![]() WTF Could it be a faulty PEK device Also I have an unused yellow wire at the furnace. However, when I attempt to power the unit on I blow the 3 amp fuse on control panel. I’m about 99 sure that all my wires were correct as per instructions. I did not have a C wire so I had to use the PEK device. Then use the following as a guide to select the correct fuse:3 Amp fuse for appliances up to 700 Watts,5 Amp fuse for appliances ranging from 700 to 1000 Watts,13 Amp fuse for appliances over 1000 Watts.Remember to never use a fuse which has a higher rating than necessary, as it can be dangerous. I installed the Ecobee lite 3 from Costco. 3AMP - 32V - Low Voltage Automotive & Marine Blade Fuse - Color: Purple/Violet. If you can’t tell what the rating is, or it’s not clear, you can check the rating of the appliance.Consult the appliance rating plate (often found on the rear or underside of the appliance) or look at the manufacturer’s instructions to find the wattage. ATC blade fuses for automotive and low-voltage control circuits. Step Oneįirstly, check the fuse you’re replacing. An incorrect fuse however will continuously blow if under rated or fail to protect your equipment from possible catastrophic meltdown if it is too high. The reason for this is simply they are the most commonly available sizes and as such are cheaper to buy, whilst meeting the minimum protection required. 3 Amp, 250 Volts, 313 Series, Lead Free 3AG Type, Cartridge Fuse, Time Lag (Slo-Blow), 100A 250V AC Interrupting Rating. For example, a table lamp would have a 3A fuse where a washing machine a 13A but rarely will you find anything in between. The house was built in 2014, if that has any relevance.Generally these days, most new, domestic appliances come with a pre-fitted moulded plug that already incorporates either a 3Amp or 13Amp rated fuse. So, I have been working on that all day.reading various sites and checking different things and I have yet to find my issue. I went out and bought a couple of space heaters until I could have a day to see if I could figure this out myself. Tried this one more time with my fingers crossed, but that didn't work either. I went back into the attic and the fuse had blown. Everything looked good and sounded good, but after a few minutes I looked over at my thermostat and it was blank again. Thinking that I found a quick/cheap fix I headed out to Home Depot to buy a couple and installed one when I got home. Colour coding varies by size - so a violet mini blade fuse is 3A but a violet maxi-fuse will be 100A. ![]() I kept snooping around and noticed the 3 amp fuse was blown. Fuses normally display their amp ratings on the top so this should be clearly visible once you open the fuse box. Having zero experience, I went upstairs and noticed that none of the LEDs were on when I accessed the zoning board. The low voltage wires are connected wrong and the 3 amp fuse is blowing 3. Make sure to insert another 3 amp fuse in the board. The house wasn't heating, it was just pushing air. If you find the low voltage wire at the condenser is the reason your 3 amp fuse is blowing here is how to repair it. I checked the thermostats because kids and nothing was displayed in the little digital screen. I first noticed the issue over the weekend when I didn't hear the fan shut off. I've checked the high limit switch and it appears good as well as the contactor and wiring outside. I have pulled my thermostats off the walls to ensure that there were no exposed wires that could have caused a short as well as checked the thermostat wires coming out of the zone box. I have attempted to replace it twice hoping that would correct the problem, but after reading online today, it's not that simple. I have a Rheem heat pump that has blown a 3 amp fuse.
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