Lennox furnace control schematics please

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  #1  
Old 10-23-04, 08:11 AM
Kevin Williams
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Lennox furnace control schematics please

Hi,
My Lennox furnace is not working properly.

The model # is g8q3-80-2

It was installed in Nov 1987.

The furnace relay is a Honeywell R8405B1009

The central air unit is a Lennox, HS18-211-9P

The thermostat is a White-Rodgers Type 1F80-54.

The furnace fan will not run in automatic.

The fan will run in manual.

My feeling is that I can troubleshoot the electrical portion with the proper schematics.

Does anyone know how to find schematics online?

Any assistance would be greatly appreciated.

P.S.
Received my journeyman electrician ticket in 1985 if you have any electrical challenges.

Thanks
Kevin
 
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  #2  
Old 10-23-04, 05:28 PM
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Hello Kevin. Welcome to the Heating Furnaces forum topic and the Do It Yourself Web Site.

Any assistance would be greatly appreciated. Glad to help as will many others and the diy pros, in this forum. I moved the question here from the gas appliance topic. Heat is gas granted but more heating pros here to offer you help, technical advice and assistance.

Where to obtain the wiring schematics may pose a problem, based on the number of years the furnace has been manufactured in. Might try a heating parts supply retailer or supplier to heating service companies store.

Doubt there would be any downloadable versions of the wiring schematics from the manufacturers web site nor any solutions to solve problems either.

However, the fan relay/tempt sensor/fan switch/ or whatever term is for the device or the unit has, is a likely cause. (Part has and is termed by several different terminologies) Suffice it to say, the device that senses internal firebox temp and triggers (turns on or signals) the fan to operate likely cause. That device may or may not be on the front of the heater.

May be a part of or on the main circuit board. You'll need to determine such and replace that part if possible, as a seperate componet, if it is. May need to replace the entire board.

Part(s) are available through heating part and or appliance parts stores listed in the phone book. They may or may not have the wiring schematics on CD and be willing to make you a paper printed copy free or or do so for a small fee. Ask them.

Check back on your question several more times. Heating professionals and other members posting replies in this forum topic may offer you additional advice, ideas and or repair methods.

Use the reply button to add additional information or questions. Using this method moves the topic back up to the top of the list of current questions automatically.

Be sure the electrical power to the appliance is turned off, the thermostat is turned down and the gas control valve is in the off postion before attempting any repairs.

Regards & Good Luck.
Web Site Host, Forums Monitor, Gas Appliances Topic Moderator & Multiple Forums Moderator. Energy Conservation Consultant & Natural Gas Appliance Diagnostics Technician.

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"The Life You Save, May Be Your Own."
 
  #3  
Old 10-23-04, 05:37 PM
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Wink

I have a copy for the G8Q Did you get my note Kev

ED
 
  #4  
Old 10-23-04, 05:49 PM
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Thumbs up Electrical Expertise...Great

Hi: Kevin

OOOPS!

Excuse me. I almost forgot to mention.

Electrical challenges?

Plenty on the web site in the two forum topics dealing strictly with electrcial problems and electrical appliances. You have electrical expertise? Great.

Welcome to help out in "Electrical" forum topic and "Lighting and Light Fixtures & Ceiling Fans" forum topic. Read our sticky notes too.

ELECTRICAL & ELECTRONICS
http://forum.doityourself.com/forumdisplay.php?f=131

ELECTRICAL
http://forum.doityourself.com/forumdisplay.php?f=9

LIGHTING AND LIGHT FIXTURES & CEILING FANS
http://forum.doityourself.com/forumdisplay.php?f=135

May find some posted into these topics as well from time to time:
PONDS & WATER GARDENS
http://forum.doityourself.com/forumdisplay.php?f=137

POOLS, SPAS & HOT TUBS
http://forum.doityourself.com/forumdisplay.php?f=54

KITCHENS
http://forum.doityourself.com/forumdisplay.php?f=74

AIR CONDITIONING
http://forum.doityourself.com/forumdisplay.php?f=126

HEAT PUMPS & ELECTRIC HEATING
http://forum.doityourself.com/forumdisplay.php?f=125

WATER HEATERS
http://forum.doityourself.com/forumdisplay.php?f=124

WELLS & SEPTIC SYSTEMS
http://forum.doityourself.com/forumdisplay.php?f=140

MOBILE HOMES
http://forum.doityourself.com/forumdisplay.php?f=63

ATTICS
http://forum.doityourself.com/forumdisplay.php?f=11

BASEMENTS
http://forum.doityourself.com/forumdisplay.php?f=12

BATHROOMS
http://forum.doityourself.com/forumdisplay.php?f=20

TRUCKS, RV'S & MOTOR-HOMES
http://forum.doityourself.com/forumdisplay.php?f=103

And that is enough just to get you started working........

Good Luck
Sharp Advice
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Personal Reminder:
Buckle Up & Drive Safely.
"The Life You Save, May Be Your Own."
 
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