Goodman furnace advice

[SIDECAR BOB]

any heating cooling guys
have a Goodman gmvc95 showing an error code e3, open high limit switch. no heat, no attempt to light, blower runs constantly as soon as power on. No blockages in ducting. I did notice the induction motor starts and runs for about 15 seconds then quits instead of going into low speed mode. I did replace the limit switch with no change. Suggestions or thoughts that it could be induction motor failed on low speed or what else to look at.

 

[Jim greengo]

Did you check all of the limit switches?

 

[Showkey]

Check the tubes or hoses for cracks, splits or tears.

 

[SIDECAR BOB]

all hoses good connections clean and tight , replaced the high limit switch
what concerns me or makes me question induction motor is supposedd to be 2 speed when power up supposed to run on high 15 secondds then go to low speed, however it shuts off after about 15 second no low. thinking the induction motor may have gone bad on the low speed side

 

[Done That]

Did you check all of the limit switches?

Agree.

I think this unit has manual reset flame rollout switch(es), but you need to know why they tripped if they did.

The usual, a dirty filter causing low airflow over the heat exchanger can be a culprit.

 

[SIDECAR BOB]

thqnkw for the ideas, it was a manual rest switch , filter are good , but we did have a power failure and surge the day it tripped , hasnt tripped since the one rest so keeping a eye on it and go from there thanks again to all