Originally Posted by
GrumpyGuy37
Alrighty, cleared the pressure switch plugged the unit back in... Blowers on glowstick glowed and then fire ignited.. unit ran fine. I ran it for a few minutes and shut it down. Let the blowers completely shut off and tried to restart it. Blowers on...glow stick glowed.. then went out no gas no fire and back to 31 code. I unplugged the unit for about 30 seconds then restarted it. Blowers on...glow stick glowed.. gas ignited and we have fire and heat. Unit ran fine for about an hour then flame went out blower stayed on and light blinking again.SOOOOO now what, replace the circuit board? This is the mother in laws house and she is cold should I quit trying to save a buck and call a repairman? Seems to me unit is working fine just has the gas relay bug. As always advice is appreciated and respected. Thanks
I wish you would have told me it was your mother in laws house to start with. No matter if you do fix it she would still say it is not working like before. LOL
Jump the pressure switch electrical connections and see if it will cycle a few times without kicking a code. Also check the pressure switch rubber hose carefully for a small hole tear etc. If the unit runs OK with the switch jumper you have found the problem if not call for On site service before it becomes a memerable occasion and comes up every Thanksgiving. LOL
NOTE: Do not allow the furnace to operate with the connections jumpered unattended. This is for test purposes only and could create a dangerous condition if allowed to operate without you being there. (now that is a thought if you do not like your mother in law and are looking for a quick disposal).
I hate to see you buy a board if it is not necessary.
Note if this system has a flame sensor clean it up a bit with sand paper to possible prevent another problem down the road. Clean it carefully and stay away from the ignitor. They are very sensitive.