Have HVAC Questions? Ask an HVAC Expert for Answers
hello,..do you mean the oil gun blower or the circulation blower?
Thank you....and when the blower comes on nothing else runs? Like the unit heat is locked out and the blower runs nonstop?
thank you...do you know what the "limit" is? Is there a chance the filter was plugged when this first started?
Air filter...if it were plugged we could have tripped the limit switch...
what model number Ducane do you have and I can direct you to it
with the top door off...you will see the oil burner gun...above that mounted on the front wall will be the limit switch
I do not show green....can you post a picture of the unit and I will circle it. And by chance do you have a meter?
yes...but the limit is not part of the board
there should be an attach file link...or a picture of a link....you can also use file share sites like tumblr, mediafire.com anf flickr..photobucket etc
directly to the left of the round inspection door in center...I can barely see an edge...can you show me the entire front?
left side flat plate..size of credit caerd..2 red wires....tap it first see if blower stops
remove those 2 red wires...inset a short wire into the ends to jump them together...or a small nail...just something that can metal of the wire touch the other wire...just a loop minus the switch for now.
with a voltmeter do you 24v at terminal R and C on the board?
On your unit there are very few things that can cause no heat with blower running..
Open limit switch, which we bypassed
Bad transformer..which is the square cube looking thing below the flat plate..this has 120v in and 24v out.
Do the 2 red wires from the flat plate both run to circuit board
do R and C have 24 volts?
thank you....and what about W to C? Then we can get you wrapped up
ok, now on the oil burner assembly...is there a T and T terminal with thermostat wire attached or a jumper on them?
On your circuit board...is there a yellow blade fuse, like what is found in a car?
And to recap...I know we did look at it....you did jump out the limit with 2 red wires on the flat plate?
And what circuit board model number is *****?
the only item in the schematic that can do this is the limit...if we have 24v at w and c...then the limit is the only item that can cause this....have you checked the red wires to where they plug into the board in the connector?...