When a valve is unable to open and close properly, it can sometimes heat up, causing an electrical short that blows a fuse. Something could be wrong with your draft inducer motor. I have a Philco Nordyne KG6RC 80C-12B furnace on the second floor (about 7 years old). The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. The furnace fires up just fine but after a few minutes the 3A controller board fuse pops. If you haven’t been diligent about maintaining your furnace, all its parts will have been silently and … This afternoon, our Ruud furnace suddenly stopped working. I did some researching and found out it was the 3A fuse. If you have a gas furnace, one of the valves may be failing. Your furnace’s control board has a separate fuse that protects it from getting too hot. After poking around a bit, I realized that the 3A fuse on the control board had blown. For the last couple years it has blown the 3a fuse on the board several times when we first turn the heat on before deciding to work normally for the remainder of … The furnace started up, ran for about 20 minutes and blew the fuse again. Noticed the 3A Fuse was blown...replaced it and taped down the switch thats on the front of the unit. Replace, blows again. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. Upon starting the system in the heating mode it ran for about 30 minutes and then blew the 3A control fuse. (Goodman ARUF48D14AC air handler and VSZ140421AA heat pump) On the chance it was just a bad fuse, I replaced it and it blew again after approximately 3 mins of air handler and condenser operation. Upon looking into the thermostat issue, I found that the 3A fuse on my furnace board was blown. Electric furnace thermostat control wire. 3 Amp Control Board Fuse Keeps Blowing So, a few months ago my AC wouldn't kick on nor the fan or furnace. You might need a new ignitor or flame sensor, or it could be something more serious. When the furnace went out, I checked the circuit board and noticed I was getting code #24; "secondary voltage fuse is open - check for - short circuit in secoundary voltage wiring (24 VAC) wiring". But for those who’ve recently encountered one common issue – a furnace blowing its fuse – before scheduling that tune-up, it may be due to one or more of the following reasons: 1. As the title states, I have a blown 3 amp fuse on the control board located in the air handler. I have a Bryant M/N 383KAV036070AGJA, S/N 3097A08913, Series G furnace with central air that is blowing the 3-amp fuse on the control board. I've removed low voltage wires coming from thermostat and ac unit and I've removed the 9 pin connector for the 24 volt circuit within the furnace. Within a 1.5 secs after I push door switch in the 3 amp fuse blows. last guy replaced board already. The control board was even replaced by one outfit about two years ago at considerable expense, and ran fine for about a year. I'm stumped. This is a split unit with a remote heat pump outside. With some trial and error, I found that the circuit is -fine- in the heat, or fan-only settings. It's only when the thermostat tries to activate the AC that an issue occurs. Before you check into a hotel, check out our troubleshooting guide below. It can get mighty cold mighty fast if your Nordyne gas or electric furnace isn't working. So I'm working on a sure comfort Nat gas furnace. After a few seconds, there is some clicking and then the red light 1-flashes -some times it goes back to solid for a few … Since this had happened once, about a year ago, I installed a new fuse from the box I had on hand. Dirt. 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