Question about Coldtech 21 cu. ft. / 595 liter Commercial Freezer J2SFF-21B

2 Answers

Commercial freezer stops cooling and goes into delay start mode.

The freezer does eventually cool, but not consistently or quickly. Our Jimex/Coldtech J2SFF-21B freezer starts, when we plug it in, with the cooling light on the temperature controller (model SF-104) blinking, which the manual says means it is in 'delay start mode.' It doesn't cool during this time, though the inside fans run. After a few minutes, it switches into cooling mode, and I can hear the unit turn on. But 5-30 seconds later, the display blinks and beeps and switches back into delay start mode. Over hours, sometimes the unit will inch down in degrees, but at other times it seems not to cool at all. I've left it on overnight and found it freezing in the morning, but haven't been able to catch it actually getting there. Unfortunately, for what we're doing, we need the unit to cool somewhat quickly and predictably. Extra unfortunately, the company that made it recently went out of business and even though I have manuals and they provided a partial list of recommended replacement parts, I can't actually talk to them, At first, I thought this was a programming issue, and tried checking all the parameters and changing some of them, like 'compressor start delay,' 'hysteresis/differential,' and 'offset for the evaporator temp reading,' and also played around with minimizing the defrost to make sure that wasn't an issue (it's not indicating that it's turning on). But the pattern stays basically the same. Now I wonder if there's something kind of shorting out whenever the unit cools for a few seconds, and then the whole program starts at the beginning as though it's just been unplugged and plugged in. I'm not familiar with that part of how the freezer works, and I'm not sure how it would go from that to eventually freezing. In addition to the temperature controller, there's a button panel with things like 'refrigerator on/off,' but it seems to be not intended for the owner to mess with (it's covered by the panel), isn't even mentioned in the manual, and in any case does nothing I can notice if I do push the buttons. Has anyone seen anything like this and have a suggestion for us, or even the name of the part(s) of a freezer that might be involved in something like this so I could do some more research? Thanks so much for your time in helping out and all the best! Melissa

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have the same problem. Gets to 9degrees and kicks out. Its a 3 door (2 compartments). replaces the controller on one side and now the other side is doing exact same thing. Now I don't think its the controller as they both kick out at 9. ideas??

Posted on Nov 15, 2014

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 39 Answers

Unfortunatly the company has gon out of buisnees and parts available
are kind of hit and miss. As a profesional technician it really frustrating.
I would definitly look at the control side of it. some it could be the relay or digital controller. Good luck hunting the parts down. There are some online parts dealers that still carry some parts. Have your model number
and serial number readily available when ordering.

Posted on Apr 18, 2013


3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1524 Answers

SOURCE: Need to know Start Capacitor mfd and voltage

Why not get a Supco 3 n 1

Posted on Jul 21, 2010

  • 88 Answers

SOURCE: freezer stays around 23 degrees, freezer guy says

23 degrees definitely no good. Your getting some refrigeration though so compressor probably OK. Could not be seized. This may not be a hermetic system .you may have lost some refrigerant.But sounds more like your not defrosting .Have freezer guy check for manual defrost switch or defrost timer .
Re post with more information for more help


Posted on Aug 18, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

When the cooling cycle is finished, the refrigerator will not stop running.

because cooling cycle and compressor is not same thing ,cooling cycle fixed beside the compresor you can see that.

Mar 13, 2013 | True 72 cu. ft. / 2039 liter Commercial...

1 Answer

Hi i have km-320-mwh hoshizaki ice machine, this machine is discharging water in drain continuesly except when it is dumping ice is this normal ...too much water is being lost please help many thanks...

By looking at the model number it is a water cooled unit. It will dump water down the drain continuosly as that it how it cools the compressor. If it was a MAH it would be air cooled and no continuos dump of water.

Aug 09, 2011 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

We have a True TS-49F freezer that the interior fan have stopped working. Holding the door switch does not activate them. Unit is out of warranty.

Most all commercial freezers like yours have, what is called, a fan delay. It is located in the evaporator case and is usually attached on or very close to the actual cooling coil. It may also be a combination switch known as a defrost terminator/ fan delay. It's purpose is to keep from circulating warm air. If the cooling coil does not reach a preset temp, the fans do not come one. Another thing is that the fan motor may just be bad. If you have more than one fan, then chances are that it's going to be the fan delay. I would start there to see that either the fan delay switch is bad or there is a reason that the coil is not getting cold enough to activate the switch.

Nov 09, 2010 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

I have a hosizaki ice machine. the warning buzzer is continious. is it the control board?

check to see if you have the correct water pressure going into the machine. You need at least 30 psi. Also if your machine is water cooled, be sure cooling water is entering the machine. on water cooled machines there will be a continuous flow of water into the drain whenever the machine is running. If it is air cooled check the condenser coil to see that air is flowing freely through the coils.

Sep 11, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

My service man replaced the defrost cycle timer and the relay (timer was definitely broken, relay was highly suspect) but the freezer fan still has no power so freezer will not chill adequately despite...

Most all commercial freezers have a fan delay/ defrost terminator. It is usually mounted on the end of the evap coil. It's purpose is to sense the temp of the coil during the defrost cycle. When it hits a preset temp., usually around 55 degrees or more (depends on Mfg.) It terminates the defrost cycle. It also doubles as a fan delay. It allows the evap coil to cool off from the defrost cycle before allowing the fan to come on. Usually, the coil has to get around 20 degrees before fan will energize. I would look for this as a possible problem. It could be one device with 3 wires or 2 separate devices with 2 wires each. I've seen it both ways.
Hope this helps.

Nov 19, 2009 | Traulsen 46 cu. ft. Commercial Freezer...

1 Answer

Evaporator fans do not come on, why would evaporator is not cool enough?

There are three main reasons the fans would not come on.
1: A bad door switch. There are switches on the top part of door frame. They turn fans off when door is opened to prevent warm air from being drawn into unit when door is open. If a switch goes bad the fans will never turn on.
2: Refrigeration problem. The fans are tied into a temperature switch called a fan delay. The fans will not come on until the coil is well below freezing. This is to prevent water spray after a defrost. If unit is low on gas or has any other cooling issue the fans will not come on.
3: Bad fan delay switch. If the fan delay switch becomes "stuck open" the fans will not be energized.

Feel the back of your evaporator coil, if it is very cold and frosted you probably have a bad fan switch, or a bad door switch. ;)

Oct 10, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

KM-500MAH water keeps cycling thru when in ice making mode.

if this is a water cooled machine, the head pressure flow controller need to be replace/adjusted.

Jul 12, 2009 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Unit not freezing , evaporator fan wont run

If this is a Bev-Air, don't think the door switch will control the fan. At the evap, there is a temp sensor called a fan delay. When unit goes into defrost mode, this warms up. Some also serve a dual purpose. It will terminate the defrost cycle at a certain temp., say 51 degrees or so, at the evap. Anyway, when unit comes out of defrost, it keeps the fan off so it allows the evap to cool quicker and to prevent circulating warm air. This could be your problem. Not a hard fix but they can be a pain sometimes. Outside chance that the unit is low on refrigerant (freon). This will not let the evap get cold enough to trip the sensor back into position to turn the fan on. Good Luck. Restaurant Parts and More carry alot of Bev-Air stuff. 1-888-814-1110. Ask for Rick

Oct 09, 2008 | Beverage-Air 23.1 cu. ft. / 654 liter...

1 Answer

Compressor stop after about 2 minutes operation

If your unit is air cooled clean the condenser. If your unit is water cooled check for proper water supply pressure.

Jul 28, 2008 | Hoshizaki Freezer Commercial Ice Machines...

Not finding what you are looking for?
Coldtech 21 cu. ft. / 595 liter Commercial Freezer J2SFF-21B Logo

329 people viewed this question

Ask a Question

Usually answered in minutes!

Top Coldtech Freezers Experts

Dennis Boxerman

Level 3 Expert

1165 Answers


Level 3 Expert

76846 Answers

christian nielsen

Level 3 Expert

358 Answers

Are you a Coldtech Freezer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides