Furnace Problem

Old 12-03-02, 07:15 AM
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Pilot On Furnace Won't Kick In

Have an older model furnace, not sure brand name. The pilot is on and the thermostat was replaced last year. The furnace went out yesterday. When I turn the thermostat I'm not getting a clicking noise and can't hear anything kicking in. What are other possible causes if the thermostat checks out O.K.
Old 12-03-02, 11:36 AM
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Several Possible Problems

Hello Ron. Welcome to My Gas Appliances forum and the Do-It-Yourself Web Site.

Most likely the thermocouple is too weak to produce the current needed to keep the gas valve opened or the thermocouple is simply burned out from normal usage.

Replacing it should resolve the problem. The thermocouple is the part the pilot flame is in contact with. The opposite end of the thermocouple is threaded into the gas valve. This end must be carefully unscrewed out of the gas valves control using a small open ended wrench.

A thermocouple is generic except for it's length. Thermocouples are made in different lengths. Measure the removed part or take the one you remove to any hardware store and replace it with an exact duplicate in length. The parts cost is very nominal.

New thermocouple packages will contain complete do-it-yourself installation instructions and pictures. The package also contains additional clips of various assortments.

Not all the parts contained in the package with the thermocouple will be needed. The packages contain an assortment of holding parts and clips that are generic and designed to fit a wide variety of applications.

For more detailed information etc. read the recent postings within this forum and those within the heating and cooling forum. Many questions already asked describe like or similarly related problem descriptions as your question.

These prior postings and any or all the replies offered within them contain almost all the required information needed pertaining to the possible problems with the heating unit like your describing.

To help you resolve the problem more quickly, search this forum and also within the heating and cooling forum for topics & subjects related to Heater, Heating and or Furnace Problems.

In doing so you'll find the same or similar question asked. The reply or replies contained within the questionasked will be all of the possbile solutions.

The "Search" option is a button way up on this page in the right hand corner of this page in the blue selection.

Printing the pages of already asked questions pertaining to the problem will provide all the possible causes & correctional possibilities at one time.

The printing option selection is a blue link provided way below. Scroll down this page and look for the wording "Show Printable Version."

An excellent source for orginal replacement parts is your local retail appliance parts store. Parts dealers are listed in the phone book under appliances.

Retail parts dealers can also help determine what the possible problem may be. Bring the make, model and serial numbers. The information will help to determine the possible problem causes.

Regards & Good Luck, Forum Host & Moderator.
TCB4U2B2B Company Enterprises. Energy Conservation Consultants & Gas Appliance Diagnostics Technicians.

Last edited by Sharp Advice; 12-03-02 at 05:08 PM.
Old 12-03-02, 12:08 PM
Rick Krakora
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I had the same thing happened to me a few weeks ago....as the problem is the thermocoupler....which it "watch" the pilot flame as well as to maintain it is still burning.....as you need to check to see if the pilot light (flame) still on...and if it doesn't stay on or whatever, replace the thermocoupler....but be real careful with it because if you kink (dent) it, it will damage and won't run properly...

Thermocoupler is a piece of metal rod that stick out right next to the pilot light as well as it has thin copper tubing that run back out to the gas regulator inside the furnace...


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