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Secondary fuse i replace my thermostat and think i have blown a fuse. help? I found the one fuse but can not find the secondary one. i have a trane twn030b140a1

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Usually there's a fuse in the electronic board in the air handler (it's like the car fuses and 3amp or 5 amp). Also some transformers have a reset switch.

Posted on Sep 28, 2009

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Trane Air Handler and Trane Thermostat with no power. Please help


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Blown Transformer heat pump


blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
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Hi I am replacing a trane thermostat it has 8


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Where is the fuse box in the inside air handler?


There should be a small 3 or 5 amp fuse on the circuit board inside the air handler.

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What caused the power outage? Check the outdoor disconnect to the condenser unit. The fuses may have blown, causing the heat pump to not function and depending on the aux. heat to carry the load.

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