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Old 12-06-2011, 09:18 PM   #16
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Furnace not lighting consistently


Yeah, the flame looked pretty strong, nice and blue and easily visible a couple inches it seems (however, I have nothing to compare it against and again I am a newbie). It just cut out relatively quick. The spark sounds very loud, I can hear it easily from upstairs.

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Old 12-06-2011, 09:28 PM   #17
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Furnace not lighting consistently


normally it should continue to spark for 30-60 seconds with a dirty rod/sensor until the S86 control "locks out". sounds like the gas valve or S86 may be failing. reread my previous post. I crunched some numbers for U. I can let you know what a reasonable entry level furnace is so a salesperson does not upsell you.
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Old 12-06-2011, 09:40 PM   #18
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Furnace not lighting consistently


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normally it should continue to spark for 30-60 seconds with a dirty rod/sensor until the S86 control "locks out". sounds like the gas valve or S86 may be failing. reread my previous post. I crunched some numbers for U. I can let you know what a reasonable entry level furnace is so a salesperson does not upsell you.
Hey Yuri,

Yeah, I am an MBA so I can handle the financial comparison and PV side, however I can't find much data on what furnaces actually cost. I'd like to avoid that if possible since we already are getting new insulation, probably a new hot water heater, etc.

What do you think for what is a 1000 sqft bungalow with a 200sqft addition on the main floor, furnace needs at least 92% afue for the gov't rebates (and the dc variable brushless fan if that isn't to expensive).
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Old 12-06-2011, 09:47 PM   #19
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Furnace not lighting consistently


you have a 105 = 105,000 BTU input unit now. I would be comfortable putting a 70,000 BTU 95% efficient unit in your house as you are going to add insulation etc. Costs vary but once you start getting into the ecm dc motors you are looking at over $5000 but the rebate is much better. $6000-6500 will get you the top end unit from Lennox, Carrier etc and a reasonable 2 stage with ecm motor $5000-5500 ish. Wpg prices are probably reasonable close to Edmonton. high eff furnaces are not an easy 4 hr slam bang install so you may want to beat the cold weather and huge surcharges if it goes at Xmas. they have to drill 2) 2 inch holes in your wall for the venting and that is not something you want to do when it gets real nasty outside. get some local prices are CAREFULLY check the BBB for complaints. you really do get what you pay for when it comes to furnace pricing. pay more get a quieter better quality unit.
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Old 12-06-2011, 09:53 PM   #20
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Furnace not lighting consistently


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Originally Posted by yuri View Post
you have a 105 = 105,000 BTU input unit now. I would be comfortable putting a 70,000 BTU 95% efficient unit in your house as you are going to add insulation etc. Costs vary but once you start getting into the ecm dc motors you are looking at over $5000 but the rebate is much better. $6000-6500 will get you the top end unit from Lennox, Carrier etc and a reasonable 2 stage with ecm motor $5000-5500 ish. Wpg prices are probably reasonable close to Edmonton. high eff furnaces are not an easy 4 hr slam bang install so you may want to beat the cold weather and huge surcharges if it goes at Xmas. they have to drill 2) 2 inch holes in your wall for the venting and that is not something you want to do when it gets real nasty outside. get some local prices are CAREFULLY check the BBB for complaints. you really do get what you pay for when it comes to furnace pricing. pay more get a quieter better quality unit.
What do you think is the absolute cheapest for a quality furnace that is 92% afue? I heard from other people significantly lower numbers... We can't afford that much.
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Old 12-07-2011, 02:33 AM   #21
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Furnace not lighting consistently


I just had the thing opened up, and I observed it. Five times in a row the pilot flame came on, a couple seconds later the spark lit all four burners. Then, each time after somewhere between 2 to 8 seconds, all the gas lines shut off ( even though they were running fine, and the pilot came back on again shortly after). I also noticed that the pilot flame stayed on for the few seconds that the main burners stayed on.

Does this indicate anything more than what I have already explained?
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Old 12-07-2011, 06:21 AM   #22
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Furnace not lighting consistently


probably needs a new pilot burner assbly. the rod can be cleaned but the whole pilot assbly gets rusty with age and is not properly cleanable. gets corroded and warped. Ducane and Rheem or Ruud makes a reasonable entry level unit IMO. not sure of the cost.
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Last edited by yuri; 12-07-2011 at 06:23 AM.
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Old 12-09-2011, 05:00 PM   #23
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Furnace not lighting consistently


I think I am going to get the $80 dollar service guy to check it out. If he determines that there is a faulty S8610U unit, they are available online from $85 to $129, I can install it myself by photographing current cabling and following accompanying instructions. I am related to a family that owns an energy efficiency company so I can get a good deal on a furnace, but I don't think it will be necessary.

Still hoping for a dirty flame sensor. We'll see when I get the proper tools to get it out or have the guy do it.
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Old 01-29-2012, 06:56 PM   #24
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Furnace not lighting consistently


Hey guys,

It was just a dirty flame sensor. Lucky, because two weeks ago it got to -46C (-50.8F) with wind chill. Ho ho ho... Too bad the service man charged me $200 to fix it. Next time I will do it myself, even though the furnace is part retrofitted and you actually have to take off part of the pilot system to get at the sensor.
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Old 01-29-2012, 07:00 PM   #25
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Furnace not lighting consistently


be glad, I'd of charged you twice that much.

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