Vento fridge fan kit (1 Viewer)

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I've now fitted two of these kits which don't work as I expected.
The first kit started running when the ambient temperature was only 20°C and cycled on / off every 5 seconds, adjustment of the trim screw made it run constantly !

I fitted a complete replacement kit today.

With the fridge switched OFF the fan switch in auto mode and an ambient temperature of 22°C the fans were still but as the temperature around the fan thermistor sensor hit 26°C the fans started then as the fans cooled the thermistor the fans stopped, but within seconds the fan motors began to emit a high pitched squeal before starting to spin again and continued to cycle in this way on off squeal on off
Adjustment of the trim screw only varied the fault by 1°C
The high pitch noise definitely does not come from the control box

Have I received two faulty fan kits or is there another reason, any suggestions welcome.
Thanks in advance !

 

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Apologies for posting in the wrong section, post now moved to "Fridges and Ovens"

 

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Where are you measuring the temperature?

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The thermistor is fitted between the fans and facing the heat exchanger, I measured the temperature of the thermistor using a digital thermometer that has its own sensor on the end of a lead

http://www.ebay.co.uk/itm/DIGITAL-A...600314?hash=item3f5d9e613a:g:sLkAAOSwUV9WprwO

 

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I sent an email to Bruner in Italy enquiring if this was a known fault but the reply was to "return to seller"

The Fans are designed to switch on at 50°C not 26°C !
The seller has offered to send another set, so hopefully third time lucky