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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Honeywell st9120u. 2x checked all wiring. turn on pwer and

Customer Question

honeywell st9120u. 2x checked all wiring. turn on pwer and blower runs at start and nothing else.
Submitted: 2 years ago.
Category: HVAC
Expert:  Phil replied 2 years ago.
Welcome! We keep going until you have all of the information you need.[b/]. Extensive training & coaching also available.
That model number is ***** computing.
If you can take a well lit, well focused, close up picture of the wiring diagram glued to the inside of the service panel, I can mark it up with coaching instructions. You will need a $30 type multi meter.
We can go from there.
Customer: replied 2 years ago.
How do I upload the photo
Customer: replied 2 years ago.
The part I replaced was the fan timer board.. The old board was a ST9160B1084. The new boards is a ST9120U.
Customer: replied 2 years ago.
R U there?
Customer: replied 2 years ago.
Photo up loaded
Customer: replied 2 years ago.
I do not have a multimeter
Expert:  Phil replied 2 years ago.
Hello again, thanks for wiring diagram.
To do this kind of work you need a multi meter and some practice using it.
Look this video over, let me know what you think, we can go from there.
We can go from there if you wish to do so.
Customer: replied 2 years ago.
I do not have a multimeter. I know how to use one but mine does not work. It will take an hour to get one and be back.
Customer: replied 2 years ago.
do you want me to do that?
Customer: replied 2 years ago.
I do have a voltage tester, but I do not think it works on low voltage.
Customer: replied 2 years ago.
It does not work on low voltage
Expert:  Phil replied 2 years ago.
Yes, go get a new multi meter, not the cheapest one, but one costing $30 or more.
I will hold the question open for you.
Customer: replied 2 years ago.
be back in awhile. asap.
Expert:  Phil replied 2 years ago.