Question about Heating & Cooling
If the flames are yellow AND lazy, not acting like the two blue flames are, the problem sounds like excess carbon build up within the heat exchanger ABOVE the two yellow burning burners. If that is the case, the yellow burning flames are contributing additionally to the carbon already in there. Eventually, the lazy flames will roll out into the furnace vistibule and possibly burn wiring creating a major problem. There are looooong wire handled bristle brushes 30" long that must be used to thoroughly clean the heat exchanger after the burners have been removed. A shop vac will help greatly in reducing the nasty carbon mess.
Usually, the vent collector hood and flue is removed to brush down from the top and up from the bottom alternately. If there are air shutters on the burners, make sure they haven't been throttled too far down limiting the combustion air causing the original problem.
You need a certified HVAC service tech to look at this issue.
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Posted on Jan 02, 2017
SOURCE: yellow pilot on heater
posted on May 06, 2008
Rating: 90%, 19 votes
All it needs is a good blow out with compressed air. They tend to carbon up in the pilot light area. You will probably also find it is very dusty inside. Easiest way to clean the carbon out is to remove the hose at the heater and with compressed air blow through the fitting where you have removed the hose. Make sure you hold down the start button so the air can get through to the pilot light and jets. Don't connect the electricity for the fan when you do this. If you can get to the top of the pilot light it may help to give that a blow out too.
To clean it out internally you only need to remove the front panelling. Just follow the screw configurations *** you go. I asm not familiar with that type of heater so thats about the best I can do. Regards Bryan
Posted on May 07, 2008
if the gas pressure is good on inlet and outlet of valve u might wanna chk the burner trays and manifold for flakes, dirt, spider webs ect... once u kno the passages are clear from obstruction you can focus on the mechanical. (sounds like gas valve may be getting weak and not able to open fully)
Posted on Mar 22, 2009
This sounds like a bad heat exchanger. It is possible that you do not see the crack because the crack is closed when the heat exchanger is cold (or room temp). Allow the furnace to heat up, this will allow the expansion of the crack. Turn the power off and examine the heat exchanger while it is still hot.
Posted on Apr 10, 2009
Hi, the howling you describe is pretty common as gas heaters first come on. NG or LP gas is delivered at a pressure much higher than appliances actually use, step down regulators lower the pressure as the gas flows. So, when you first turn your heater on, the pressure is a little high until the flow causes an equalization of pressure. You could contact your gas supplier and ask them to check your pressure and tell them you suspect a building regulator. If the pressure were to build too high it could cause leaks or damage the appliance controls. Good luck.
Posted on Jan 10, 2010
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