Question about Microwave Ovens
First, turn off power to the rangehood. Check the contact resistance of the light switch(es) with an ohmmeter. It should be less than 0.1 Ohms. If you get a substantially higher resistance in the on position, the switch contact is burned out. Also, inspect the wiring harness connector and the connections to the light fixtures. If they show signs of overheating, the connection resistance is too high. You can try polishing the connector contacts to remove oxidation. I use a pencil eraser for mild cases and a non-metallic dry scouring pad (3M Scotch-Brite) for more severely tarnished contacts. In the worst case it will be necessary to replace the terminals or connector.
According to the drawing for this series on the Qasair website, the unit uses fluorescent lamps rather than the halogen lamps referred to in the lamp installation instructions. If this is true, it is likely the ballast has failed (if the lamps have separate switches, they probably have separate ballasts also). If the original ballast model is no longer available, make sure the replacement has at least as high a maximum temperature rating as the original. This is especially critical for electronic ballasts. You can extend the life of the new ballasts by making sure the fans are running before turning on the lights - this should reduce the ambient operating temperature inside the hood.
Posted on May 25, 2011
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Posted on Jan 02, 2017
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