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When the defrost comes on it is on to long the temp gets above freezing I need to make the defrost cycle shorter

Does it? Or is it just the display that reads 50? Don't forget the evaporator has to get to 50f to get rid of the ice forming on it. It will do this 3 or 4 times a day, but the product temperature should not creep much above setpoint. Check the food temperature with a digital probe when defrost occurs to see if it is only the display module ( which may have it's sensing phial too close to the evaporator or have lost it's insulation jacket)
Also check the grill in the base (condenser) is clear and clean so it recovers from defrost as it should..

May 17, 2012 | True 49 cu. ft. / 1388 liter Commercial...

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Over temperature warning light has come on

When the overtemperature light comes on it is an indication of possible failure.
But before panicing check these items first.
1.Condenser clean
2. Condenser fan operating (if so equipped)
3. Clearence around unit to allow proper air flow
4. Is compressor running ? (if not check relay, overload)

The compressor relay's purpose is to start the compressor. A faulty relay can result in the compressor failing to cycle on. The relay is accessed from the lower rear of the refrigerator.
Before testing a compressor relay, unplug the refrigerator to avoid an electrical shock hazard. Also, if the compressor uses a capacitor, it must be discharged first to avoid the risk of electrical shock.
The compressor relay can be accessed by removing the terminal cover box. The cover is held on by tension or with a retaining clip.
Remove the compressor relay by pulling it straight off from the compressor
Pull the wire off of the side terminal of the relay. It is connected with a slip on connector. Firmly pull the connector, do not pull on the wire. You may need to use a pair of needle-nose pliers.
Inspect the connector and terminal for corrosion. If either is corroded they should be cleaned or replaced.
There are two types of relays you may encounter, wire coil and solid state. If the relay has an exposed wound wire coil it can be tested for continuity. Otherwise, the relay is of solid state design and requires specialized equipment for testing.
Test the compressor relay for continuity using a multitester. Set the multitester to the ohms setting X1.
With the relay upside down, place the probes into the terminals labeled "S" and "M". The multitester should display a reading of zero ohms, indicating continuity (or if using a continuity tester, it should light up).

relaytest1b.jpg With the probes still in place, turn the relay over. You should hear the click of the magnetic switch engaging. The multitester should now display an ohm reading of infinity (or the tester should not light up).
Turn the relay upside down again, place the probe on the "S" terminal and place it on the side terminal labeled "L".

relaytest3b.jpg The multitester should now display a reading of zero ohms (continuity). Turn the relay over and the reading should change to infinity.
With the relay upside down place one probe on the "L" terminal and the other probe on terminal labeled "M".

relaytest2b.jpg The multitester should display a reading of zero ohms. Turn the relay over and the reading will stay the same, zero ohms.
If the compressor relay does not pass all of these tests, it should be replaced

Aug 07, 2011 | Swan SR5170 Freezer

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Display screen temp. not matching temp. inside freezer .

most likely the temp sensing probe. Possibly the sensor has been moved from it original position and reading the wrong temp. too.

Jul 07, 2010 | Delfield 20 cu. ft. / 566 liter Upright...

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TEMP ON FREEZER IS NOT COLD ENOUGH WHEN SET TO -23 KEEPS RETURNING TO -9. there are three buttons on the top of the fridge, one with a speaker sign, one saying SUPER and the third with the degree sign....

Sounds like you need to do a 12 hour defrost. If the evaporator is caked with ice, the thermistor(temp.probe.) will also be covered. the true temp wont be read in this state. Defrost and then retry. Take note of temp for a period of time. See if it ever goes to -20 as selected. If so then at a later date it goes off again, there is then a defrost issue. Suspect the door was left open accidentally.

Jun 04, 2010 | Freezers

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My true freezer temperature gage has a P1 flashing code

If unit keeps proper temp. then I would think that either the thermometer sensing probe may have been damaged during the repair process or the thermometer itself has failed.

May 13, 2010 | True Commercial Freezer TM74F

1 Answer

Temp inside stays constant but outside display temp goes up. Is it a sensor?

before you replace the thermometer, check the probe placement. If its near the door entrance, the lights, or any other source of heat when the door is opened, then it may not need to be replaced.

Jan 07, 2010 | Master Bilt Freezer MBP-CCR49DF

2 Answers

Compressor runs but does not freeze. The top inside walls will frost up a little but that's all. Even if I change temp setting.

The temp sensor may be bad. You can test it with an ohmmeter to see if there is resistance. You can put one probe on each side to see if there is a reading. Also many units have an auto defrost timer that can go bad. Unfortunately, it is behind the inside panels of the top of freezer.

Nov 14, 2009 | Freezers

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Freezer used as a frige?

it may be possible. Turn the temperature on the lowest setting and see what happens. If it still freezes everything up then it is not posible. If it doesn't freeze everything , then check the temperature with any temp probe. It should run at somewhere between 36 and 38 degrees. This is the normal cool setting on a refrigerator.

Nov 07, 2009 | Freezers

2 Answers

Ice maker runs continueously

I don't have the details on you machine but if I were going to trouble shoot this problem, assuming its a temperature probe I would power off the machine, remove the access panel and remove the temperature probe and check it with an Ohm meter or continuity checker for proper functioning by putting the probe in ice and see if it opens electrically. Sometimes the probe is not a simple thermostat type. The bin control on some machines is optical. The ice pile breaks a light beam to turn off ice making. Sometimes the probe is a thermistor. These latter two kinds of probes have electronics connected to them. A simple ohm check will not work for these cases. You can tell what kind you have by looking at it carefully. The thermostat kind that can be checked with a continuity checker or ohm meter is a sealed metal tube. The optical type has a light source and a separate pick up sensor. The thermistor type is a very small device on the end of a pair of wires. For the optical type or the thermistor type write back for more details.

Nov 30, 2008 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer


if assited check air circulation within cabinet.
check condenser if air assited, clear and clean if necessary.

failing that air probe might be dodgey
condenser fan ?
or thermal over load on compressor

Feb 19, 2008 | Freezers

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