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Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
Remove furnace panel and hold or tape door switch in and then check between R and C on furnace board and let me know if you have 24 volts ac.
Take your time.Come back here when ready and we will go from here.
Ok look on control board for a small 3 amp auto type fuse and see if it is blown
Look and see if fuse blew again.If not check the flame rollout switch above and beside burners to see if red button in center will push in to reset
Resettable limits will be near burners. Part 151 in picture below
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.
See picture below,red buttons should push in if one is tripped
Ok turn power off and back on to furnace and see if code goes away.
Check between R and C on board again and between R and C where wires connect to receiver
Ok is there anything in the circuit between board and receiver? If not we should have 24v between R and C at receiver terminals
I am showing the receiver to get 24v directly from furnace board. I am going to open this to other experts who may be more familiar with what you have.
Not sure about the 3 and 5.I do not show numbers, Did it work like this before?
I don't think I would change them. Just need to follow the wires and see how they have this wired.I have never seen one where they left old thermostat in circuit
I have opened up to other experts who may have more ideas.If I am online wen you come back we will try to figure out what they have
Are you able to follow that C wire from furnace and see where it goes?
I think at this point since it appears they have it wired through a component rather than directly to receiver you may be better to call in an onsite tech. My first thought is to tell you to run a R and C directly from furnace to receiver, but am hesitant to tell you that not knowing what else they have wired in.
WE need it to also go to receiver, but cant understand why it worked before like it is
Furnace should supply 24v to receiver from R and C
R to R and C to C
I really am not sure from here.I can request a refund if you would like since no one else has any ideas either.