Question about True Display Refrigeration GDM-35F

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True gdm35 evaporator fans not working?

Compressor running but not cooling. Evaporator fans not spinning??

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1 Answer

Ruben Diaz

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  • 514 Answers

Change the fan motor, if the fan dont wonrk wont spread cool air

Posted on Sep 20, 2014

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5 Related Answers

Dennis Boxerman

  • 1305 Answers

SOURCE: We have a true T49F freezer and the evaporator

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.

Posted on Jul 12, 2009

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SOURCE: evaporator fans do not come on, why would

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. ;)

Posted on Oct 11, 2009

SOURCE: I have a True Freezer Model T-49. It works fine but every 3 or 4

This sounds like a stuck relay to me. I have seen this problem before. The defrost clock kills power to the compressor relay coil during defrost. If the contacts in the relay are welded together the compressor runs while unit is trying to defrost. On newer units this relay is mounted in base of unit on the side or back of the electrical box near center bottom of unit. The compressor relay is a small rectangular box with 4 wires attached. It can be replaced with a single pole 20 amp contactor with a 120 volt coil/ or 240 volt. Check the units name plate voltage rating and ratings on old relay! ;)

Posted on Oct 11, 2009

Joe A H.

  • 185 Answers

SOURCE: compressor runs bypassed thermostat with wire that

If you have just turned it on it takes awhile for the fans to come on. The evaporator coil has to get cold about (10 to 20 degrees) and make a klixion fan switch to turn the fans ON.... Is the evaporator coils getting a frost pattern on them??? If not then the system may be low of Freon.. If the coil is completely froze up and you are getting frost back to the compressor..... then you have a bad fan switch or a door switch.... If you have a wiring diagram you can trace out the wiring.... It is usually down by the compressor or control panel... hope this helps.

Posted on Mar 30, 2011

mike cooper

  • 884 Answers

SOURCE: 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

Posted on May 04, 2012

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1 Answer

True 49f fans stopped running. Compressor still runs. Fixes? Troubleshooting steps?


I am assuming you are relating to the evaporator fan(s) not running. If this is the case, some units have a 'Klixon" type thermostat in the evaporator so when the evaporator coil temp reaches a predetermined temperature, the fans come on. You may have a bad "Fan Delay" (Klixon) or the coil is not reaching the proper temp to activate it to turn on the fans. I would check the wiring diagram on the unit for this part to see if this unit has it in the system.

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The unit needs two fans running and good airflow, one fan outside cools the condensor coil and the other inside the unit blowing across the evaporator coil, warming it. The compressor must start up. The defrost timer stops everything and switches on a heating element to defrost the evaporator for several minutes. Please verify these conditions. The condensor coil may get clogged with dirt and lint, the evaporator may get clogged with ice build up, or the fan may quit working due to bad bearings, need for lubrication, or burn out. The defrost timer has an internal motor and contacts which may quit working, some have a way to manualy turn it to switch its mode in case it quits working.

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The unit needs two fans running and good airflow, one fan outside cools the condensor coil and the other inside the unit blowing across the evaporator. The compressor must start up. The defrost timer stops everything and switches on a heating element to defrost the evaporator for several minutes. Please verify these conditions.

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Make sure the compressor is running it should be vibrating and get warm after a few minutes. If it is indeed running the smaller tube to the compressor should be getting warm if not it could very well be the compressor has stopped pumping. If the fans are not running they could be controlled from the control board and will come on when the sensors on the evaporator get to a certain temperature. I does sound like the compressor is the problem.

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Give the evaporator a chance to get cold, then check you've got power to the fan, via the evaporator thermistor and door switch

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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

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1 Answer

Compressor runs bypassed thermostat with wire that turns on and off compressor,but freezer cabinet is not cold 65 degrees evaporator fan does not turn on,condensor fan on,sttill no cold


If you have just turned it on it takes awhile for the fans to come on. The evaporator coil has to get cold about (10 to 20 degrees) and make a klixion fan switch to turn the fans ON.... Is the evaporator coils getting a frost pattern on them??? If not then the system may be low of Freon.. If the coil is completely froze up and you are getting frost back to the compressor..... then you have a bad fan switch or a door switch.... If you have a wiring diagram you can trace out the wiring.... It is usually down by the compressor or control panel... hope this helps.

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1 Answer

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ok well... those pipes coming from your compressor one of them should be hot. if not your compressor is not running.

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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.

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fan burnt or relay fauly or fuse blown

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