8531 /Burner Issue UPDATE--Photos ( Fixed!)
With the furnace running, where do you put the pos and neg leads of the meter? Or can you do it at the Tstat inside with the furnace on? I want the 12v to the board, not the voltages the board puts...
Forum Discussion
Measure voltage at the leads that are supplying the furnace with 12V.
You should see a pair of heavier ga (14 ga, 12Ga?) wires which are not from the T stat that go into the furnace, typically they will be wire nutted on the outside of the furnace. You want to use both the pos and ground wires supplying the furnace. Grounding meter to metal anywhere else may skew the reading due to poor electrical connection from corrosion.
T stat wires going to furnace are typically lighter ga than the 12V supply from the fuse box (18ga, 20 ga, 22 ga?).
Can't take reading at T stat, on those wires one will may have 12V until the T stat contacts close when calling for heat.
You should see a pair of heavier ga (14 ga, 12Ga?) wires which are not from the T stat that go into the furnace, typically they will be wire nutted on the outside of the furnace. You want to use both the pos and ground wires supplying the furnace. Grounding meter to metal anywhere else may skew the reading due to poor electrical connection from corrosion.
T stat wires going to furnace are typically lighter ga than the 12V supply from the fuse box (18ga, 20 ga, 22 ga?).
Can't take reading at T stat, on those wires one will may have 12V until the T stat contacts close when calling for heat.
