Carrier Natural Gas Pack: Smell & Soot on exhaust tube
The heater works just fine, heats well. CO detectors (nightHawk Digital) all read 0ppm. Noticed a pungent odor outside when heat is on and there is a brown coating on aluminum exhaust vent tube. This tells me the gas may not be burning completely and perhaps increasing my heating bills. I want to open the unit to check for air inlet restrictions & clean whatever may be dirty & interfering with the air/gas mixture. The gas pack is beside the house and easy to access, top comes off easily. Looking for pointers on what to expect & procedures for this service.? THank you
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Re: Carrier Natural Gas Pack: Smell & Soot on exhaust...
Time for a good cleaning. Make sure the heat exchanger is in good shape and is getting good heat flow over it to the exhaust. The odor may be an indication of a restriction in the heat exchanger, the flames are hitting something, improper air or gas adjustment or a blower not coming up to correct speed. You can access the heating unit from a side panel. Look for the exhaust port and start with that panel. Wasps nests are predominant in these things.
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Remove the panel from the heater section, you will need to watch what happends as there is a call for heat. There may be a light on the control board that lights up or blinks to indicate a call for heat. The inducer blower (exhaust blower) will start. INn a few seconds after the blower starts, the igniter will glow orange. After a few more seconds the gas valve should open and the burner will ignite. If the inducer does not run, you may have a bad motor or control board. If the igniter does not glow, you could have a bad pressure switch, bad pressure switch hose or a broken igniter. If the gas valve does not open, you may have a bad control board or bad gas valve. If you get no light on control board, bad fuse, bad thermostat or bad control board.
First make sure your gas is on. If that's not it make sure the pilot tube itself is cleaned out try tapping on the pilot head to remove any build up. The furnace on a call for heat will first start the combustion blower then start the ignition procedure, that first starts the spark igniter or glow plug then timed through the circuit board a short 3 second burst of gas after the 3 second burst if the flame sensor does not sense the flame a short purge cycle runs another 3 second burst of gas and then try's for ignition again. Knowing this the only thing it could be is a gas related problem either no gas or no gas making it to the pilot head or the gas valve itself is not opening so check the gas and the pilot tube if there fine then you're more than likely looking at a new gas valve. Sometimes tapping on the gas valve will free a stuck valve. Hope this helps and please remember to grade me.......thanks again
If the induction motor ain't going I would look for a blown 3 amp (purple) fuse on the control board. If that was good I would check if any of the roll out switches were tripped. If a rollout switch was tripped check or air restrictions somewhere.
Hi, what seems to be going on here is several things need to be checked. When a heater starts to slow down lets say, I would make sure 1st of all that you have a clean return air filter in the system. 2nd, make sure that the indoor blower motor is clean and running up to speed. Ruud and Rheem units collect dust very fast and the filter must be maintained. If this is all ok, depending on the age of you're unit, and if it is natural gas or propane, you're heat exchanger may be cracked or plugged with soot. I woul'd say that you need to call out your local gas company as they will come out free of charge if you tell them you think you smell gas and your heater is acting up. What they will do is come and make sure you have no leak and inspect it heating section. I would say you are in need of service. Burners may be plugged also. I would call out the gas company and they will tell you if you need a sevice call or hopefully they will find and make a repair rather then you calling out a Tech. Im not saying you have a gas leak but this will get them rolling on it and a place to start. If you are inclined to make these checks on you're own, look in the burner section when the unitis on and see if all burners are on with a nice blue row of flames. Look it over and see if the blower motor is clean. This is all very important. Please get back to me and keep me posted. Best of luck, Shastalaker7
many of the newer furnaces don't have a standing pilot. look to see if you have a gas valve with a knob on top that says off pilot and on. look to see if a tube the size of a pencil comes out of the valve and goes down by one of the burners, look to see if there is a little gold piece of metal tubing protruding down to the opening of the larger tube . that is where you place the match. i prefer to use a grill lighter. safer and positive flame. turn knob to off wait 5 minutes for any gas to disipate. be sure your incoming gas valves are all open . usually at the meter and one at the furnace. usually the handle is in line with the pipe when open. from the off position, turn the knob on the furnace gas valve to pilot position and push down on it as you turn. this lets gas flow to the pilot tube by the burner where you have you flame starter lit and waiting. once pilot lights hold down on button for 3 minutes or less. longer is better to be sure the thermocouple senses flame . then gently release the downward pressure and the pilot should stay lit and you gently turn knob to on. if pilot goes out you may have a bad thermocouple. be especially careful if its lp or propane as that gas does not disipate like natural gas and can virtually lay on the floor till ignited. also consider having the heat exchanger checked by a pro with a carbon monoxide detector. they do crack after a few years and can be deadly when they do. good luck
any and i mean any ac and heat company you call in the yellow pages can and will be happy to repair yor heater. parts are all generic. problem is the heat exchanger needs to be tested every year with a co detector so no one gets killed. thats pretty blunt but hey its true. gas is nothing to play around with.call the gas company and they will usually test it for you. maybe for free. all heaters work the same. stat says heat , if pilot is lit then thewrmocouple senses heat and oks main gas valve to open then burner lights and a while later blower comnes on and blows hot air into house. question is , are air and chimmney gases mixingin furnace? test with co detector.does flame lift on burners? observe and compare with your previoys observations. my gut feeling is that consummer reports says 9 to 13 years is a life span on a ne wunit , your messing around with a old piece of equipment. it doesn't care about your finances, it will fail and harm you when its time comes reguardless ....