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.
SOURCE: true 49f goes into defrost
in many cases, these units have relays or contactors where the contact points actually weld together. this causes the unit to stay running even though power to the coil has been stopped. I'd start looking there first. don't over look the possibility that someone could have mistakenly miswired the unit.
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
SOURCE: We have a True TS-49F freezer that the interior
This is a freezer and the fans work off a temp sensor located inside the evaporator. This sensor tells the fans to spin once the coil gets to a certain temp around 10 degrees most will send power to the fans. So my question is... does the coil inside the freezer actually get cold enough to send power to fans. Is it a refrigeration issue not electrical. Another thing is take a straw or wood coffee stirrer and with door switch closed attempt to spin fan with stirrer. If it doesn't spin freely and has some resistance the motor is bad) Keep me posted. (You should be able to reach your hand behind coil to feel it.).
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