SOURCE: thermostat
Several things cause fuses to go. But you ace in the hole is that it works for sometime before it goes out. This suggests that a relay or contactor is not pulling in as it should. I would try replacing the fan relay (if so equipped) and definitely the compressor contactor. If either of these try to pull in and are off center internally the result can be blown fuses intermittently.
DO NOT GO ABOVE 5 amp fuse or you may burn out the transformer.
The other things that can cause a blown fuse intermittently where your describing (although less likely unless subject to rodents and or high or low voltage spikes)
1 a temporary short in the control wiring (wire to or from the thermostat).
2 A short intermittent on the control board (if so equipped)
3 A relay on the control board or the SS circuitry is not operating with in design parameters.
I would really like to know what you discover the problem is.
If this helped you understand your system or problem please rate me as high as you can and thank you for using fix ya. Good Luck.
SOURCE: air conditioning runs all the time
I assume this is a manufactured home, this is probably a two transformer system, either your contactor is welded in the on positon or wyou have control wiring issues, (could be the thermostat)
SOURCE: thermostat keeps blowing fuses
There is a short in one of the thermostat wires. The fuse is triggered on the low voltage side of the unit. Replace the wires.
Testimonial: "Thanks for the info ,I will try this"
SOURCE: Our inside unit Coleman EB20B (outside unit
Hi,
Mark
all your wires using tape or by writing it down to ensure you will be
able to hook them back up exactly the way you found them. Remove all the
wires from your board again. Tape off the ends so you don't "short"
anything together. Identify the wires going to your outdoor unit and
the wires going to your thermostat. Hook the wires up one at a time
starting the with C wires and the R wires. Then hook up G. Then W. Then
O. Then Y.....and any other wires you might have. Check the fuse
everytime you hook up one of the wires. Remember to do the tstat and
outdoor unit wires one-at-a-time also..........meaning........you will
have 2 "Y" wires. Hook up only one, then check the fuse, then hook up
the other, check the fuse...........Eventually, that fuse will blow
again when you hook up the right wire. Then you will be able to
determine the color wire and whether it is the one for the tstat or the
outdoor unit. Once that is determined, disconnect that wire at the other
end and re-install the fuse and restore power. If the fuse blows, the
problem is in your wire. If it does not blow, it is most likely a bad
control coil. More often than not, it's the wire. Look for damaged
insulation and "crimps". Usually the repair can be made with simple
electrical tape and/or cutting the bad spot out, using a wire nut and
electrical tape, and testing it again.
Let me know,if needed further assistance.
Hope i helped you.
Thanks for using ' Fixya ' and have a nice day!!
Hi, I don't know if you are still having a problem, but it sound like the flame sensor on the unit is dirty and need to be cleaned. If it has a automatic pilot, it will have a flame sensor. Its made of porcelin with a metal rod coming out the end, laying next to the pilot flame. Just 1 screw holds it in place. Remove it and clean the tip with steel wool or a piece of sanding cloth. If you don't have this set up, I would need more info on the unit, model and serial number. You may also have a faulty thermostat, but I do believe it is a flame sensor.
Shastalaker7
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