Furnace not lighting


Old 10-20-02, 01:56 PM
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Furnace not lighting

Hi. The burner on my furnace is not ingniting. It is a Carrier, 1993, Model 58PAV0075-HC, Serial #1893A13734, Natural Gas, located in the basement. It says it has an "ignition device which automatcially lights the burner." I do not smell gas. I followed the operating instructions and turned the gas control knob to OFF, let it sit for 5 minutes and turned the knob back to ON, but still no blue flame. The furnace will turn on for about 2 minutes and run with no flame, then shuts off. I have lived here for 5 years and had only one problem where I smelled lots of gas, but a heating and a/c technician came out and found no problem/made no repairs. Other than that, I have had no service calls for this unit. Any advice you can give would be very much appreciated.
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Old 10-20-02, 02:50 PM
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sounds like

the ignitor, this model is famous for it. see if it is getting voltage.if so replace it
Old 10-20-02, 03:05 PM
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How do I check the voltage? Is replacing the ignitor something I can do myself?
Old 10-20-02, 03:13 PM
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Hello Promolink2 and Welcome to the Heating and Cooling Appliance forum and our Do-It-Yourself Web Site.

Based upon the problem description, chances are the flame sensor is dirty, defective or has a poor electrical connection. Correctional methods for this condition are provided below.

The unit could simply be in a lockout mode. Try unplugging it for 5 minutes, then plug it back in and retry.

Below is a detailed list of additional information which may apply.

Electronically operated and controlled appliances often require several tests on several componets to determine the exact cause of a problem. The procedures and methods vary and at times can become rather complexing. Therefore, be advised that only your heating contractor may be able to resolve the problem.

Below are a few of the potiental and or possible causes for the problem description you provided:

If the pilot lighting system has an electronic sparker that lites the pilot flame, and there is no sparking, the sparking element and or electronic module are the most likely defective parts. Clean both the sparker and pilot assemblies first and retry.

Also check for a good electrical connections, etc. to the sparking device, spark module and the pilot flame sensor. If the pilot flame is lighting but the burners fails to lite, a poor electrical connection could be the problem.

The wire that should be cleaned is usually green in color and attached to the sparker module. The other end of this wire will be attached to the furnaces frame.

Be sure the terminal connection is clean and free of any rust and or corrosion. Wire brush or use sanding paper to clean the effected area, then reattach the terminal end exactly as you found it prior to removal.

The pilot flame sensor sends a signal to the main electronic sparking module or control circuit board that a pilot flame is established. The pilots flame will be heating the sensor element directly. If the sensor is dirty, clean it as described below.

Once the signal is received at the main spark module, the main module allows the gas valve to open, sending gas to the burners. If the signal is not sent or recieved, the module will not allow the burners gas valve to open. Therefore, either no burner flames or the burner flames will cycle on and off intermittently.

Below is a list of some of the possible problems and solutions for heating appliances using a Glow Bar hot surface ignitor type ignition system. Pick and choose which type, problem or condition applies to the heating appliance you have.

Defective Glow Coil:
The glow ignitor may glow but just be too weak to allow current to continue to flow to the magneto coil and other parts it supplies current to.

The glow ignitor may not be functioning. If it fails to glow, chances are it's burner out. Replacing the Glow Ignitor {Hot Surface Ignitor} may solve the problem.

The main computer circuit board also controls and regulates functions of the heater. It too may have a defective componet.

Defective Solenoids:
The solenoid is inside the body of the gas valve body. Solenoids also supply voltage to a glow ignitor, {if applicable} gas to the pilot flame, {if applicable} main burner gas and or other parts and componets within the entire electrical loop.

Defective Gas Valve:
Remove entire unit as an assembly. Take the entire assembly to your local appliance parts store for testing. Gas valves are not repairable. Replacement is the only option, if defective.

Do Not attempt to repair the gas valve.
This is a NON repairable item!

The ideal method for determining if either the solenoid, gas valve, gas valve parts, electronic parts or componets, circuit boards or other componets are defective, is to remove the item or items.

Take the entire assembly and or componets to the local retail appliance parts store or heating appliance dealers retail store and have the entire assembly and or parts inspected and or tested, as needed.

Flame Sensor:
This part is located on the burner or near the pilot assembly. If it's defective, it will cause the gas vale to shut down or not function at all or cause the problem your describing.

The flames sensor element, is the part which the pilot flame heats once a pilot flame is established. Cleaning the flame sensor element with fine grit sanding paper or steel wool may solve the problem.

Not all furnaces have a seperate flame sensor element. If your heater is equipped with one, insure the flame sensors element is connected securely and correctly in the pilot assembly, is being heated by the pilots flame, is properly connected to the computers module or spark module and that either or both module is in turn grounded well and correctly.

Be absolutely positive the electrical power is turned OFF before attemping ANY repairs!

Read the RECENT postings within this forum and in my Gas Appliances forum on this topic of heaters and the replies offered. Doing so will provide you within additional information offered by other heating professionals.

Regards & Good Luck
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Energy Conservation Consultant & Natural Gas Appliance Diagnostics Technician.
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