Danfoss number 8 Fridge Freezer Thermostats

Submitted: Tuesday, Apr 07, 2015 at 15:29
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I have just bought a used trailblazer 60L fridge freezer at a good price. The seller tells me he recently had a new thermostat fitted to the unit, and the condition would suggest this is correct. I have run it 3 times. On the first occasion the themostat appeared to function normally. Yesterday when I turned the fridge on, it cooled to minus 14 which was good, but when I turned the thermostat back to setting 1(the lowest), the fridge continued to run. I disconnected the thermostat and tested it with a multimeter and it does not appear to turn off regardless of the setting. I did notice that if I turn the thermostat all the way to the lowest point and then a little more, it clicks as though turning off. I haven't been able to find any operation instructions for this thermostat (Danfoss no 8: 077B7008) Has anyone had any experience with the operation of these thermostats. Have I accidentally changed the operating parameters by clicking the thermostat to this low point, or could this fairly new thermostat be faulty. I have checked the sensor and it appears to be located in the correct position in the cabinet.

Thanks Kevin
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Reply By: mike39 - Tuesday, Apr 07, 2015 at 15:50

Tuesday, Apr 07, 2015 at 15:50
The only problem I have had with our 60l. Trailbalza over the last near 20 yrs. has been the thermostat.
The thermostat does not carry compressor running current but a micro current which triggers the electronics black box.
In my case it was dust on the contacts insulating them that stopped it from restarting.
When you turn the control knob fully anti clockwise that is the "switched off" position, the click is the contacts opening fully.
I suspect one of the following:
The 75mm end of the tube clamped to the cabinet wall is not making proper contact (there is a thermal grease which helps here)
The capillary tube is cracked somewhere.
The thermostat is faulty.
You could remove the thermostat and bury the tube tip in -18* ice cubes. At mid point or less on the scale the thermostat should click off, remove from the ice and shortly click on again.
If you call Norcoast refrigeration in Caloundra the lady who answers the call is very knowledgeable and I think will sort your problem.
Hope this helps somewhat, they are known as a very reliable unit..
AnswerID: 552095

Reply By: HKB Electronics - Tuesday, Apr 07, 2015 at 16:29

Tuesday, Apr 07, 2015 at 16:29
The thermostat indeed not turn off of your testing it at room temperature, if it did
the range of operation may be to large and make adjustment fiddly.

Try setting up the fridge again and let it cool down then see if the thermostat
will switch on and off, if not then if a gas charged type it may have a fracture
line as suggested above or might not be the correct thermostat for the fridge.

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AnswerID: 552098

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