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If you’re sure there is no air coming out of the air vents, you will be going to the indoor unit usually the attic or if you’re lucky yours could be in the garage.

Remove both panels from the furnace

Check the little 5 amp fuse in the circuit board.

If its bad, replace it put your panels back on and restart the matrix.

If the fuse keeps blowing instantly or every time you try it, you have a short move to page 26 now.

Let’s find the short in 26

If the fuse was still good then, jumper the door switch, so the system will turn on.

(Note: Since we interrupted power we could have to wait for a new 5 minute time delay.)

Once 5 minutes has elapsed grab your volt meter and get ready to start tracing your electric trail.

Now your volt meter, test for 115 volts coming into the circuit board.

NO I do not have 115 volts…. Then go to step 33 now

Then Click Here to go to step 33

Yes I do have 115 volts entering board……Then continue the trail

Do you have 115 volts leaving the board to the transformer?

No 115 volts does do not go to transformer. Then you have a bad circuit board move to page 29

Let’s replace a circuit board

Yes the transformer has 115 volts…continue the electric trail to find the right repair

Do you have 24 volts leaving the transformer?

No 24 volts leaves the transformer, then you have a bad transformer….move to page 30 now

Let’s go replace a transformer

Yes, then you know what to do…keep reading

Do you have 24 V at C and R of the control board?

No 24 leaving board – Then since we know the transformer put out 24 volts to the circuit board but no 24 volt leaves we know 100% this is a bad control board so move to page 29 now.

Let’s go replace the control board

Yes, I have 24 volts at terminals C and R….then keep going

Do you have 24 volts at C and G?

No 24 at C and G…you’re in luck it’s only a bad thermostat so move to page 32 to change a thermostat.

Let’s go change a thermostat

Yes I do have 24 at C and G…Then Yup, continue the trail

Do you have 115 volts at the Neutral and Cool or High of circuit board?

(Note: some circuit boards have a cool terminal and some may be labeled high but all were trying to do is test for 115 volts leaving the board to the blower motor.)

No, then it’s a bad circuit board…. move to page 29 now and you’ve located the problem.

Bad Board, Lets go change it

Yes, the motor wires are getting 115 volts. Then continue

Ok the motor has power but it does not spin hum.

Check the capacitor for the blower motor.

(Note: To test a capacitor, remove all the wires from capacitor, set meter to mfd and place a lead on each terminal of capacitor. Now compare the capacitors stamped rating to the actual output. If output is less than 10% of its actual rating, its bad and needs replaced.)

The capacitor is NO good it tested under its rating….Move to page 4 now and replace that capacitor.

Let’s replace this capacitor

The capacitor is ok…then you have a bad blower motor so move to page 31 now and you’re almost done.

Let’s replace the blower motor