Norcold Repair Guide Models 442, 443, 452, 453, 462, 463, 482 ...

B10116. If you read an open, the refrigeratorwill not cool and theheater element must be replaced.17. If you have a reading, but it isless or greater than the specification,it indicates the elementis not the correct size andmust be replaced.18. A shorted heater element willcause the 5 Amp fuse to blow.The Refrigerator will notOperate or Cool on DCElectricNote:DC operation will not initially cooldown the refrigerator. The initialcooling must be done in either theGAS or AC modes. Attempting tocool down the refrigerator in theDC mode will result in poor coolingor battery run down.1. Check for 12VDC betweenpositive and negative leads atthe rear of the refrigerator asshown in Figure 3.41.2. The voltage must be from10.5 to 15.4 volts with the refrigeratoron.3. Check the continuity of F3fuse. Figure 3.42 indicates ablown fuse (meter pointer remainedat left side of scale. Ifthe fuse was good, the meterpointer would have been to theright side of the scale).4. Replace the fuse if necessary.15 Amp Fuse required on singledoor models and 20 Ampson double door models.WARNINGNEVER OVERFUSE A CIRCUIT. RE-PLACE BLOWN FUSE WITH EXACTREPLACEMENT INDICATED BYNORCOLD. OVERFUSING A CIR-CUIT CAN RESULT IN A FIRE.Note: Before gaining access tothe combination control, check theDC Heater element as described inSteps 16-19 on page 3-20.Figure 3.41Figure 3.42Figure 3.4312 Volt Check at DC Supply ConnectionsChecking F3 Fuse for ContinuityAccess to Controls3-18