Question about Heating & Cooling

1 Answer

Armstrong furnace G1D93: No heat, just humming. No error code are flashing. I have tried: --Change filter (somewhat dirty) --Reset rollout switch --Turn off, on --Trip, reset breaker --Flame sensor cleaned last week

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,515 Answers

Hi, I am surprised you have no error code on this furnace. Anyway, the sequence of operation, order of parts to start would be when you get a call for heating the first thing that will start is the small inducer or combustion vent motor. When you say humming, I think of the motor bearings out and the motor just sets there and hums. Before it will do anything, this motor must run to build pressure and vent old gasses, and to pressurize the box and close the pressure switch. When the pressure switch closes the board knows the motor is on and will start the firing sequence, pilot will glow or ignite and flame sensor will send signal to board or module to open main gas valve. Then after a delay, the large indoor blower will come on. Check this inducer motor to see if it is just stuck. It has a small fan in it you should be able to see and if the motor hasn't burned out you may be able to turn the blade with something to see if you can get it to spin. Do this with the unit off. If the motor just hums, it will have to be replaced. Remove it and take it to a heating parts house or appliance store and see if you can locate one. I am sure by the humming you are saying, the motor is stuck.Its the first thing to energize. I am sure this is your problem. Keep me posted.
Sincerely,
Shastalaker7

Posted on Feb 04, 2010

  • Robert Horton
    Robert Horton Feb 05, 2010

    I wanted to add that if the humming you hear is the small inducer motor and it is running, the pressure switch is open and should be closed. Find the tube that runs from the motor to the switch. The switch will have a couple of wires 24 volt going to it. You can take this switch and blow through the tube, motor end to free up the contact. You will hear it click. This should free it up and furnace should work. You can also jump from one side to the other with a piece of insulated wire and it will fire. Do this for a temporary fix only. If it fires the switch is bad. You should be able to free it up.Please let me know and I can help you get this up and running.
    Shastalaker7


×

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

I have an Armstrong SX Ultra 90 propane gas furnace that the fan motor will not shut off ,the thermostat is on auto.


Hit the side of the furnace. Some times there's a sensor inside that gets locked up from a dirty filter.

Oct 19, 2013 | Emerson Lennox Ducane Armstrong Furnace...

1 Answer

Armstrong furnace G1D91AU075D12B shuts off before thermostat setpoint ex. if thermostat is set to 70, furnace shuts off at 65 you can then turn stat off and back on and unit will start up again. since...


If your heat anticipator in the thermostat is bad or set at the wrong amperage, it could do just as you describe. If the air filter is dirty or the ducts are restricted, the furnace could shut down on high limit. I would check the air filter and replace if necessary. Make sure all registers are fully open and last, change the thermostat.

Jan 08, 2011 | Heating & Cooling

1 Answer

Model G5RA096C-16 motherboard light flashes one time pauses then flashes again and so on. The furnace turns on and blower turns on but does not heat. What does the flashing light mean?


Your furnace is off on a safety limit. Look for small thermal disks around the burner area they will have a usually red switch in the center and 2 wires coming into it. Reset this and watch furnace run. These are called rollout switches and they trip when you have flame rollout. SO WATCH IT RUN. If you have flame rollout you will most likely have a cracked heat exchanger if so you will need a new heat exchanger or new furnace. Next the number of flashes is important on some furnaces it will tell you what part is faulty. Count the flashes then on one of the furnace covers is the wiring diagram it will tell you what the flashes mean otherwise you can tell me and Ill help you out, WHen you reset the power on the furnace does it try to heat tell me what all happens when you shut the switch off then back on. when you turnit back on make sure the stat is calling for heat,

Dec 13, 2010 | Heating & Cooling

1 Answer

Coleman home heater stops working fault code "limit switch open"


How do you test a pressure switch and other limit controls?
This is for people who are experienced with electrical equipment and the use of a Volt Ohm meter. *Please never by pass a pressure switch or limit control. The pressure switch and limit switches are there for your safety. You would test by setting your volt meter to "Volts AC" and test the rollout switch by placing one meter probe on one terminal of the rollout switch and your other meter probe to a good ground. Have the red probe touching the top terminal of the rollout switch and the black probe touching a ground (body) of the furnace. You should be getting 25.85 volts which means the rollout is good on the top terminal. I would next test the bottom terminal of the rollout by touching the red meter probe to the bottom terminal on the rollout switch and the black terminal to ground. If I get 25.85 volts on the bottom terminal the rollout is good. If I do not get any voltage on the bottom terminal then the rollout has tripped and can be reset (if equipped) by pressing in on the little button or replaced. If your rollout switch is tripped you probably have a stopped up heat exchanger or a leaking heat exchanger. I would recommend calling in a service technician to find out why the rollout switch tripped. If you have an open limit control either the furnace has over heated or the limit has gone bad. Problems that would make a limit open up would be dirty filters, dirty evaporator coil causing a restriction in the air flow or a slow blower motor (check the capacitor on the blower motor to make sure it is good). A weak blower motor capacitor will cause the blower to run slow and eventually fail. Pressure switches, and limit switches can be tested with a meter in the same manner. With the furnace calling for heat you can test each of the terminals on the pressure switch to ground to make sure the pressure switch is closed. You should be getting between 24 to 28 volts from each terminal to ground if the pressure switch is closed. If the pressure switch is open you either have a stopped up vent, drain line (if you have a condensing furnace) or bad pressure switch.

Nov 27, 2010 | Coleman 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

Arcoair central heat /air conditioning unit


The blower motor kicks on when there has been a 24 volt control failure.

This usually means that a limit switch has tripped.

Most likely that would be a high temp limit switch or a rollout switch.

First, make sure the filters are clean. and the evap coil is clean. If eaither are dirty/clogged, it will partially block airflow, causing the furnace to overheat, causing the high temp limit to trip.

A rollout switch typically trips for three reasons.
1 flame rollout into the burner compartment due to poor airflow.
2 overheating af teh metal plate the rollout is mounted to, due to dirty, old, rusted components.
3 a bad limit switch.

If your unit has an LED light, count the flashes and it will hepl popint out the problem.
(locate the wiring diagram/flash code list, and correspond the flash count, with the code.)

First, check filters.

Jan 14, 2009 | Heating & Cooling

1 Answer

Coleman Evcon Furnace Model G8T10012UHB11A


you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

Oct 25, 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:

191 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2457 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 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...