Replace a heater like this it is an adventure

Thanks for sharing this video! The entire back wall has about a 1.5” thick layer of ice built up. Sometimes I’ve freezes underneath the fan and when it runs it creates a really loud noise. after reading through the comments, I haven’t tried holding the ice maker button to run a manual defrost, but would you think with the amount of ice built up+ the back panel is bent and wrapped pretty severely, that this would indicate a faulty heater? Thanks!

@SubZeroSpecialists

Жыл бұрын

Most likely it’s the heater. Best way to check it is to remove the back panel and check the heater for continuity. If the heater checks out then it could be the defrost termination switch.

@MichaelTchao

Жыл бұрын

@@SubZeroSpecialists thank you!

I have a sub-zero 700TCI and it seems to be going into defrost mode all the time, (guessing hourly?) I don't know what's normal. Once in a while it will either become to hot or too cold. I reset it a few times and it goes back to set temperatures on the screen. What could the problem be? Last year it was blowing out too hot of air and now it's cooler.

@SubZeroSpecialists

6 ай бұрын

I need more information. What are the operating pressures?

Another Great repair. I like that molex tool where did You get it? It certainly makes for a professional job not having to cut or splice wires.

@SubZeroSpecialists

2 жыл бұрын

Waytecwire.com, MX150 & MX150L Terminal Removal Tool

@MrMultitool

2 жыл бұрын

@@SubZeroSpecialists Thanks

Thanks for sharing this video - very helpful! My subzero 736TCI is also making noise due to ice build up in the freezer. Checked for continuity on the two heaters (upper and lower) and they both appear fine (30 and 150 ohm reading). Additionally, manually turning the defroster works (ice on/off button for 5 sec). Would you say it is the defrost terminator switch or the control board? Any tips on what I should check next?

@SubZeroSpecialists

Жыл бұрын

If you have 130v at the heater then it’s not the board. Also jump out the defrost terminator when you check, most of the time it’s the Hester. You should check to see how much amps the heater is drawing.

@SubZeroSpecialists

Жыл бұрын

I meant to say 120V at the heater. You can check my website at aaronsrefrigeration.com under technical data to see how many amps the heater draws. Usually around 3.5 amps.

@AmitVerma-uf6xx

Жыл бұрын

@@SubZeroSpecialists Thanks!! One additional data point - the temperature display is showing 61 for the freezer and 40 for the fridge. That might be the issue (freezer temp recording incorrectly), right? Do we know where the control board is picking the temperature from - is it from the defrost terminator? I'm unsure on where it is - is it visible in this video - if so, can you please point me to it? Appreciate your help.

@SubZeroSpecialists

Жыл бұрын

@@AmitVerma-uf6xx there are two thermistors in the freezer, one attached to the evaporator coil and the senses the cabinet temperature. If your coil is iced up then you’re not going to read the right temps. As a test you could completely defrost the freezer including behind the wall and then turn it back on to see if the temperature normalizes

@AmitVerma-uf6xx

Жыл бұрын

@@SubZeroSpecialists update: replaced the thermistor in the freezer that was reading the wrong temp (displayed in the freezer temp/control board). Also replaced the terminator switch. The issue is resolved. Thanks again for the video and the guidance!!

Nice video. I have 700TR refrige and freezer (side by side). Freezer does not go into defrost mode? During summer nonths it freezes up. I have to turn it off for 30 sec. and then it goes into defrost mode and temp comes down. Any help would be fantastic. I dont know if this matters but ice cube maker does not work. It use to work only in winter.

@SubZeroSpecialists

2 жыл бұрын

You can check the defrost system by holding in the ice maker button in for 15 seconds until you hear a click, that will force the freezer into a defrost cycle. If the defrost heater comes on and defrosts the coil then I would say you have a problem with the control board. I need more info to assist in your diagnosis.

@CarpetCareIncFairfield

2 жыл бұрын

@@SubZeroSpecialists thank you.....

My original 700TCI evaporator freezes up. I checked for continuity on the heating element and get 22 ohms. The sealed system seems to hold temps when I manually clear the coil with heat. Since there is no separate defrost controller, my next step would be replace the entire control board? Thanks

@SubZeroSpecialists

Жыл бұрын

Which evaporator freezer or refrigerator ?

@SubZeroSpecialists

Жыл бұрын

There is a defrost termination switch also part of the defrost system, you’ll need to check that also. If it’s open, meaning no continuity, it could be because the freezer evaporator coil is not pulling down enough in temperature to close the contacts. Also if you can apply direct voltage to the heater and see if it heats up or take an amperage reading. If all that checks out then you can check the terminal for the heater on the control board and see if you get 120V. You can also force it into a defrost cycle by holding the Ice Maker button in for 15 seconds. If it goes into a defrost mode then I doubt it’s the board, but I could be wrong.

@bcollarguy

Жыл бұрын

@@SubZeroSpecialists The original 700tci only has one evaporator. I was able to force a manual defrost via the master power switch cycled off for 10sec. This cleared the ice. I replaced the defrost terminator (inexpensive) just as a precaution. The manual states this early model uses 'adaptive frost' technology since there is no separate defrost controller that was eventually incorporated in subsequent models. So I am not sure what tells the evaporator heater to initiate a defrost in this early model. This was the only reason I was considering changing the board since there is nothing left to change.

@SubZeroSpecialists

Жыл бұрын

@@bcollarguy Adaptivve defrost is based upon how long the heater stays on. You can read about adaptive defrost on our website under tech help, go to 700 series component info.

@fixitfelix718

Жыл бұрын

If you have a meter at the board when you hold ice button for 10 seconds it jumps into a defrost..you can oull the blue wire on the board and check for 120volts coming out of the board at the terminal..put one lead on a white wire and one on the blue terminal on board if you hold ice 5 to 10 second it forces defrost so 120v should come from board...also heater normally is 30 ohms 22 seems low but im not sure

How did you diagnosed faulty heater?

@SubZeroSpecialists

2 жыл бұрын

Check the heater using a continuity meter

@fixitfelix718

Жыл бұрын

Continuity in this heatwr should be about 30 ohms. I had a heater had continuity somehow but was 11 and 7 ohm and dancing around but should read 30 ish ohm..

Electrolux blood storage cabinet,temperature is varying abnormal