When I replace the metal cover on the unit the the gas flame comes on turns blue and right before the blower kicks on the flame goes out and the blower just blows cold air. When the cover is off or even just not completely covering the opening the unit has no problem. What do I need to check?
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Hi, I don't know if you are still having a problem, but it sound like the flame sensor on the unit is dirty and need to be cleaned. If it has a automatic pilot, it will have a flame sensor. Its made of porcelin with a metal rod coming out the end, laying next to the pilot flame. Just 1 screw holds it in place. Remove it and clean the tip with steel wool or a piece of sanding cloth. If you don't have this set up, I would need more info on the unit, model and serial number. You may also have a faulty thermostat, but I do believe it is a flame sensor. Shastalaker7
Hello. The first thing you can do is check the flame sensor, this is a small metal rod on the opposite side of the ignitor, Turn off power to the unit remove flame sensor and clean it with some steel wool. Also check the flame sensor to make sure there are no cracks in the base of it, if so then replace the flame sensor. If you have checked the flame sensor and the problem still continues you might have a problem with the unit not being grounded properly, you should have a ground wire coming from the main electrical panel to the furnace. If the ground wire is there and problem continues the control board should be replaced. I hope this helps.
If this has an igniter could be flame sensor. Flame sensor
tells gas valve that flame is present or it will kick out. Flame
sensor should be small rod connected to one wire, and it is
on the flame somewhere sometimes opposite end from igniter
If you do have sensor turn power off remove sensor and clean
If white film on it. I usually clean it with dollar bill
Check your filter to make sure it is not plugged. If it is plugged - replace with filter recommended for your furnace. Every manufacture recommends you have your furnace checked and cleaned on an anual basis to keep itrunning safely and at it's top efficiency. If the filter is plugged or the blower wheel plugged, the furnace will shut itself off. Make sure all registers are uncovered - suppply and return registers.
Take the front panel off by removing the two screws at the top sides of the panel and disconnect the plug at the top right side as the panel comes forward. Now look at the heat exchanger. You will see a small rectangle of metal held on by one screw. Take the screw out and remove the metal cover. There will be a small window that you can look into and see the burner. Now cycle the heater and look thru the window for a faint blue color. It is hard to see the flame but you can see the color. If you don't see anything, gas is not getting to the burner. You can check to see if you have gas by removing an allen head screw on the gas valve and cycling the heater. If you hear gas coming out of the hole, quickly turn off the heater. If no gas came out, you will need a new gas valve. If gas came out, you have a blockage at either one of the gas tubes that attach to the heat exchanger or the burner has a blockage. At this point I suggest you call a technician. Always check the gas shut-off on the right side of the heater and any shut-offs at the gas meter or tank first.
hello there there is a flame adjustment screw that needs to be adjusted there should be a fuel valve that turns on the gas for the unit inside ofthe unit where the gas line goes in at there should be as a small brass round cover just after this under the cover has a flat tip screwdriver slot insert the screw driver in it and turn counter clock wise to adjust ok best regards rich
This is backwards. The blower comes on first then after the air pressure is good in the exaust it will turn on the power to the ignitor and open the gas valve. If it is doing what your describing there is something wrong with the way it is wired. But many times people will mistake the noise of the blower comming on for the flame and the sound of the gas valve and the ignitor for the blower kicking in. This is probally the case. If you have water in the fire box this is a much bigger problem with your heat exchanger and it will do damage to other components. If this is the case it is time to replace the heater. All of this is symptommatic of bad water chemestry and you will need to address this or you will damage the new heater and chemecal damage is never covered by warrenty. Good luck.
sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries to relight 3 times then locks out on fail safe. the blower will sometimes run continually once that occurs to highlight a failed condition. every time you reset it will try again 3 times then shut down. lp gas is very dangerous, even i do not work on it as the gas acts like gasoline and lays around. not like natural gas that disperses well. if you see the flame sensor try gently cleaning it with a little emory cloth. also a loose ground can cause this. check tio be sure any green wires are snug , they actually flow volts to ground through the flame on some to proof, thats why no ground no flame. if that fails then the board is most likely problem. change wire for wire , or get generic replacemant and follow directions exactly. good luck.some ignitors act as a flamre proofer as soon as they are done igniting! rarely do they fail to perform both funtions.
Remove the front panel. Tape the door switch to the closed position. If the thermostat is calling for heat the furnace should do the following: a light on the circuit board will flash and then the exhaust blower will start. A few seconds later (10-15) you should hear clicking at at the circuit board and an orange glow should be seen thru the small viewing port. A few seconds later the gas valve should open and the orange light will turn blue. If the blue flame only lasts a few seconds and then goes out, their may either be a blockage not allowing the flame to travel to all the burners and not allowing a flame sensor to sence flame, shutting down the unit. After a few cycles of not starting, the circuit board will flash a series of codes that you can read if you look on the back of the front cover. It will give you a starting point where we can research and come up witha more difinitive answer. Let us know what you find for codes.