Duomatic Olsen Ultramax (1985) problem

______________________________________________________________________ I have a Duomatic Olsen Ultramax (1985) which has an intermittent problem. The furnace ceases to operate and the house temperature drops well below set point (typically at night). When I detect the fault I find the exhaust fan running but the gas and the recirculation fan are obviously off. The reset switch on the side of the furnace has not “activated” but I can restart the furnace immediately by switching the power off and back on. Replies: aly “Re(2):Duomatic Olsen Ultramax (1985) problem” , posted Fri 14 Mar 12:04 ______________________________________________________________________ Have a furnace by same manufacturer and same age, check to see if it has a vent safety switch. This is usually located on the panel directly above the gas valve. My model has one wire leading from the gas valve up to the switch. The second wire leads to the wiring junction box located on the left on the inside of the furnace. You can reset the switch by pushing inward. CAUTION: if this is the problem you will need to check for obstructions in the venting system. It might be a warning that you have an obstruction ( birds nest) in your vent. This switch is activated when there is excessive exhaust gas build up. Hope this solves the problem. aly aly “Re(2):Duomatic Olsen Ultramax (1985) problem” , posted Fri 14 Mar 11:50 ______________________________________________________________________ aly xenos Webmaster “Re(2):Duomatic Olsen Ultramax (1985) problem” , posted Tue 13 Jan 17:29 ______________________________________________________________________ The most common reason would be a dirty flame sensor. Clean / sand it. Xenos. The best way to escape a problem is to solve it. Pictonian “Re(3):Duomatic Olsen Ultramax (1985) problem” , posted Wed 14 Jan 13:38 ______________________________________________________________________ The exact same thing happened to us last night: Olsen Ultramax came “on” (exhaust fan going) but wouldn’t “ignite,” and the house got quite cold (and it was a very cold night). I turned it off and on again, and it started up properly and now it’s working fine. But it’s a scary thing. Where is the flame censor, and how easy is it to do this kind of thing myself? I don’t mind paying my local heating guy for this … … and why does this kind of thing wait to happen until we’re tucked up in our beds? Come visit Prince Edward County! xenos Webmaster “Re(4):Duomatic Olsen Ultramax (1985) problem” , posted Wed 14 Jan 19:12 ______________________________________________________________________ The flame sensor is normally a 3 inch rod located on the last burner from the igniter and steel wool or sand paper works great cleaning it. However if youre the type that may be uncomfortable doing it your self by all means use a contractor. At the same time he may see something that may pay for his service call. A professional is always the best its just some of us DIYs love the challenge. Xenos. The best way to escape a problem is to solve it. martinw “Re(5):Duomatic Olsen Ultramax (1985) problem” , posted Sun 18 Jan 09:50 ______________________________________________________________________ Have cleaned thermocouple, problem persists. Noticed that “pilot flame” is not in full contact with thermocouple, suspect the temperature sensed is marginal and may be the cause of intermittent flame out. Any idea on the temperature commonly required for full gas flow? xenos Webmaster “Re(6):Duomatic Olsen Ultramax (1985) problem” , posted Sun 18 Jan 10:07 ______________________________________________________________________ Sorry no flame sensor. Ok I would recommend replacing the thermocouple as they dont last all that long and become week they are actually considered a maintenance item. I dont know about temperature however if you remove the thermocouple from the gas valve it should be producing over 25mv. Xenos. The best way to escape a problem is to solve it. martinw “Re(7):Duomatic Olsen Ultramax (1985) problem” , posted Tue 27 Jan 19:36 ______________________________________________________________________ Trying to locate new flame sensor. For the moment bent the end of the rod to give positive pilot flame contact, end is dark cherry. Haven’t had a trip for over a week!! Any idea on sensor model number and supplier in Toronto region? blmccar “Re(8):Duomatic Olsen Ultramax (1985) problem” , posted Thu 12 Feb 08:50 ______________________________________________________________________ Hello: Ran across this board because we had the same problem last night with our 1985 Duomatic Olsen Ultramax. We will have a technician stopping by. We have not touched it yet (and it has not “kicked in” yet) so that should help them find the problem. Will post what they determine. We are in North Dakota (USA) and were wondering where we would call if we need parts. A number of a dealer would be nice. Thanks! Brent Blmccar@msn.com Brent swamper40 “Re(9):Duomatic Olsen Ultramax (1985) problem” , posted Mon 9 Jan 21:49 ______________________________________________________________________ 1-9-06,well thank you for the advice,mine did that about three times,i came home yesterday from the weekend and my house was cold,i called right away,and the furnace guy told me that furnace was no good cause of the heat exchanger,so they came this morning,hook up a guage to check the vacuum which was ok,i told him i thought it was the intermitten box was bad,well he convinced me on a new furnace a quoted me a price on a heil for 2700.00,well he left so i decide to call another for a 2nd opinion,well he came and squirted oil in some hose which connects to a vacuum something?,well when he left it was working fine -for awhile.Darn if it didn’t do it again,just the way someone wrote above.I turned it off,waited a minute,turned it back on,an its been working since,Thank you for the advice…

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