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Commercial fan on evaporator cuts off after starting

Evaporator fan cuts off after start up

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There is an overheat klixon on the evaporator that stops the fan running until the coil gets below -11c This can take some time after startup. if the freezer runs more than an hour before the fan starting, check the klixon isn't faulty, and you have power to the fan. Also check the condenser grille is nice and clean as it will slow down the freezing process.

Posted on Apr 26, 2014

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What is a clixon


Clixon is an overload device designed to shut off current when too much juice is flowing within circuit. When it cools it resets itself but if condition is still present it will go out again.

Apr 17, 2014 | True 72 cu. ft. / 2039 liter Commercial...

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My true freezer won't defrost?


Check the defrost timer (in the base, circular knob you can turn till it clicks) If it doesn't heat up rapidly in the evaporator, there is a safety overheat device (thermistor) that may be cutting power to the heater, or there may be a fault with the heater itself. Are you sure the fans are working, and the condenser grill is nice and clean?

May 14, 2012 | True 72 cu. ft. / 2039 liter Commercial...

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I have TRUE freezer model number GDM-49F. the compressor start but the evaporator fan wont start what culd be the problem


Could be a number of things. It has a thermistor that sits on the evaporator to keep the fan off until it gets cold. It also has a switch above the door that switches the fan on when the door's closed. It could be a loose connection in the wiring, or, lastly, it could be a seized fan

May 04, 2012 | True 49 cu. ft. / 1388 liter Commercial...

2 Answers

My freezer has power, but the fans are not going on when the door shuts and the temperature is rising.


The defrost termination/ fan delay control is a temperature-activated, single pole-double throw switch. ).
The control is wired into the refrigeration circuit. The control is located high on the evaporator where the frost is likely to clear last. The function of this temperature-activated switch is to terminate defrost when the evaporator coil has been defrosted, and to delay the evaporator fans from coming on immediately after defrost.
The coil must reach a temperature of 25* F. for the fan delay to close allowing the fans to operate.bobicehouse_38.jpg

Jul 22, 2011 | True 49 cu. ft. / 1388 liter Commercial...

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

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


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

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2 Answers

Fans inside freezer will not turn - no cooling - compressor fan underneath is turning


The fans are controlled with a clixon that has a cut in at 5 degrees, and cut out at 20 degrees. If the unit is running and the fans are not comng on then I would have to say you are out of freon. But your condensor fan could be running and the compressor NOT be running which could be a problem with your compressor. Find out if your compressor is running by taking an amp draw. If compressor IS running then you are low on freon. If the compressor is running and your evaporator coil is cold and your fans AREN'T coming on then your clixon is bad.

Sep 26, 2009 | True 72 cu. ft. / 2039 liter Commercial...

2 Answers

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fan burnt or relay fauly or fuse blown

Mar 10, 2009 | True 23 cu. ft. / 651 liter Commercial...

1 Answer

Voltage to evaporator fan


Lots of things to look at. Let's get started.

Evap fans usually have some sort of fan delay, usually mechanical. These go bad fairly often. This could add resistance to the circuit.
You can have up to 1 Ohm of resistance through most mechanical t'stat devices. Anything over that, replace it. If you are getting 35 volts out of the board, it's probably the board. If you got voltage going in and not coming out, it's usually the board.

Mar 17, 2008 | Delfield 26.64 cu. ft. Commercial Freezer...

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