I understood it was that this one was the temp sensor that regulated the temp in the main food compartment, and the other one (DA32-10104N) controlled the defrost. Since I didn't appear to be icing up, I (maybe wrongly) assumed -00011D was more likely to be the issue.

Is it normal for the door temp reading to be so far off and so non-responsive on these things as I described in my original post? (even when doors are left open for several minutes it still reads 34 degrees--which is the temp I set it for) It seems like that could certainly cause what I'm seeing. Never having been around another similar Samsung fridge--I'm not sure if maybe the door temp reading is always just hoaky on these things, and my problem is something with the refrigerator's ability to cool rather than sensing the wrong temp?

Here's a link to a quick video:

Starting temp on the digital thermometer is with the refrigerator set for 34 deg, and doors not being open for at least 6 hrs. I only left the doors open a few seconds here, just to keep vid short--but I could have left them open for several minutes and the door temp would still read 34. I'm guessing door reading might never be quite as responsive as a digital thermometer, but it NEVER goes up (unless fridge is powered down and allowed to come to room temp, then, when powered on, it will begin reading down from room temp--once it hits 34--or wherever fridge temp is set--it never goes up again under normal conditions )
 

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
Oops, sorry. I didn't see in your original response where you replied directly to my question about "Should not the temp displayed on the door (after the fridge has not been touched for hrs) be pretty close to the actual temp?" I didn't mean to beat a dead horse there with my response and the vid. So yeah, I replaced DA32-00011D, and the door temp reading & fridge is still behaving as I described.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
No worries.:)

Did you ohm test 5-1 this one: DA32-10104N

Rick posted the resistance/temperature chart here:

Jake
 

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
Hi Jake,

Nope, I did not ohm that one out or replace it.

Now I may have this completely wrong (probably do!) but, assuming my external temp always being too low is likely a symptom of my problem (which it sounds like it is) can that sensor (-10104N) even cause that?

I noticed that sensor was connected directly to the evaporator coil (or heater, forget which now). I assumed the sensor I replaced was the main thermistor for the food compartment which monitors and reports the temp, and -10104N controls when the defrost heater comes on/off. I had no icing up or anything like that, and if the heater was just stuck on or coming on too often (or something crazy) wouldn't my external display show the compartment as too warm? (if working correctly)

Maybe it's not as clear-cut as that, and there is some interplay between those two sensors? Do you know, IS thermistor -00011D in fact the sensor which the external display uses to report the temp? Also, the sensors must output somewhere 1st--to a motherboard or something? Can it be possible that my sensor(s) are fine, but whatever electronics that convert that output to a temperature is messing up? Have you ever seen that?

But yeah, if you are thinking it is still possible for that other sensor -10104N to cause what I am seeing, I can rip it apart again and try ohming it out and/or replacing it. I'm sure it's cheaper than a motherboard! haha.

Thanks for the help,
Anthony

p.s. I have noticed that when I go to Power Cool, I can get the actual temp (as per my digital thermometer) to 36 - 38 deg, and my external display goes down to 29. Not sure how long it's wise to leave it in that mode, but I have been doing it several times a day for like 30 min. At least it keeps my food from spoiling. So very odd, my front display temp is consistently like 7 - 10 deg too low, and it will go lower than 34 deg (still with the 7 - 10 deg diff), but NEVER higher than 34 deg, unless the fridge is turned off a starts from room temp.
 
Last edited:

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
Those are good questions Antony, but I don't have those answers as I rarely work on Samsung appliances in the field.

Hopefully another tech that works on Samsung refrigerators "day in and day out" can answer that for.

Here's the service manual for your model: https://drive.google.com/file/d/19vxtD6anfrds72r-uePO6_hXbfnlOkdm/view?usp=sharing

But yeah, if you are thinking it is still possible for that other sensor -10104N to cause what I am seeing, I can rip it apart again and try ohming it out and/or replacing it. I'm sure it's cheaper than a motherboard! haha.
That's exactly what I was thinking.:)

Jake
 

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
I finally did get this fridge working much better--pretty much steady between 34-38 deg (with the door shut overnight) and door temp set to 35

I ripped it apart yet again and replaced that other sensor--the defrost sensor. No change. I figured I was down to the main PCB as the only thing left.

I ended up taking a more in-depth look at the Service/Troubleshooting via the link you had sent. Thanks again for sending it! It's written a bit funny, translated from Korean probably. I had looked before for some way to "calibrate" the sensors but didn't see anything. This time--being down to my last straw probably--I did notice pushing/holding Alarm+Fridge puts you in a series of sub-menus where you can change a bunch of parameters; one being "fresh food temp shift". When I did this, my parameter was set to 9 (+2 deg) as per page 70 of the manual. Since I was always off about 8 - 10 deg (34 set at door, 42 to 44 actual temp) I changed the # to 7 (-7 deg).

For the past 5 days, every morning when I come downstairs I check the temp and it's been great--I even had to adjust the temp on the door to 35, cause I was hitting 32 on my digital thermometer. I haven't seen that forEVER, so I think that did the trick. Also, with what I was seeing; No icing up, fan was verified to be working, main thermistor ohmed out good/replaced. defrost sensor replaced; FRidge proved to be capable of cooling because it would cool well below 40 when I pushed Power Cool; this adjustment seems pretty logical.

Thank you again for the help and for sending the Service Manual. Probably saved me a few grand as I was ready to junk this thing and buy a new one!
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
Excellent Anthony, glad you found that "fresh food temp shift" setting and that seems to have fixed it.(y)

Thanks for the update, that will help others too.:)

Paying it FORWARD is ALWAYS GOOD KARMA!

Jake
 

JRyu

Premium Member
Joined
Oct 3, 2022
Messages
6
Location
Toronto, Ontario, Canada
Should not the temp displayed on the door (after the fridge has not been touched for hrs) be pretty close to the actual temp? After powering down to replace components (see below), I set the temp for 34. The temp as displayed on door will then reflect the actual temp--i.e. 60s' after I have had the fridge off, then I will watch it step down through the 50s', 40s', all the way to 34. At the same time, the actual temp as read on digital thermometers will never get below 40. Once the reading on my door hits 34, I can reopen the doors, leave it open for several minutes and the door reading will still say 34--it will never move again. Is this not the problem?
The Temp display on the front panel is not actual temperature. It is setting temp. It never changes itself automatically if you do not change it yourself. You can find it in the user manual temp setting page.
 

anthony185

Premium Member
Joined
Aug 18, 2022
Messages
7
Location
MA
The Temp display on the front panel is not actual temperature. It is setting temp. It never changes itself automatically if you do not change it yourself. You can find it in the user manual temp setting page.
Yeah, that front door temp display is odd for sure (at least on my fridge) but I'm not sure what you said is true. Here is how mine acts:

NOTE: during troubleshooting I replaced defrost sensor, main compartment thermistor sensor, that whole Condensor cover assy w/fan-only because I busted the crap out of it removing it so many times--the door temp display never changed its behavior with any of these new parts.

-after power down, and powering back on--I'd hit Fridge button on main display to set Fridge temp to 34--after like 5 seconds, display goes off. Hit any button on display OR open door-- now panel temp would read like 65 (room temp) hit Fridge button, and it would read 34 (my setting), hit repeated to set temp--display goes out in 5 seconds. Come back 30 minutes later, hit any button on display, temp would read like 55, 30 minutes later, 50, and so on for several hrs until temp on door display reached my setting (34). So, without doubt, the door temp display was showing a "reading" and not the "setting" at this point.

-Now, I can open the doors for like 5 minutes to where my digital thermometer reads 50+, and the door temp still reads 36--so it does appear now that the door temp never stops showing the "setting"

I'm anything but an expert, I only have experience with my refrigerator, but I spent months dicking with this thing. After messing with that "fresh food temp shift" adjustment over a month ago, my refrigerator has been perfect. I have it set for 36 deg, everytime I walk by it, by force of habit now, I glance at the digital thermometer (not the door temp, but the one I placed in it, with an external display) and the temp has been between 35 - 38 deg every time. I'm not quite sure if what I did was a work-around or a fix--but I don't care. My food is not spoiling and I don't have to shell out thousands for a new refrigerator!

I did browse back in the manual for my model, and I did not see where it expressly says that the displayed door temp is the SETTING and not the actual temp. On my refrigerator at least, it appears like the door temp is showing the temp "reading" until it reaches the temp setting for that 1st time, then just latches there and stops showing the true temperature.

It could be that I have a flakey main board, or the door display is REALLY sluggish and I didn't leave the doors open long enough, I dunno. I'd be very interested to know if someone else as any input on how their front door temp display acts, or they know (for sure) how it SHOULD act.
 

JRyu

Premium Member
Joined
Oct 3, 2022
Messages
6
Location
Toronto, Ontario, Canada
Yeah, that front door temp display is odd for sure (at least on my fridge) but I'm not sure what you said is true. Here is how mine acts:

NOTE: during troubleshooting I replaced defrost sensor, main compartment thermistor sensor, that whole Condensor cover assy w/fan-only because I busted the crap out of it removing it so many times--the door temp display never changed its behavior with any of these new parts.

-after power down, and powering back on--I'd hit Fridge button on main display to set Fridge temp to 34--after like 5 seconds, display goes off. Hit any button on display OR open door-- now panel temp would read like 65 (room temp) hit Fridge button, and it would read 34 (my setting), hit repeated to set temp--display goes out in 5 seconds. Come back 30 minutes later, hit any button on display, temp would read like 55, 30 minutes later, 50, and so on for several hrs until temp on door display reached my setting (34). So, without doubt, the door temp display was showing a "reading" and not the "setting" at this point.

-Now, I can open the doors for like 5 minutes to where my digital thermometer reads 50+, and the door temp still reads 36--so it d
I know there is two kind of temperature display on the control panel. Type 1 : Setting temp display. Type 2: Setting temp display + actual current temp.
Your refrigerator is Type 1. It doesn't show actually temp.
oes appear now that the door temp never stops showing the "setting"

I'm anything but an expert, I only have experience with my refrigerator, but I spent months dicking with this thing. After messing with that "fresh food temp shift" adjustment over a month ago, my refrigerator has been perfect. I have it set for 36 deg, everytime I walk by it, by force of habit now, I glance at the digital thermometer (not the door temp, but the one I placed in it, with an external display) and the temp has been between 35 - 38 deg every time. I'm not quite sure if what I did was a work-around or a fix--but I don't care. My food is not spoiling and I don't have to shell out thousands for a new refrigerator!

I did browse back in the manual for my model, and I did not see where it expressly says that the displayed door temp is the SETTING and not the actual temp. On my refrigerator at least, it appears like the door temp is showing the temp "reading" until it reaches the temp setting for that 1st time, then just latches there and stops showing the true temperature.

It could be that I have a flakey main board, or the door display is REALLY sluggish and I didn't leave the doors open long enough, I dunno. I'd be very interested to know if someone else as any input on how their front door temp display acts, or they know (for sure) how it SHOULD act.
I know there is two kind of temperature display on the control panel. Type 1 : Setting temp display. Type 2: Setting temp display + actual current temp.
Your refrigerator is Type 1. It doesn't show actually temp. It shows setting temp of ref, side & freezer side.
 
If you feel that you have benefited from this site, and would like to show your appreciation.
Top