Jump to content
Click here to check out this guide

FAQs | Repair Videos | Academy | Newsletter | Contact


DISCLOSURE: We may earn a commission when you use one of our coupons/links to make a purchase.
  • Upcoming Events

    • 30 March 2024 02:00 PM Until 03:00 PM
      0  
      All Appliantology tech members are invited to join in this workshop on all things Appliantological: bidness, customers, tools, troubleshooting, flavorite brewski, whatever. Webcams and microphones are open and live!
      This workshop is also a great time for any students at Master Samurai Tech to bring any and all questions about the coursework. We're happy to walk through any concepts you're having trouble with. Think of it like office hours with your teachers. 
      If you have a specific appliance problem you'd like us to talk about, post it here! We need a problem statement and a PDF of the tech sheet or schematic so we can all see it on screen share. If you have a PDF that isn't already in the File library here at Appliantology, send it to us by attaching it to the contact form. 
      Also, follow this Calendar Event so you'll get notified of new posts here. Look for the "Follow" button either at the top of the topic on desktop or below the topic on mobile.
      Who: This workshop is only available to tech members at Appliantology.
      When: Saturday, March 30 @10:00 AM Eastern Time.
      Where: Online via Zoom
      How:
      Click here to go to the forum topic with the registration link. If you're interested, register now. Arrive a couple minutes early to make sure your connection is working. Set a reminder for yourself for this workshop so you don’t miss it.  And check out past workshops here: https://appliantology.org/announcement/33-webinar-recordings-index-page/

KFIS29PBMS01 both FC and RC don't reach set temperature


max999

Recommended Posts

3 hours ago, max999 said:

the pressures are 5PSI and 140PSI

Lowside should be 0 psi. Did you home the 3-way valve for servicing?

Link to comment
Share on other sites

Could it be that  the freezer is defrosting too often and not allowing the freezer to reach the set temp of 0F and lower? I know I did set the defrost cycle to basic defrost,  in the diagnostic , which is every 8hours. What do you think? 

also, Since the cover in the back of the fridge was off I tough air from the condenser fan is not cooling the compressor/condenser fast enough so I added a external fan and I noticed improvement overnight, the freezer was at 5F. Is it possible that the compressor is not efficient? And can’t compress the liquid gas well enough? 

again the compressor pressures equalizes very fast when off so I don’t think it’s floating restrictions,  
 

what about compressor thermal overload ? That too wouldn’t allow the freezer the set temp. how can I tell if the compressor is off due to thermal overload or off because it’s in defrost mode ? 

Link to comment
Share on other sites

I  noticed , that when the  compressor is off the temp in the freezer rises (fridge is s fine )meaning that it is in defrost mode.  I checked the inside of the freezer and I can hear water drop Sizzling on defrost heater. So I don’t think it’s compressor thermal overload.  

I think this is a new problem, and it may be the main board issuing defrost too often, what do you think? 

The equalized pressure when the compressor is of is 35PSI , what is normal equalized pressure? 

I’m  not going to give up until I understand what is wrong with this expensive fridge. 

Link to comment
Share on other sites

4 hours ago, max999 said:

Could it be that  the freezer is defrosting too often and not allowing the freezer to reach the set temp of 0F and lower? I know I did set the defrost cycle to basic defrost,  in the diagnostic , which is every 8hours. What do you think? 

Shouldn't be a problem, recovery from defrost should only be about 15 to 20ish minutes of run time.

52 minutes ago, max999 said:

I  noticed , that when the  compressor is off the temp in the freezer rises (fridge is s fine )meaning that it is in defrost mode.  I checked the inside of the freezer and I can hear water drop Sizzling on defrost heater.

Wonder if the defrost heater is on all the time. If defrost is set to every 8 hours the heater shouldn't be on when the compressor stops running. Easy test is to check the voltage and amp draw of the heater.

Link to comment
Share on other sites

The label on defrost bi-metal sitting on The freezer evap suction line read L48-30F. Which mean it closes under 18F and open above 48F.
Is it the correct bi-metal ? What should be the correct freezer bi-metal open/close temps ? 

So is it possible, as you indicated , that the heater is on all the time and main board think it’s time to defrost? 
The temp in the freezer goes from 10 to 28F when it is on defrost.That hot too fast , right?  and it means the compress has to work hard to bring it back down. So if it a defrost problem , what is the correct way to diagnose it? 

Link to comment
Share on other sites

1 minute ago, max999 said:

what is the correct way to diagnose it? 

 

22 minutes ago, Vance R said:

Easy test is to check the voltage and amp draw of the heater.

I'll quote myself, measure the heater while the compressor running.

6 minutes ago, max999 said:

The label on defrost bi-metal sitting on The freezer evap suction line read L48-30F. Which mean it closes under 18F and open above 48F.
Is it the correct bi-metal ?

yes

Link to comment
Share on other sites

I attached a current probe to measured the current the heater when compressor is on and it reads zero amps, meaning no voltage to heater.  what else can I try? 

 

Link to comment
Share on other sites

1 minute ago, max999 said:

what else can I try? 

It just means no amp draw, if the bi-metal is open  and voltage is present without a complete circuit there will be no amp draw.  According to the tech sheet check for voltage on main board P2 pin7 to P1 pin2 for 120 vac.

 

Your picture doesn't pull up.

Link to comment
Share on other sites

Ok, can see it now. Looks about 3/4 frosted which could be ok depending on how long the compressor had been running. Let's the frost, moisten your finger and touch the frost in several places. Start near the capillary tube. Let me know the results.

Another test since the evap cover is off, use a damper paper towel and touch the defrost heater to see if it is warm/ hot.

Edited by Vance R
added test 2
Link to comment
Share on other sites

so, I did probe P1-pin2(blk-wht)/P2-pin7(pk) wires when the compressor is on and read 0V , the freezer temp is 9F , pressure are 1PSI/140PSI and I sent frost pic again. 

thanks

freezer_forst2.jpg

Link to comment
Share on other sites

should there be 120V at P1-pin2/P2-pin7 all the time or only when the main board the defrost timer (8 hours) kick in? should experiment with the fridge timer defrost setting. the option for step 38 in the diagnostic are OF,Lo,Sh; I don't  know what they mean.

I did check and moment it is at OF, which mean it is OFF, last time I checked it was set to "Sh"

Link to comment
Share on other sites

5 minutes ago, max999 said:

should there be 120V at P1-pin2/P2-pin7 all the time or only when the main board the defrost timer (8 hours) kick in?

Only when the board put the refrig into the defrost mode.

  • Thanks 1
Link to comment
Share on other sites

well something very interesting , every-time I enter diag mode step 38(Forced Defrost mode)  it always shows OF , no matter what i set it to. don't no why. Step 6(bi-metal test) read 01 meaning the bi-metal is making contact. Like I said I could swear that earlier today I could hear the heater sizzling when water droplet falls on it, now I'm confused on what is going on. The freezer frost is starting to build up on the coils 

Link to comment
Share on other sites

since I have the volt meter connected to   P1-pin2/P2-pin7 , i noticed it reads 120V and there 3.7A current draw. so it is defrosting Ok . so I think the defrost works fine. correct?

 

Link to comment
Share on other sites

question, when I set the freezer set point to -5F , the actual temp range between 1F and 25F. the 25F is due to defrost mode which is normal, the temp in the freezer will right that high to melt all the frost of the coil, right? 

and when I set the freezer set point to 5F the actual temp range between 10F and 25F. so something is going on with the set point and what the freezer thermistor thinks its reading, correct,? 

BTW, i have not seen the low side going to vacuum any longer, its between 0-1PSI. so I assume it has the right amount of refrigerant. correct? 

Link to comment
Share on other sites

Question, If the system is overcharged   could it explains why the defrost issue with the freezer not reaching set point temperature? Or maybe I’m over thinking the freezer problem, and it all normal. 

Link to comment
Share on other sites

4 hours ago, max999 said:

question, when I set the freezer set point to -5F , the actual temp range between 1F and 25F. the 25F is due to defrost mode which is normal, the temp in the freezer will right that high to melt all the frost of the coil, right? 

and when I set the freezer set point to 5F the actual temp range between 10F and 25F. so something is going on with the set point and what the freezer thermistor thinks its reading, correct,? 

BTW, i have not seen the low side going to vacuum any longer, its between 0-1PSI. so I assume it has the right amount of refrigerant. correct? 

Sounds like it’s working. You may have a sensor out of spect or you temp measurements are a tad off. Depends on where and out your taking measurements.

Link to comment
Share on other sites

 

27 minutes ago, David C said:

Sounds like it’s working. You may have a sensor out of spect or you temp measurements are a tad off. Depends on where and out your taking measurements.

 

That is true , it possible it’s where I’m taking the reading with remote temp sensor. I will reposition the sensor. 
Btw , I did measure freezer thermistor and the resistance was right on the money. 

If the system was overcharge , it will not cause freezer defrost issue , right ? 
if so I have been overthinking the temperatures too much, because I saw defrost causing temp to rise by 25F and it is Normal. 

I hope it stay like this in the next few days. Thanks for all your knowledge. 

Link to comment
Share on other sites

On 10/9/2021 at 1:04 PM, max999 said:

so I think the defrost works fine. correct?

yes

 

4 hours ago, max999 said:

If the system is overcharged   could it explains why the defrost issue with the freezer not reaching set point temperature?

Not so much a defrost issue, the evaporator should run at -15 deg f to get a 0 deg f freezer. We are coming back to operating pressures. The lowside should be at 0 psi to get evap to -15 deg f.

Link to comment
Share on other sites

With respect to the low side pressure , I understand that when a system is charged correctly, pressure should be at 0psi , but when the compressor changes speeds I noticed that low side pressure fluctuate and that is normal right? It can’t be at zero at all time . And when the compressor is off the pressure equalizes not at zero.
In a functioning fridge what should be the pressures at all time throughout the fridge cycle? .  

so, maybe my system is overcharged a little , since it never sits at zero , it’s at  1-2 psi 

Link to comment
Share on other sites

15 minutes ago, max999 said:

but when the compressor changes speeds I noticed that low side pressure fluctuate and that is normal right? It can’t be at zero at all time

yes, it should be around 0 psi when running full speed.

18 minutes ago, max999 said:

In a functioning fridge what should be the pressures at all time throughout the fridge cycle? .  

The easy answer is it will change depending on heat load and compressor run speed. 

 

19 minutes ago, max999 said:

so, maybe my system is overcharged a little , since it never sits at zero , it’s at  1-2 psi 

 Did you charge by weight or pressures?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...