Question about Hoshizaki Freezer Commercial Ice Machines - KM900MRH Commercial Ice Machine

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Short defrost cycle so some ice still on the evap and start new cycle so after some time lots of ice on coil

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The defrost cycle is a set time. I would suggest cleaning the evaporator so it has less chance to hang up in the trays.

Posted on Feb 09, 2010

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1 Answer

Evaporator coils icing up


Extend the defrost time so the water escapes before refreezing or add an extra heater to the drain

Apr 12, 2012 | Carrier 74 cu. ft. Freezer Beverage Air E...

2 Answers

Refrigerator get icy every 4 to 6 week


Since your symtom is general, I'll answer as such.

An air leak due to doors not sealing can cause general icing. A defrost cycle that is too long can cause icing in areas other than the evap. A defrost cycle that is too short can cause evap icing. Intermittent problem with the evap fan. Overloading the unit with too much product can restrict air flow and cause icing. Door not closing due to spring loaded door closing hinge not working correctly.
I'd start with some of these suggestions to see if we can get you in a direction.
Your freezer should be able to handle a minus 5 to 10 degrees, generally speaking.

Oct 05, 2010 | True Freezer TG2F-2S

1 Answer

What controls the defrost of the evap coils, I have a S/N T27208-1 M/N 2020FRM On ocasion the two evap coils ice up, My charge is correct, My Evap fans all run. I see a two wire brown leads that go to a...


That should be The defrost termination. What controls the defrost is a defrost clock. It shows the time of day and the center will turn to start or terminate the defrost. Clock should be in a rectangular box.

Jun 10, 2010 | Randell 2020FE Freezer

2 Answers

I have ice build up in the coils and the freezer is not freezing , thawed the coils with a dryer but in a couple of days it is back again


Can't locate specific manual for your product but sounds like a defrost problem.
Unit should defrost on a regular basis. Usually controlled by a timer. It should turn refrigeration system off, including fans, and turn on heaters to clear any frost or ice on the evap coils. Cycle varies on usage. Look for timer and see if it is running. Make a mark on it and give it an hour and check again to see if it has moved.
Hope this gets you started.

Mar 03, 2010 | Arctic Air 22 cu. ft. Commercial Freezer...

1 Answer

My walk-in's ceiling panel is dripping


The coil in the conditioned space is called the evaporator.
If the water droplets are forming on the ceiling around the evap, it is due, most likely, to the defrost cycle being too long.
Defrost cycle: compressor stops, evap fans stop, electric heaters in the evap come on to clear any ice/ frost on evap fins/ coil.
The ice/ frost melts and some of it turns into vapor. As it hits the cold ceiling surface, it condensates into water droplets. Defrost cycle could be too long. Usually 4 time aday and no longer than 30 minutes should be enough unless there is high humidity.
There could be another cause.
Normally, after a defrost cycle terminates, the evap fans do not come on, due to a delay control. This prevents circulating warm are due to the heaters. The compressor comes on and cools the evap down to, usually 20 degrees or so, and then the fans come on. What could be happening is, the fans are coming on too early and blowing the water driplet off the evap and onto the back wall of the unit.
A third item, is to be sure that the condensate drain is "P" trapped. The prevents warm, outside air from being drawn in and causing exess frost build up, thus excess water and vapor.

Good luck and hope this helps

Jul 24, 2009 | Nor-Lake Freezer Norlake Refrigeration 8'...

1 Answer

I have a 7 year old Kenmore Upright Refrigerator/Freezer on top. I am losing the temp in the fridge part only. The back up the freezer gets a thick layer of ice buildup and when i remove the back panel the...


After you taken the back panel off and see a lot of ice forming on the coil before you use your hairdryer you should locate the timer and turn the center of the timer manually into defrost cycle. If you can see or hear the ice melting then your problem is the timer defective. Change the timer and that is all. But if it doesn't do anything then you will need a little bit more on electrical knowledge to deal with the rest on defrost temperature control and the element itself. Hope this help, God Bless.

Jul 13, 2009 | Kenmore Freezer 20.3 cu. ft. Frost Free...

1 Answer

We have a true T49F freezer and the evaporator fans are not running. The compressor is running on startup. The coils are cold. But are freezing up. Shouldn't the fan be on, or does the cabinet have to...


Freezers have a sensor that is referred to as a "Fan Delay/Defrost Terminator". It senses the temp during the defrost cycle. Usually, when the evap temp reaches about 50 degrees, there should not be any frost or ice on it. This device terminates the defrost cycle. It also keeps the fans off so warm air is not circulated. When the evap gets to about 20 degress or so, the sensor switches on the evap fans. If the fans are not coming on, either the sensor is bad or the evap is not reaching the proper temp to cause the sensor to turn on the fans.

Hope is helps to clear up some things and point you in a direction as to what might be going on.

Jul 12, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

Frezzing up


Be sure you have the defrost timer set for 4 defrost cycles and no less than 30 minutes each time.
Make sure doors close and seal tight.
Verify that the defrost heaters work.
Sit and time a defrost cycle. It could be terminating early, prior to the coil being completely cleared.
If it is frost on the coil, could be an air leak or high humidity.
If it is icing, it is a defrost problem.
Start here and let me know.

Good Luck!

Jul 07, 2009 | Beverage-Air 44.9 cu. ft. / 1271 liter...

2 Answers

Freezer Not Fan not running!


Most all commercial freezers have some sort of fan delay/ defrost termination device. Commonly called a "Klixon" (pronounced clicks-on). It is a device that is attached to the evap. It's function is to terminate the defrost cycle when the evap reaches a certain temp, say about 50 degrees or so, to ensure there is no build up of frost/ ice on the evap. It then allows the compressor to run, and cool the evap down to a reasonable temp., say about 20 degrees, and then let the evap fan come on. It prevents overloading the compressor during a high temp condition, and it also prevents circulating warm air left from the defrost cycle. I believe this device is most likely your problem. With no air circulating, the box will no cool down.. I have seen them burn and/or slhort internally. They can come apart. too. I would look here for that problem. the True manufacturing website does not give alot of info on this piece of equipment, such as a wiring diagram but manuals are available.
Check this out and let me know how it comes out.

May 17, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

I have an older commercial upright Hobart freezer. The freezer seems to operate fine, cycling but always returning the compartment to zero degrees, until all of a sudden the temperature went up, well...


In most cases, an evap that freezes up is either an air flow problem or no defrost cycle. Older Hobarts have mechanical defrost time clocks. It could be locked up i.e., not running so no defrost cycle.
It could be coming out of defrost too early because the sensor that monitors the evap temp is not working properly.
The door could not be closing. If left cracked open, it will freeze up every time as unit never hits temp., keeps unit running. Warm air is seeping in and the moisture freezes on evap.
Lastly, the defrost heater(s) may not be working. Burned out, shorted, broken wire, etc.

Good luck and hope this helps.

Mar 28, 2009 | Victory Commercial Freezer VSF-3

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