Question about Heating & Cooling

1 Answer

Armstrong air tech 91 furnace problem

I have a light that is flashing three times which indicates that the pressure switch is open and should be closed. how do i close it?

Posted by on

  • bvn2002 Jan 22, 2009

    I had the same problem

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 306 Answers

Sounds like the flue is plugged, I had same problem and opened up the draft fan and there was a dead bird restricting the flue. Furnace will never light if the pressure switch never closes as you have found out. Also has anyone moved the switch some are position sensitive meaning have to be in same position factory set the switch. I had one like that also switch was little crooked so I straighten it up and walla worked.

Posted on Nov 23, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Indicator blicks 3 times replaced combustion air switch but did not resolve problem. what do i do now?


There should be a diagnostic chart on the furnace door by the wiring schematic. If so see what the code reads for three blinks.
By the term "air combustion switch" I guess you are referring to the pressure switch. Most diagnostics blinking three times is just a dirty flame sensor. If this is the case the burners will light and go out within 4 seconds. If this is the problem carefully remove the flame sensor and clean gently with emery cloth, fine sandpaper or fine steel wool. Reinsert the sensor and enjoy your heat.

Feb 14, 2014 | Coleman 7990-319p Evcon Gas Furnace...

1 Answer

Armstrong air furnace


Have you checked the flue inlet and outlet to see if it doesn\'t have a wasp nest or bird nest or rocks. check the hose that is attached to the pressure switch and the port on the collector box or inducer fan motor to see if it is clear. if you take the switch off and lightly suck or blow into the port it that will close the switch. If you have a manometer you can check the pressure differential. On the pressure switch it will say what pressure in will close at ...Example .52" WC. or 1.25"WC You would attach your manometer to the tube attached to the pressure switch and start the combustion blower to read the pressure. If you have over the reading and the switch didn\'t make you will need to replace the switch. if you have less than you have to make sure the flue is open. You can check the flue with a simple trick by unhooking the flue pipe from the combustion blower and then check the pressure and you may have to unhook the air intake also. If that doesn\'t work you could have a plugged secondary heat exchanger...... Good Luck.

Nov 12, 2013 | Heating & Cooling

1 Answer

Armstrong GUK125D20-2B won't ignite


Did he check the Pressure switch was it filled whit water can you make the switch open on the pressure switch when blowing on it? Is the hose from the inducer motor opened and not blocked ? also if there is a block after the inducer motor it will not Ignite. If the Tech does not know how to check a pressure switch get a new tech.

Oct 06, 2012 | Honeywell Furnace Air Pressure Switch...

2 Answers

Why does the led on my furnace control bd flash three times


Hello, this indicates a open limit switch. A limit l switch will open when the temp in the heat exchanger gets too high and this switch shuts the Furnace down for safety. Usuaully a dirty filter, weak blower motor, dirty blower wheel will cause a limit switch to open.

Nov 12, 2011 | Heating & Cooling

1 Answer

Gas Armstrong Ultra V Tech 91-Is green light supposed to flash?


Installed a new filter and furnace is running great now. The old filter was not that old, but we have been doing some remodeling and I figure that is what clogged it so fast.

Jan 10, 2010 | Armstrong H 67 1PH Bf In Line Circulator...

1 Answer

Armstrong v tech 91 furnace. will not make heat. when on unit runs continuosly no matter what thermistat is set at. could mother board be bad,replaced once already. cah this be done by the home owner to...


These furnaces goes thru 4--steps for complete run time.... step-1, the small draft inducer blower motor blows and prove thru the small air tube that sucks a switch close to tell the circuit board to go to step-2......the glow plug glows for 15 seconds and step 3 the gas valve opens and dump gas in the venturi tubes and lights off the glow plug and proves thru a flame sensor (pin with 1 electrical wire connection) on the last venturi tube which tells the circuit board to go to the last step 4--, to turn on the main blower fan after 90 seconds!. Where ever it stops at then thats where your problem is!

Sep 12, 2008 | Heating & Cooling

4 Answers

High limit switch open on armstrong furnace


If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.

David

Mar 23, 2008 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

905 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2180 Answers

Dan Webster
Dan Webster

Level 3 Expert

8205 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...