So if my led light is off completely, even if board is receiving power and delivering power to thermostat (but furnace won't fire up, board relay clicks then fails x3 the no light until a hard reset) then this would indicate a bad board? Ordered another one but just double checking before i spend time rewiring to a brand new board
I have see the LED light burnout and the furnace work just fine. But that relay just clicking does sound a little weird. I would leave it powered on and jump the R and W terminals at the board...then just watch and see what happened as far as the sequence of operation. If you have already ordered a board then just see what happens with the new one. If i acts the same, sit down and watch it go through its sequence of operation.
@johnjennings-JJ just swapped out the board, all normal operations, fired up on the first relay click. LED is lit and solid. Glad it wasn't a bad fan motor or anything more mechanical. Probably intermittent power/voltage (enough to call for heat and supply the thermostat but not enough to get the motor to fire up). Sometimes it would work no problem, then once it reaches the desired temp and shuts off not enough power to turn the board back on (no LED, and fault button would yield no codes). Fuse was intact and all the voltage seemed correct so im stumped as to why it went bad. Will update in a few days if it goes back out then back to the drawing board.
Great teacher! Why the light is completely off in my board. The fuse is good I have 24v come from the transformer but I do not ha voltage in the thermostat wires…
Thank you. I know quite a few boards have error codes that say "internal failure" and replace the board. If you have 24v on the xfmr terminals that plug directly into the board from the transformer, and the fuse is good...🤔 ...maybe check the primary safety limits? Tough to say without knowing exact model, but sounds lile it doesn't have 24v power into the board. Most i know of will have light on if it has direct 24v to board even if a safety is the problem keeping voltage from going to thermostat. But if you know you have 24v going and no safety issues...sounds like could be control failure.
Excellent explanation. I have the same board for a GMC furnace, however I am trying to configure the Fan only mode to blow max speed of air, right now it blows only 30% airflow speed during fan-only mode (without heat or cooling). I do not have the manual. Have any advice how to make the fan-only mode to blow 100% airflow speed? Thanks. Also during heat mode, the fan blows at 100% speed. Edit: Alright I figured it out, I simply shifted both dip switches for the "fan dip switches" to the "ON" position, this made the fan speed go on full blast. Now, I can turn on FAN-ONLY mode (without heat or cooling) at high speed.
Never seen that one before. Not sure if I am reading you correctly but... yes... Those black boxes on the board are the relays. I don't know which one it is exactly but sounds like one of them isn't turning on your inducer.
You should be able to but in some cases the new settings might not take affect until the next cycle. You may have to turn power on and off to the unit in order for it to work.
Hey how you doing, my name is jaime i started watching your videos and you are a great teacher. Thanks , i have a question wheres that tech school your teachin in ? Whats it called ?
So if my led light is off completely, even if board is receiving power and delivering power to thermostat (but furnace won't fire up, board relay clicks then fails x3 the no light until a hard reset) then this would indicate a bad board? Ordered another one but just double checking before i spend time rewiring to a brand new board
I have see the LED light burnout and the furnace work just fine. But that relay just clicking does sound a little weird. I would leave it powered on and jump the R and W terminals at the board...then just watch and see what happened as far as the sequence of operation. If you have already ordered a board then just see what happens with the new one. If i acts the same, sit down and watch it go through its sequence of operation.
@johnjennings-JJ just swapped out the board, all normal operations, fired up on the first relay click. LED is lit and solid. Glad it wasn't a bad fan motor or anything more mechanical. Probably intermittent power/voltage (enough to call for heat and supply the thermostat but not enough to get the motor to fire up). Sometimes it would work no problem, then once it reaches the desired temp and shuts off not enough power to turn the board back on (no LED, and fault button would yield no codes). Fuse was intact and all the voltage seemed correct so im stumped as to why it went bad. Will update in a few days if it goes back out then back to the drawing board.
Hello John, nice tutorial!You are a great teacher. Would you mind sharing the diagram? Thanks!
Let me try to find that one and see if I can put it up.
John thanks for your videos.
I appreciate you checking it out.
Good video John you’re a great teacher
Thanks. Means a lot.
Great job John!
Good job John like your videos your a great teacher
Thank you. This was a looong one!
Amazing and the very best thrall diagnostic. Love this U DOING AMAZING FOR ME…..😂
Great teacher! Why the light is completely off in my board. The fuse is good I have 24v come from the transformer but I do not ha voltage in the thermostat wires…
Thank you. I know quite a few boards have error codes that say "internal failure" and replace the board. If you have 24v on the xfmr terminals that plug directly into the board from the transformer, and the fuse is good...🤔 ...maybe check the primary safety limits? Tough to say without knowing exact model, but sounds lile it doesn't have 24v power into the board. Most i know of will have light on if it has direct 24v to board even if a safety is the problem keeping voltage from going to thermostat. But if you know you have 24v going and no safety issues...sounds like could be control failure.
Excellent explanation. I have the same board for a GMC furnace, however I am trying to configure the Fan only mode to blow max speed of air, right now it blows only 30% airflow speed during fan-only mode (without heat or cooling). I do not have the manual. Have any advice how to make the fan-only mode to blow 100% airflow speed? Thanks. Also during heat mode, the fan blows at 100% speed.
Edit: Alright I figured it out, I simply shifted both dip switches for the "fan dip switches" to the "ON" position, this made the fan speed go on full blast. Now, I can turn on FAN-ONLY mode (without heat or cooling) at high speed.
Good video! Thanks
Great job , informative
Thanks.
The board has the inducer relay? 12 flashes “inducer relay error”
Never seen that one before. Not sure if I am reading you correctly but... yes... Those black boxes on the board are the relays. I don't know which one it is exactly but sounds like one of them isn't turning on your inducer.
@@johnjennings-JJ Found the solution to the problem, 12 flashes - Inducer relay error - in my furnace, the missing ground connection was necessary.
Grounding is important for furnaces. Thanks for the update.
Great job on the explanation of that board but one question does the Led light on the board always on when the unit is on.
Thank you in advance.
Yes, I believe the led does stay on as long as there is power to the board.
can I adjust Dip Switch while furance running?
You should be able to but in some cases the new settings might not take affect until the next cycle. You may have to turn power on and off to the unit in order for it to work.
Hey how you doing, my name is jaime i started watching your videos and you are a great teacher. Thanks , i have a question wheres that tech school your teachin in ? Whats it called ?
Thanks for checking them out. Hit me up on email at -------.com and I'll see what I can tell you!
Is this going to be on the test?
Always possible!