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you have 2 choices....the motor is going bad or the capacitor. Since capacitors are only $25 or less usually it is changed out first. If that fails to fix then it is a motor with bad windings or bearing drag
maybe we have a terminology gap here..
you say fixed speed...which means a standard motor and capacitor. Do you mean it is a x13 motor or ecm motor?
How many wires to motor
That still does not tell me what version motor you have.
see page 25,26, 27...HERE
page 25 on HERE...sorry
The unit came 3 ways...standard motor with capacitor, x13, and ecm.
Is page 25 in the b6bm manual your unit?
ok, the first part of the question listed model as B6BM
...."air handler b6bm-x60k-c with fixed speed blower motor running slow what to check"......
We need to verify which model you have. The **BM or **EM
I need to see what you have exactly.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here.
If you have an error code showing, tell me what the code read out is on the wiring diagram or a sticker next to the diagram please.
If there is no paper clip-icon, look for the '+attach files' link at left of your send button.
I can mark it up with trouble shooting instructions.
We can go from there.