Goodman GMP050-3 gas furnace won't start

Old 12-04-13, 12:02 PM
Thread Starter
Join Date: Dec 2013
Location: USA
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
Goodman GMP050-3 gas furnace won't start

Greetings all,

Each year I clean the flame sensor with sandpaper before winter comes. I've never run into an issue until this year. After cleaning the sensor and re-installing it, the furnace will not start. Looking at the control board, the status light continually flashes a fast red.

I have done the basic reset of lowering the temp on my thermostat, unplugging the unit, waiting for awhile, replugging it in, and then raising the the temp on the thermostat. I still receive the same error and nothing happens.

The connection to the flame sensor seems good. I didn't monkey around with anything else in there. Did I touch the sensor to something to cause this problem?

Any ideas?

Old 12-04-13, 10:32 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,136
Received 3,996 Upvotes on 3,586 Posts
Welcome to the forums.

For your unit a fast flash signifies a wiring problem with the main power or transformer leads reversed.

Has any wiring work been done previously or during the summer that may have affected this ?
You may need to check power and ground to your unit.

The current problem is not flame sensor related.

The link below is your service manual.

Goodman GMP_Series.Pdf

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: