Question about Honeywell Fan Timer Board St9120c 2010

1 Answer

The blower controlled by my Honeywell ST1920C controller will not start. I pulled the blower out and plugged it stright in and it works is it the board that is bad?

Posted by on

  • lrgraves Jan 30, 2010

    Thank you for your quick response. How do i jump the relay?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Honeywell Master
  • 43,501 Answers

Yes, the relay in that board does go bad. If the blower works then you know that it is good and if you have power going to the board and the blower does not kick on then replace the board.
I have already just jumpered the blower and left it run so people would have heat till I was able to get a new board.
This is a temporary fix that will not hurt anything, just use a bit more least you can get warm...


Posted on Jan 30, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Jan 30, 2010


    To jump the relay you just need to find the wire that hooks to the "heat tap" on the board.

    Then run a tempoary wire from the line to that wire and it will run your blower continously.

    What you are doing is just what you did to check out your blower.




1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I show voltage to the blower motor but it does not start when i press fan on the thermostat? Bad relays or bad blower motor?

Sounds like a bad motor. I don't know if your blower motor has an external starting capacitor and / or a running capacitor. If There is a starting capacitor and it's faulty , that would prevent the motor starting and turning.

Jun 01, 2014 | Honeywell R856B 1002 R856B1002 Fan Control

1 Answer

Blower on heat pump blowing with no demand

There is a contact in the blower control card that can stick on. There is also a possibility that the green wire which starts the blower motor could be shorting out with the red wire somewhere inside the thermostat wire. If that is the problem, either pull new thermostat wire, (the rest of the insulation is probably breaking down) or there is some new red link controllers from Honeywell that will completely eliminate wire because the controls are all wireless.

Feb 05, 2014 | Goodman Manufacturing Goodman GPH1348H41...

1 Answer


check the fuse in the compartment.

Feb 07, 2013 | 2008 Jeep Wrangler Sahara

1 Answer

Have old Carrier standing pilot furnace. Furnace calls for heat, but blower does not come on for almost 1 minute. How can I make blower some on sooner??

If it has a honeywell fan control, the cover can be pulled off and the setting can be lowered by adjusting the small lever on the dial, if it is a timed control it probably has no adjustment unless it was replaced with an adjustable fan control.

Oct 30, 2011 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

I have 1999 jeep grand cherokee and the heater blower,climate control,a/c,and heated rear window switches.have all stoped working. also how do you remove the centre bezel witch houses said items its a 4ltr...

I have the same vehicle,  to remove the centre mounting use a small hook ended tool, metal or strong plastic and start at the bottom of the fascia and pull outwards.  There are three retaining clips at each side, once the bottom two are off the rest pull off easily.

The non working switches sounds like a harness problem, it is difficult to think that all the fuses for each item could have fused at the same time, nevertheless check the fuses in the control box.  If you need a wiring diagram email me for a free one


Aug 25, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

I have a 1996 chrysler t/c . the front blower motor

the blower motor is probably starting to seize,and caused other problems

Aug 10, 2009 | 2002 Chrysler Town & Country

2 Answers

New climate control unit but when on blower not working for heat or ac

I'm assuming the problem is the blower motor isn't coming on or working. 1st, check the fuse. 2nd, remove the glove box or pull the 2 tabs that act like stops when it's open ( the glove box will open out further) and you'll see the power plug connector for the blower unit. Turn on the blower through the climate control (heat, A/C, or whatever) and wiggle the connector to see if the blower turns on. If starts working, then an easy solution is pull the connector off and gently press the prongs together or inward. Then carefully reconnect with damaging the prongs. This worked for 96 Mark VIII due to the fact the prongs were not "seating" correctly in the female connector. It's been about 2 years since I did this and the connection is still good. If wiggling the plug doesn't work, pull the plug, turn on the climate control (heat, A/C), and check for voltage to the plug. That's about all I can help with.

Apr 20, 2009 | 1998 Lincoln Mark VIII

1 Answer

Blower fan runs to long

ther might be dip swiches on the circuit board you might have to change

Dec 17, 2008 | Honeywell Power Humidifier: Furnace...

Not finding what you are looking for?
Honeywell Fan Timer Board St9120c 2010 Logo

Related Topics:

221 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Hardware & Accessories Experts

Gene Haynes

Level 3 Expert

5089 Answers


Level 2 Expert

112 Answers

Brad Brown

Level 3 Expert

15691 Answers

Are you a Honeywell Hardware and Accessory Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides