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the 24 vac power source from the 24 vac transformer is protected by an automotive 3 amp fuse burried in the cable harness! The 3 amp fuse (pink) has two 1/4" quick connect lugs connected to the circuitry by two wires, a grey and green on my furnace, and was folded deep into the cable cluster held by a few cable ties. I expected a chassis mounted fuse, but nope! DO NOT USE A LARGER AMPERAGE FUSE than a pink 3 amp fuse. It protects the transformer from burning out if overloaded or shorted components, and something caused that fuse to blow--if blown! If it were blown, you would see a blackened spot in the fuse body between the two lugs.
My furnace and outside AC condenser unit were dead and I decided to troubleshoot it myself. The furnace schematic was pasted inside the control box cover (2 screws). My voltmeter told me that the transformer was ok (24 VAC out/ 240 VAC in) but nothing else was getting 24 volts! Eventually, I found the fuse, replaced it and it immediately blew out! Traced the problem to mouse-chewed and shorted 24 VAC control leads out to the Condenser unit. Rewired the wire run with new low voltage wire from the furnace to the condenser unit and PRESTO! It all worked and the next 3 amp fuse held!
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