Question about Heating & Cooling
The glow rod will lite then go dim a number of times then the burners try to ignite but wont stay burning its also clicking when its trying to ignite
Hello, if the burners light but do not stay on for more than 10 seconds, I would clean the flame sensor. The flame sensor is a metal rod that is on the opposite side of the Igniter, sometimes it gets coated by oxidation and does not sense the burner flame and shuts the Furnace down. To clean to kill power to tje furnace, remove flame sensor and clean with a steel wool, then reinstall and start Furnce back up. If this does not work then most likely the Igniter is too weak to ignite the gas and will have ro be replaced.
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
If the igniter lights the burners the ignitor..... is not bad. Its like a light bulb.... it works or ot doesn't.
You are describing a dirty flame sensor. Dishonest contractors will sell you a new ignitor but clean the flame sensor when the are installing the ignitor. It is located at the opposite end of the burners than the ignitor. It has one wire going to it. Remove it and clean the rod with a piece of fine grit sandpaper. this should be done every year before heating season.
Posted on Mar 29, 2009
There is a vacuum sensor on most units tied from the exhaust gas fan to the sensor. Does the unit try to start? If the unit's exhaust fails to pull the switch it will turn off after about 30-45 sec after starting. "IT" thinks it's not exhausting and stops to keep from overheating. Do you have this exhaust fan and rubber hose to sensor? Can you see if that fan is turning on start?
Posted on Nov 10, 2007
Test while the unit is firing with a meter. you should have 24 volts going to gas valve. If you do and no gas is coming out, you have a bad gas valve. You will need a gas pressure test kit to install a new one correctly.
Posted on Dec 01, 2008
if you have replaced the flame sensor and it will not stay lit, the draft safety switch may be opening. It works on positive and negative pressure created by the inducer fan motor.You may have a restriction in your heat exchanger or if is a high efficiency furnace, it may not have the drain tube installed properly with a trap. The trap works just like the trap under your sink and if water isnt in the trap, the pressures can be effected enough to open the draft switch(some call it an air pressure switch)
Posted on Jan 07, 2010
Another part that you might want to check is the flame sensor. It is a very good chance that this is the problem, the stat calls for heat, the induced draft motor (little motor on from of furnace), ignitor comes on, the main burner fires, just for a second or two, the burner shuts down, the main blower motor defaults to blower on!
If this is the issue;
Then this is what you do to fix it, kill power to the furnace, look where the burners are, to the left side there is a little wire, usually yellow or orange running to what kinda looks like a spark plug, one screw should be holding it to the burner bracket. take it out, at the end of the white porcelain is a small metal rod sticking out, it probably has a slight bend in it.
take some steel wool, or sand paper and clean the rod till is is nice and shiny, NOTE: when you take it out, it won't look really dirty, maybe just like a pencil lead,,,,it is dirty!
Just use the sandpaper and clean the rod till it looks like metal, "do not sand the white porcilen". Put the part back in and turn the power back on and run the furnace as usual.
90 % chance that this will fix your problem.
The rod get a build-up on it from the sulfur that is added to the gas, and has a hard time passing the milli-volt signal back to the furnace computer, which is passed from the ignitor, through the flame, to the sensor! This way the computer knows that all of the burners are firing and it is safe to run!
Please take time to come back and rate me, or contact me with any further questions!
Have a warm day :)
Do not touch the ignitor! The part that gets bright and hot! Even when it is cold, the oil on your fingers will cause it to burn out.
Posted on May 03, 2010
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