I NEED INSTALLATION INSTRUCTIONS FOR A GOODMAN FURNACE MODEL GMP-100-4

Goodman GMP Series Installation Operating Instructions Manual

Hopefully this helps.

Check gas pressure. If no gas, new valve doesn't help.

have someone check refrigerant charge

Hello, what seems to be the problem with the Furnace?

Not an easy task! Take many pictures as well as draw out and mark which wire went where. You will have to remove everything from inside the cabinet to get to the heat exchanger. It may be easier to replace the furnace. If you are paying a professional to do the exchange, figure three hours if they have done it before, if not figure 5 to 6.

Take the top panel off and on the inside of the left side of furnace as you are facing it should have a nameplate rating.

The nameplate rating should have the model number and serial number of the actual unit that you have.
It will list BTUS/Electrical Amps.

Usually you can find the control board on the lower part of the furnace. Turn the power off and remove the
doors. This board is usually located directly in front of the blower motor.

On the control board locate the terminals marked heat/cool/park and Park Lets say the Heat Terminal
has a red wire attached to it and you want a higher
speed.

Red is uasually low speed, remover the red wire from
heat terminal and exchange it with a wire attached to
a terminal lab eled park. Black is usually high spped

sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition

Sounds like the fan switch on the furnace is set to low. Turn power off to furnace, take door off of furnace look for a fan switch, it may be a fan - limit together. The limit settings should be approximately 160° to 200°, and the fan settings should be about 100° to 140° set it to 120° it it's already set there then you probably need to replace it.

I don't know where you are located, but there is a Goodman distributor in Sacramento, CA. Also in Ontario CA. They are a distributor so they may be able to help you or tell where to find someone who will help. Goodman is also known as GMC or Janitrol.