The first time that happened to me it was an easy fix. I read the adler barbour manual and it was only the thermostat setting inside(not the knob that you see). The fridg and the air cond manufac. have been very helpful with free advice. Even if not Adler Barbour or Mermaid; just e-mail and ask them. Contact any manufacturer, I think they will help, cause they know it may lead to a sale.