Only Vent motor runs

I have a Frasier PBNU-LD10N060D that is used just to heat the basement. I use it only about a dozen days a year. The venter motor went out so I replaced it. Everything worked for a few days. Then I started having problems again. The venter motor comes on, the ignitor glowed for a few seconds, the burner came on for just a couple of seconds, then everything shut down. This cycle repeated every minute. I decided to replace the control box. Now the venter comes on but just keeps running and nothing else happens. The ignitor does not glow. I checked my outside intake and exhaust pipes and there feels like there is plenty of air movement. I can't believe it's the control box but I don't know. Any suggestions?

 

Welcome to the forums.

Did you reconnect the tube from the venter to the pressure switch ?
Have you confirmed with a meter that the pressure switch closes when the venter starts ?
Did your old board have a blinking LED on it ?

Can't find any info on your York/Luxaire/Frasier/Johnson furnace.

 

Most times when the flame comes on for a split second then shuts off, it's the flame sensor. You didn't toss away your old control did you? I would put that one back on, clean the sensor and retest.

 

Thanks for the replies.

The flame does not come on at all. I did clean the sensor anyway.

The old controller had a solid red LED stay on. That's why I thought it was bad. The new contoller does not have the LED come on at all.

I did reconnect all the hoses to the venter. The pressure switch does not close when the venter comes on. I took the hose off and sucked into it, I hear a click and after about a minute the igniter comes on but not the burner. What does this mean?

Thanks again.

 

That means your fan is probably not doing what it's supposed to do. Did you put back an exact Manufacturer replacement part or did you use a universal motor? Inducer motors are not recommended to be replaced with anything other than the manufacturer's replacement part.

 

I did use the exact manufacturer's replacement motor. This furnace is just used for the basement. I have another Frasier furnace like this only bigger for the upstairs. About all the parts are identical between the two furnaces. I put the upstairs furnace venter in the basement furnace. There were no changes in doing this. So I think the replacement venter is good.

 

So you used the fan motor from a larger furnace on the one downstairs?

 

yes, they are identical. And with the same results.

 

So the fan is not closing the pressure switch?

 

If the red LED is not on..... the board is not receiving 24vac.

 

The fan is not closing the pressure switch.
I thought if the LED was always on then the contoller was bad. Is the transformer bad?

 

I think I'm getting somewhere. But I'm not sure what to do. I noticed that the LED on the controller for the main furnace blinks once at the beginning of a cycle. Then it stays off for the whole cycle. The LED on the basement controller never comes on. There's a test connector with 9 pins on it. Three of the pins, according to the attached schematic say they should be 24V. The other six pins should be 115V. Only pins 1 and 7 are 24V when the furnace comes on. And pins 6 and 9 arte 115V. All other pins are zero volts. Does this point to the transformer?

 

If you are finding 24vac on the board then the transformer is good. I can't help you much after that since I can't see the schematic (too small) and could not find an online manual for your unit.

 

I could email you the schematic so you could see it better.

Thanks for your help.