To replace the halogen lamps, the power supply to the furnace must be disconnected. Loosen the individual cross-head screws of the glass housing on the side, near the furnace opening. Slide out the center of the glass housing. Loosen the four screws at the corners of the copper plate located just below the stone floor surface. Remove this plate. The electrical cables that are now visible form the power connection for the lamps. Make it easier to remove the lamp holder by gently pushing it upwards. After replacing with the halogen lamps already mentioned above, OSRAM 12v. 20w. Code 64428 OVEN, the reverse procedure should be followed.