Re: GDS80904BXBC WILL FIRE FOR A FEW SECONDS AND THEN...
If it is the fuse on the furnace board,disconnect all low voltage wires to r-g-w-y-c.make sure you label where they go.jump out red to white if unit comes on and runs,chances are you have a bad t-stat wire or tstat.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
You can take each thermostat wire off the control board and use a ohm meter and test to ground, should not have any resistance. Another way is turn off power take each wire off the board, then place one wire at back on the control board terminals ome at a time, untill the one you get to the one that blows the fuse. If the wires check out good sometimes the thermostat itself can have a internal short and cause the fuse to blow.
try to determine if there is 120 volt power at the control board. Remove the blower door and test at the blower door safety switch. Sometimes the switch itself could be the problem. Also there is a fuse in the circuit board. Just like car type. Shut off power and pull the fuse and check. Replace if bad, if it blows again write back.
disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).
By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.
The short is on the 24V side...I would put a 3 amp fuse in series with the Hot 24v line before it gets to the circuit board from the transformer you will have to replace again....have a few spare fuses....after having done that./...turn the power on and call for heat...Observe what happens and what stage of the cycle you're in when the fuse blows...Exhaust fan starts...Ignitor starts to warn up....etc...I need more info...shorts are hard enough to find as it is.......does it blow the fuse immediately...usually it will go through a few stages before you get to the problem piece....Make and Model of the furnace could also be helpful to me
Check on the circuit board for an automotive type fuse that is probably blown. These fuses blow because of a short in the control wiring. If the fuse is blown a lot of furnaces run the fan all the time as a diagnostic. You will have to find the short or it will just blow again.
i would check your thermastat wiring if you blow the fuse you have a dead short those fuses are saving you alot of money. remove all wires from terminals for t stat on furnance and jump between r and w if it works your problem is in wiring ..........
when a fuse blows, its telling you that theres a fault. this could be a loose or broken wire.
or alternatively, the fuse rating is too low. you could check the wires are tight. and also possibly try fitting a 5 amp fuse. check first that the fuse is rated correctly for the appliance. usually 3-5 or 13 Amps.