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Most likely causes are a shorted high voltage rectifier or burned-up high voltage transformer. Visual inspection should indicate which one. Be wary of the high voltage capacitor - some keep a charge of 4000 volts, or more, even when unit is unplugged.
Yes, it radiates heat. It can also radiate a little light under certain conditions. If you're worried about health effects, the two main concerns would be getting burned if you touch the heating element and accidentally starting a fire. The radiation danger is no worse than a lightbulb or a television.
Check for blockage in the flue pipe or improper flue design resulting in inadequate venting. One way to quickly determine a venting issue is to visually observe the flame on the burn tray. It should NOT be yellow and should burn evenly across the burner. There should NOT be any areas of the burner that appear to burned or deteriorated. Look for evidence of leaks,
You may need to dismantle the top section of the heater to visually inspect for sooting. You may need to inspect the flame sensor mechanism (if applicable) for dirt or sooting.
If it is determined that your exchanger is sooted up, you have a blockage in the flue pipe or improperly designed flue.
check that the battery cables are properly installed,
check the battery voltage,
visually inspect positive battery cable for a blown fusible link(section of wire designed to burn like a fuse).
Bring it to a camera shop or an authorized Sony service center. DIY on this is a bit dangerous as the bulb could break into small pieces, beside you don't want finger prints in any optical part. Once you fire it up with contaminated optics it will burn in or explode, body oil acts like cooking oil poured on a hot frying pan.
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