Not all intertherm furnace system have a fuse. If there is a fuse (low voltage) it is located on the control board under the metal cover where all the wiring goes, it will be an automotive style bladed fuse. On some older units it may be inline fused with the control wiring. High voltage power is generally breaker protected at the main panel. If as in some installations, there may have been a disconnect box [(fuses behind cover or in fuse disconnect handle) or plug outlet with fuse(spin in type) under flip open small metal cover,] installed by the original installer.
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