The furnace model# DGAA070BDTB will ignite then almost immediately go out it will the ignite again then go out then the blower motor will come on it will then try to ignite again with blower on til the unit shuts off showing a steady red blink for ignition failure i have replaced flame rod sensor checked voltages at limit switches and induction switch and fan and changed t-stat. I am trying to help a low income family with 4 children and I have already put to much time into this job any advice would be a big help.

the motor may have too much play as indication of worn bearings,
and besides, the capacitor may be bad, the cause for not startng up, oil.

When the t'stat starts the furnace, 1st the draft inducer motor runs for a few seconds, then the igniter glows and the gas valve opens.
The burner then lights, the igniter shuts off. If the burner shuts off when the igniter shuts off, then it's the flame sensor. 1st disconnect the power, remove the flame sensor and clean it with some 000 steel wool or scotch brite and reinstall it. 95% of the time that will fix it, otherwise you will need to replace the flame sensor.

Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

Do you have the model number? There is a problem with either the blower motor sensor or the ignitor. When the furnace get a signal for heat, the blower motor comes on and then the ignitor. If either one of those fail then it stops, waits and tries again. When the tech was there, if he did not replace any parts then he did not do his job. You can call them back out because the issue was not resolved or you can post the model number for us.

Check your furnace door. Sometimes there is a legend to how many blinking lights means what. I had an issue with mine, read the code and it turns out it was hitting the high heat limit. Turns out my blower motor wasn't turning on. Replaced it with a spare and it was fixed. Find out what type of furnace, and google the name, model, and the words, 3 blinking lights. Does your furnace turn on at all? Does it start to go through the cycle then stop? This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

Check your furnace by the electrical panel, there should be a blinking error light. Sometimes there is a legend to how many blinking lights means what. I had an issue with mine, read the code and it turns out it was hitting the high heat limit. Turns out my blower motor wasn't turning on. Replaced it with a spare and it was fixed. Find out what type of furnace, and google the name, model, and the words, 3 blinking lights. Does your furnace turn on at all? Does it start to go through the cycle then stop? This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

NO BECAUSE THE BOARD IS TELLING THE FANS TO STARTARE THE CONTACTS FUSED TOGETHER OR STUCK IN THE CLOSED POSISTION CHECK THIS FIRST

the first blower you hear is the inducer motor it pushes the exhaust out. sounds like abad gas valve.do you have a standing piloit light or is it eletronic ignition. if electronic and there is no glow you have a bad ignitor