I have a Carrier central air gas furnace. Before turning on the heat this year, I need to clean the filter. The furnace has the type of filter that you clean instead of change. I can't remember how to get the filter out so I can hose it down. Can you tell me how to open the furnace and take out the filter?
The two doors are removable. remove top one that has all the small openings where you see the flames at. This is done be grabbing handle and lifting bottom part can be pulled towards you.than bottom one can be lifted up also. be carefull sometimes the edges are extremly sharp and can cut to the bone. (i know from experiance.) I belive a disposable filter is a much better way to go. only get the cheap spun polyester ones not the high filtration ones.
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If this is a gas furnace and you have a cooling coil on top then you could have a dirty coil. Also a dirty air filter can do this. I have also found dirty blower wheels. The gas furnaces have a high limit to prevent the heat exchanger from over heating. Another possibility is always a possibillity; however, 99% of the time I find an air flow issue.
It means that the furnace isn't igniting and for safety the control board is preventing the gas valve from opening. Turn off the power to the furnace for a few seconds then observe what the furnace does in heat mode. Some furnaces will run the blower for a minute after you power it back up. After that see if the furnace tries to come on. If you are still getting the code then one of you high temp limit or roll out switches has tripped. Now is the time for a service tech. Make sure that you check you filter and air flow too. Low air flow means the furnace may be over heating. The other thing is the hot surface igniter. Look closely at it with the power off. Do you see a white spot on the element or a crack. If so the HSI is bad. It's an easy replacement but DO NOT touch the carbon element with your fingers and be very careful handling it as it is EXTREMELY fragile.
either the gas at the outside valve is off, or the gas valve at the furnace may be off, or the switch on top of the gas valve in the furace may be off. if they are all on, then you may not be getting a call for heat from the stat to the furnace control board. check to see if you are getting a 24 volt signal from the stat to the w terminal and common terminal on the furnace board. if you are then check to see if the voltage is arriving as 24 volts to the wires at the gas valve itself . if it is then the gas valve is possibly bad. if it is not then the board is possibly bad.look for loose or broken connections on the low voltage wiring. most unusual that the board does everything else but send power to the gas valve. you need to zero in on the valve i think and start by turning off power and that should restart the sequence of operation and you can observe it step by step . if you are not getting a call for heat then the stat may be bad be sure you are in heat , fan in auto and temp pushed up to max. if no 24 volts is sent to furnace board white and common low voltage board then stat is bad. remove it if you think its faulty and jumper the white and red wires together on the subbase. that duplicates what the stat normally does. if the furnace lights its the stat. having said that i realize the stat has to be sending a heat signal or the other stuff would'nt start. so..... back to the furnace board. check that 24 volts in from stat and 24 out to valve and that will put you on your problem item. good luck
the hot serface igniter may nead to be replaced again . if the is a lack of air
[ have this checked} getting to and frome the furnace it may be causing the furnace to cycle off the burner duing call for heat. it recycles back on and off untill the thermostat is saticfied. this means you are reusing the igniter more often the once a call for heat . therefore shorening it life expectancy.. make shure you are not blocking the air flows with over filtering ..whitch i have found to be the most common mistake . this and not changing or cleaning air filters often enough.
Change the furnace filter. Make sure you use a cheap one when air conditioning, as the better ones restrict airflow when they filter out so much stuff and then plug up, not allowing enough air to pass over the cooling coil in the furnace's air plenum. Turn the A/C off for a few hours (with only the furnace fan on if possible) to melt the ice off the cooling unit inside the furnace.