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Subzero 690 fridge freezer. There is about 10 inches of uninsulated suction line leading to the compressor. This frosts up and every few hours defrost

Newswartz

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Joined
Jun 21, 2022
Messages
8
Location
New York
Compressor cycles off ice melts and drips down the back in the floor.
 

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paulhl

Appliance Tech
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Location
Flemington NJ
Cut out for that unit is 1" vacuum. Can you see light thru the condenser, lots of dust in your pic.
 

Newswartz

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Joined
Jun 21, 2022
Messages
8
Location
New York
Cut out for that unit is 1" vacuum. Can you see light thru the condenser, lots of dust in your pic.
Cleaned the condenser its super clean. Replaced the condenser fan last year. I have no idea if the fan inside the freezer is turning on. Was also thinking maybe the wife over packed the freezer with bags and chocked out the airflow. Fridge is 22yrs old but replacement is not an option. Do you think I should lower the pressure to closer to 1-2 or so.
 

paulhl

Appliance Tech
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Messages
242
Location
Flemington NJ
Adding & removing freon is guesswork. To be sure you would have to evacuate, change dryer & recharge. The evap fan is behind the evap which is behind the ice maker. Two switch's up top, left lites, right fan. Again can you see lite thru the condenser(flashlite)
 

Newswartz

Premium Member
Joined
Jun 21, 2022
Messages
8
Location
New York
Adding & removing freon is guesswork. To be sure you would have to evacuate, change dryer & recharge. The evap fan is behind the evap which is behind the ice maker. Two switch's up top, left lites, right fan. Again can you see lite thru the condenser(flashlite)
Although I vacuumed the condenser with the flashlight I can see there is still a lot of dust. I cleaned it with a qtip last year. So I’m going to grab a few cans of compressed air. Also confirmed the fan is working in the freezer.
 

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paulhl

Appliance Tech
Staff member
Joined
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Messages
242
Location
Flemington NJ
In all the years I've serviced Sub Zero I have never seen frost back forming enough water to make it down to the floor. In your case I would check the drain trough in the ref section to see if it's over flowing. Not gonna solve the frost back issue but might be the cause of water on the floor. After 22 years that is remarkably clear
 
Last edited:

Newswartz

Premium Member
Joined
Jun 21, 2022
Messages
8
Location
New York
In all the years I've serviced Sub Zero I have never seen frost back forming enough water to make it down to the floor. In your case I would check the drain trough in the ref section to see if it's over flowing. Not gonna solve the frost back issue but might be the cause of water on the floor. After 22 years that is remarkably clear
Already checked the drain it’s clear. The ice falls off puddles on top and makes its way down under the fridge.
 

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Newswartz

Premium Member
Joined
Jun 21, 2022
Messages
8
Location
New York
In all the years I've serviced Sub Zero I have never seen frost back forming enough water to make it down to the floor. In your case I would check the drain trough in the ref section to see if it's over flowing. Not gonna solve the frost back issue but might be the cause of water on the floor. After 22 years that is remarkably clear
I lowered the pressure to 1.5psi and raised the temp from -3 to 0. It still frosts but not enough to melt and puddle. Seems like a Bandaid for now
 

Newswartz

Premium Member
Joined
Jun 21, 2022
Messages
8
Location
New York
In all the years I've serviced Sub Zero I have never seen frost back forming enough water to make it down to the floor. In your case I would check the drain trough in the ref section to see if it's over flowing. Not gonna solve the frost back issue but might be the cause of water on the floor. After 22 years that is remarkably clear
With a guage hooked up to the freezer I never see the pressure move. It just sits at 1.5. What is the on and off for the fridge? Because the pressure measures 30psi and isn’t moving. Last question. Do you recommend anyone for repair in the Hudson Valley Ulster County NY?
 

paulhl

Appliance Tech
Staff member
Joined
Jul 3, 2021
Messages
242
Location
Flemington NJ
Like I said cutout is 1" vacuum, cut in depends on how long it's been off to equalize. Since you've fooled with adding and removing freon, at this point not knowing if the proper amount is in the system it's impossible to diagnose. If the low side is at 30PSI either the compressor isn't running or if it is it's shot.
 
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