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Mitsubishi MSZ-GA25VA Furnace Door Switch
A furnace door switch is a safety feature that inhibits the vent fan and ignitor being triggered to start in order to prevent injury and fire. Do not try to fix it, just have it replaced as quick as you can if it is damaged so as to prevent something bad happening.
Major symptoms to watch for in a bad switch on the furnace door
- The furnace door switch is removed
- The whole system will not begin whether the door is open or closed
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