Question about Delfield 37.96 cu. ft. Commercial Freezer Meridian MFR2SS Stainless Steel

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The unit begins a defrost cycle without warning

It starts defrosting without warning. The temp raises to about 40 degrees farn. then will cycle back down to below freezing and shut off the defrost cycle.

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  • Delfield Master
  • 856 Answers

In general, a freezer will go into a defrost cycle about every 6 hours and usually from 25 to 40 minutes. After the defrost, the unit should function normal. Pull down to temp and cycle off. If the product shows signs of thawing, then I would be concerned about the box temp. Defrost may be too long or some other issue may be effecting it. Otherwise, if no signs of thawing, I wouldn't be too concerned. It's the product condition that is the concern.

Posted on May 04, 2010

  • andrealeighm
    andrealeighm Mar 15, 2013

    What can I do to make an adjustment to the freezer if i am seeing signs of thawing during a defrost cycle? My freezer is brand new and still on factory settings. Can I make an adjustment so that the defrost cycle isn't as long or as warm?

  • Dennis Boxerman Oct 07, 2013

    Delfield has a good website with access to the manuals. They explain how to make adjustments to the defrost cycles.

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1 Answer

Defrost cycles


Defrost cycle usually comes on after about 7 hours. If it is happening every 30 minutes or so, the defrost timer is not working properly and your internal temperature will never have a chance to go down to zero as SOP.

When defrost cycle comes on, the compressor is automatically shut off and internal freezer temps can go up by close to 25 degrees or more. It is for this reason that commercial freezers do not have auto defrost - the latter extols a price, convenience at the price of higher average temps and less time to properly store foodstuffs in freezer.

Nov 20, 2013 | Freezers

1 Answer

Does not get cold enough


If refrigerant charge is ok, make sure that the evaporator coil is not covered with ice. The latter serves as an insulator and will keep unit from achieving designed low temps. Remove ice by defrosting unit manually and then restarting unit. If ice continues to build up at alarming rate check for the tightness of door gaskets. If lots of moisture gets into unit, it will collect and freeze on coil. Also check to see that the defrost timer is not going on excessively. Those defrost cycles can raise internal temps by as much as 25 degrees; if the cycles come on prematurely and/or very often internal temps will be high.

Nov 16, 2013 | Kelvinator Freezers

1 Answer

Freezer defrost cycle


If the defrost timer sticks in the defrost mode,yes. Normal defrost time is 30 minutes or less depending upon which timer is installed.
If it happens again,locate the defrost timer and turn the dial manually to see if the compressor comes back on. If so,replace the timer.
It is probably on the rear near the compressor. Some are under the front behind the dust guard.

Feb 24, 2010 | Frigidaire 20 cu. ft. / 566 liter Upright...

1 Answer

Sanyo Frost Free Fridge (Model SR 1031) very slow to cycle through freeze to defrost back to freeze cycle. The temp in Freezer compartment goes from -17 degrees to -1 degree then back to -17 as it takes in...


DO NOT TRY TO MODIFY TIMING CYCLE.you would need to completely modify printed circuit board and inbuilt computer......some freezers cycle around 6 to 8 hours.the temperature can only be checked say every 12 hours to get an average reading

Feb 10, 2010 | Freezers

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

My Artic air makes a grumbling sound, it sounds like the compressor may be cycleing, the outside walss of the frezzer are very wam to the touch but inside temp varies from 20-40 degrees. The door seal is...


Check to see if the condenser fan at the back underneath near the compressor is running. If no check fan.

How to check stuff>
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
OR


The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.

If this ice is not melted it will continue to build up until the air can’t flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.

If the defrost thermostat is bad it can prevent the heater from coming on OR it won’t turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.

The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it’s bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it’s in the defrost mode.

If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.

If you need help finding your model number see here> http://www.appliancepartspros.com/modelnumber_locator.aspx

To locate your timer, motherboard, control or adaptive defrost control , enter your model number and search for the part or post back on Fixya.
http://www.searspartsdirect.com/partsdirect/index.action?psid=26129238&sid=PSx20071217x00001a

Sep 20, 2009 | Arctic Air 22 cu. ft. Commercial Freezer...

1 Answer

New freezer not cooling - temp @ 25 degrees and food is defrosted


It is probably the control board and since it's new it's still under warranty so a certified Frigidaire repair man will fix it without charge. There should be a telephone number with the paperwork you received when you bought it.

Aug 29, 2009 | Frigidaire 20.3 Cu. Ft. Frost-Free Upright...

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

1 Answer

Proper temp. range in freezer


Hi dgh1,
The freezer should stay within 5 degrees of 0 while in operation. While in defrost the freezer may reach as high as 20 to 25 degrees. If any higher temperatures are reached your food will spoil as they are defrosted and refroze everyday. If you find that the temperature is allowing your food to defrost you may want to replace your defrost thermostat. This device is located on top of the evaperator coil inside the back of the freezer. It is made to turn the heater off when a temperature of 55 degrees is reached. One other possible problem could be your defrost timer is taking to long to restart the cooling cycle after defrosting. I hope this will help you and please send any other questions you may have, I am happy to help. and dont forget to rate me.
Mike Anderson
Anderson Appliance
(865)945-3808

Oct 28, 2008 | Kenmore Freezer 20.3 cu. ft. Frost Free...

2 Answers

Running but does not get cold enough


feel the sides or the coils on back if it has any see if they are hot or cold

Feb 20, 2008 | Maytag 15 cu. ft. / 425 liter Upright...

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