I turned off the heat on a central heat/ac system this morning to access a sump pump that is located below the furnace system. I fixed the sump pump and now the heat will not come back on. Is there a reset button on central heat and air systems? where would it be located? Any other thoughts? We already checked the breakers. thanks.

Those are called 'flash codes' and are an aid to diagnostics. Google

make model flash codes

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What type of system do you have? Central heating and ac with gas furnace? out heat pump? If it's gas furnace then your thermostat might be set to heat pump and needs to be switched to gas electric. Other possibilities are short in the low voltage wiring or bad circuit board. Hope this helps.

Your furnace filter or A/C filter is located next to the floor in your cold air return into the furnace. Your other problem is your condensate line out of the A/C box that sits on top of your furnace is plugged. Replace your filter in the cold air duct, and remove your condensate line from the A/C box and blow air in the line to remove the clog in the line.

replace the fan motor as the bushes are dry and seized up.

Actually yes! You can install electric elements in the plenum that turn on by your thermostat. The convection blower from the furnace can be used. You can also install a heat pump system that will give you both heat and air conditioning.

Bad thermostat, improper wiring or bad circuit board in furnace. Turn off the disconnect outside.

If it does not have a furnace or heating elements for heating, then it is a heat pump, which is rare for a central AC system, but makes sense of the fact that it blows warm air when you reset the pressure switch, which may indicates freon pressure charge problem if your AC system has a reverse valve and uses freon to for heating (heat Pump).

Do you get heating when outside unit runs? if you do, check freon pressure levels and top up to required pressures. The button you depress is a pressure reset switch ... that is if your AC system is a heat pump ... which, as pointed above, it is not common for central ACs.

Are you referring a to an electric furnace providing the heat, the heat pump providing the heat, a heat pump providing heat usually with an auxillary/emergency electric heating unit, or an air conditioner with an electric furnace attached? If your system normally uses a heat pump for the heat normally, there is an eletric auxilliary heater. You'll probably need to turn it on at the thermostat manually when the outside temp gets below 40 degrees. If you have it nice system, it might do it automatically. If you're referring to the electric heater being rated 8 kw, it'll run using 8kw when you turn it on. It doesn't have the ability to change what heat rating it is. If you're refurring to the heat pump system being rated 8kw, you're probably mistaken. A heat pump might possibly consume 8kw to run the system but that can't be a measure of the system's capacity. Heat pump measurement units are rated in tons, but the system will always run at the same ton capacity whenever it's on, provided it doesn't need any maintenance. Some commercial air conditioning and heating systems have to ability to modify their power output based on the outside temperature, but I doubt you're dealing with that kind of thing.

If you have a Gas furnace in the Attic then the answer is yes. The outside condenser will not run if in fact you have a gas furnace.

This is not a lot to go on.

I assume since you called it a furnace, you have hot air heat and central air conditioning. If so, the only way a furnace/AC unit can generate water is by condensing moisture from the air. This is common to all air conditioning and removes humidity from your home. If so, this water, called condensate, must drain. The condensate is collected at the AC cooling coil that is typically located on top of a vertical upflow furnace or downstream of a horizontal furnace. If the drain is clogged, it will overflow and create a mess in and around the furnace. If this is your problem, cleaning and clearing debris may solve the issue. I suggest starting with the easiest accessable part of the drain path. You may need to open the panels enclosing the AC coil and clean the small pans at the bottom of the coil and clear openings from above that look similar to a laundry tub drain. If you get that far and find rust holes in the pan, repairs are needed. If you have an electric condensate pump that may also be the cuprit and require cleaning. Check and clear all drain lines from the coil connection to the final dicharge - sump pit or outside.