Question about Heating & Cooling

Open Question

I have a Lennox G20Q3E-75-4 the blower run but the pilot and main burner want light. There is a fuse next to the blower control board which was blown replaced it and it blow right away after closing the safety switch in the blower compartment. At this point I'm out of ideas please let me know what to check

Posted by on

Ad

6 Suggested Answers

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

Ad
kstfas
  • 75 Answers

SOURCE: Air Conditioner malfunction

Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

Posted on Sep 23, 2007

Ad
hotuna
  • 288 Answers

SOURCE: MHU 75 Model Mr. Heater

The roll out switch is a small disc shaped part about the size of a nickle. There may be more than one. anyway there is a button shaped like a small peg in the center if it, push it in and it should stay in. You may need to re examine the limit switch, because this is what it sounds like. they are rated for a set temperature, so your application may need a higher temp. A simple way to check parts like these is to by-pass them by taking the wires off the part and connecting them together. If this solves the problem, that it. My only concern is that this is a new installation, and maybe its not venting adequately or its burning up all the usable air in the room. That's why most of these parts are on the equipment.

Posted on Dec 24, 2007

SOURCE: Pilot lights but main burner won't

sometime if the heater has been sitting for days spiders get into the burner area or the area between the tank and the burner and make a web blocking the flow. I have taken a compressed air in a can like the ones you use for computers laptops and blow air up the shaft and around the burner wait 2 minutes then try again. Sometimes it takes 2 or 3 blowouts to work. Put the air compressor right in the little gas nozzle that comes out to light the pilot for the best results

Posted on Aug 21, 2008

barkencoa
  • 3463 Answers

SOURCE: No power running to SERVIS washing machine

Try disconnecting the heater element first and see what happens if still same unplug motor and try again, it is a process of elimination.
Plz rate solution.
Thanks.

Posted on Dec 14, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Panasonic nn-p295 blows buss fuse when turned on for cooking

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer. But this is likely an inverter model, so it wouldn't have one and would be some other component in the inverter I'd say.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.microwavedisplay.com/safety.txt

http://www.microwavedisplay.com/disassembly.txt

http://www.microwavedisplay.com/doorsw.txt

http://www.gallawa.com/microtech/cap_test.html

http://www.gallawa.com/microtech/xformer.html

http://www.gallawa.com/microtech/mag_test.html

The best place to order Sharp parts is Tritronics. Or you can call them toll-free at 866-779-5835.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 26, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Lennox troubleshooting


Your control may a defected relay to the blower under heating mode. If that is the case you will need a new control board or replay.

Feb 05, 2014 | Heating & Cooling

1 Answer

Lennox G20 gas valve switches off then on Intermittently?


This could be a dirty flane sencor of the pressure switch check hoses are tight and not spilt , try jumping out the pressure switch see if that makes it work also check air fliter is clean .

Feb 11, 2013 | Heating & Cooling

1 Answer

Lennox furnace model G11Q3-110 v.2 burners light but go out before fan comes on


Troubleshoot an ignition problem on a Lennox gas furnace ...

? 2:44
https://www.youtube.com/watch?v=yXIxgzwMkPs
Nov 17, 2012 - Uploaded by grayfurnaceman
This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...

Lennox Furnace Model G11Q3-82-2 - RepairClinic.com



Nov 19, 2012 | Heating & Cooling

1 Answer

Williams gas wall unit won't burn.


It's a burner control problem. It maybe a defect on some protective devices (pressure switch, fire detector, etc.), a blown fuse, or a board defect (busted DC supply transformer, relays, or electronic devices).

Nov 12, 2012 | Heating & Cooling

1 Answer

I have a Lennox Whisper Heat that when a call for heat comes, the pilot lights as it should, then after about 30 seconds the blower fan comes on, then its about another minute before the burners light....


Yes it should go in this sequence, first exhaust fan, after establishing air flow you get a pilot, after signal from pilot is established you get main burners, then they have to reach a set temperature on the high limit and then the blower comes in. Now you have several over heat safety sensors one of them could be tripped check by powering the furnace down and see if they have a reset button on them, some do some do not. If not it should be the sensors closest to the heat exchanger and blower assembly use a volt ohm meter and check them should be normally open until temp is established then closed. This is easier done than it is to describe, now locate the high limit switch and bulb and see if it is open across the contacts it should be until it hits temp then it closes to start the blower. Hope this helps instead of confusing the hell out of you. Take your time locate the items then test.

Dec 19, 2010 | Heating & Cooling

1 Answer

Lennox Model G12Q3-82-1 Gas Furnace pilot light extinguishes each time butrner cycles off afrer heat cycle


Hello,See if it is blowing out.Relite the pilot and run the fan(blower) with out the main burner running.A cracked heat extanger will be the cause if it blows out.

Oct 29, 2010 | Heating & Cooling

1 Answer

Lennox diplomat furnace will not always ignite. I have cleaned the heat sensor and ignitor. Could ignitor be going?


Maybe, look for bad wiring connections and retighten the ground wires from circuit board to cabinet. Take a can of air and clean the burner tubes being careful not to blow on the igniter. Are ther any error codes blinking when it does not light? Read on for some more tips.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Dec 29, 2009 | Heating & Cooling

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

Related Topics:

192 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2557 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...