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Amana 18 Model TQ18NBL Shuts down during cooling cycle.


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5 replies to this topic

#1 tjquick

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Posted 10 December 2011 - 12:50 PM

My Amana refrigerator shuts down randomly during a cooling cycle. When the unit is operating normally, the compressor, condenser fan, and evaporator fans all run for about 5 to 8 minutes. But sometimes it will start a cycle and randomly shut down for a second or two and try to start again. Both fans come on, but the compressor won’t restart again I guess because of the high head pressure and clicks a few times then starts. It runs till it's finished cooling things down and all is fine, but sometimes it repeats until it shuts off normally. Could it be a faulty thermostat of the defrost timer? It's like someone pulling the plug from the wall for a second and pluging it back in. I was thinking it’s got to be a set of contacts interrupting the normal current flow. A few times when it’s acted up, everything shuts down for a second, fans come on for a second, then stop a second and finally stay on till it’s finished cooling down. Any ideas?

Thanks
Tom

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#2 Samurai Appliance Repair Man

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Posted 10 December 2011 - 03:29 PM

My Amana refrigerator ... randomly shut down for a second or two and try to start again.

but the compressor won’t restart again I guess because of the high head pressure and clicks a few times then starts.

Could it be a faulty thermostat of the defrost timer?


You're thinking along the right track. You have potential, Grasshoppah!

As you've described, the compressor is short cycling. The thing to figure out is whether this is caused by a mechanical problem with the compressor itself (drawing excessive current and tripping the overload protector) or it's a control problem with the overload/relay, cold control, or some other control or wiring.

Measure the current draw on the compressor when it's running and compare with the nameplate rating on the compressor. Post both here.

#3 jumptrout

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Posted 10 December 2011 - 05:32 PM

Does the condenser fan motor at the compressor stop when this happens?

#4 tjquick

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Posted 11 December 2011 - 03:03 PM

I will see if I can get an amp probe to mesure the current. But when the compressor shuts down, the condenser fan does the same and so does the fan inside the refrigerator. All is quiet for about a second, then the fans starts up again and the compressor tries to start. Normally, you hear a nice 'click sound' when it shuts down at the end of a cycle. But in the middle of a cycle, no click when all shuts down.
Thanks
Tom

#5 appl.tech.29501

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Posted 11 December 2011 - 07:42 PM

sounds like the cold control is flakey.... causing the compressor to short cycle. bad compressor wont stop the fans from running, only cold control.


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#6 DurhamAppliance

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Posted 11 December 2011 - 07:59 PM

Repaired a fridge with the exact same symptoms yesterday. Jumped the cold control and everything works fine. ...this reminds me I have to order cold control in the morning!

Durham Appliance Thrift & Repair, LLC

www.DurhamApplianceThrift.com





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