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romr2009, Repair Technician
Category: Appliance
Satisfied Customers: 1782
Experience:  32 years practical systems experience: computer/phone, automotive, appliance, & electrical control
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mini cooler not cooling

Resolved Question:

mini cooler not cooling
Submitted: 5 years ago.
Category: Appliance
Expert:  romr2009 replied 5 years ago.
  • Are you running on 12vdc or 240 vac?
  • If you were using 240 vac, the short circuit may have damaged the diodes/rectifier that converts the ac to dc for the thermoelectric element to work.
  • Also check the heat/cool switch for corrosion.


Customer: replied 5 years ago.
hi this is running on 240v. the switch is on cool and the inside and outside switch are working. is seem cold at the bach outside but does not cool inside. sits at 20oc
Expert:  romr2009 replied 5 years ago.
  • You will need a multimeter to check this out.


  • The thermoelectric element requires 12 volts DC and about 4 amperes of current.
  • Check the voltage going to the thermoelectric element.
  • If it is more than 15 volts there is a problem with the voltage regulator that converts the 240 volts down to 12 volts.
  • If the voltage is ac and not dc there is a problem with the rectifier/diode bridge.



  • Note that the thermoelectric element instantly gets hot on one side and cold on the other side.
  • The hot/cold switch reverses the direction of the current and changes the hot and cold sides.


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