Carrier Furnace Flame Rollout Keeps Tripping - Why? - HVAC - DIY Chatroom Home Improvement Forum


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Old 10-08-2011, 09:04 AM   #1
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Carrier furnace flame rollout keeps tripping - why?


Carrier Furnace model 58MVP080
flame rollout on side keeps tripping. Replaced filter, opened all vents, returns not blocked, checked combustion air intake and exhaust and they are not blocked. Inspected burner nozzles and they look good( they are only 3 yrs old from when furnace was converted to propane)
Only thing I can see is that there is a bit of residual flame around the ends of the tubes that feed the heat exchanger. (the jet of flame does not completely shoot into the heat exchanger)
The box containing the propane nozzles and flame tubes and the rollout switch gets very hot to touch - is this normal?
Also, The 2-speed large blower never switches into high speed like it used to.
Are these things related and if so which is causing which?
Since this is at the cottage and hard to get contractors would love to get this fixed quickly myself.

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Old 10-08-2011, 09:25 AM   #2
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Carrier furnace flame rollout keeps tripping - why?


need to have the heat exchanger checked by a pro, sounds partially blocked or possibly even cracked.

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Old 10-08-2011, 10:07 AM   #3
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Carrier furnace flame rollout keeps tripping - why?


Thank you hvactech126
Is this normal in a 11 year old furnace even though it ran normally all season last year? Is there anything else I can check to be sure before calling for a very expensive repair/replacement?
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Old 10-08-2011, 10:12 AM   #4
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Carrier furnace flame rollout keeps tripping - why?


Heat exchanger could be bad. or if it wasn't set up right when converted to propane, the heat exchanger could be clogged with soot.
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Old 10-08-2011, 10:17 AM   #5
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Carrier furnace flame rollout keeps tripping - why?


As beenthere and I both suggested it may be partially clogged with soot. Not something you can really yourself. Most likely if it is a sooting issue then the secondary passages are blocked. This would be due to improper setup/ combustion. You didn't run your propane rank empty while your furnace was running did you? Under normal circumstances it would not matter but if the installing contractor did not install a low gas pressure switch then this might have sooted the heat exchanger.
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Old 10-08-2011, 10:31 AM   #6
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Carrier furnace flame rollout keeps tripping - why?


It has never run empty to my knowledge but since it is a cottage we are not up here most of the winter. The propane company comes very often thoughts evidenced by the frequent billing for a modern ultra-insulated building. Attached are photos of the tank regulators and inside of furnace in case you can see anything unusual. The contractor who installed this is pretty reputable but I guess you never know if you got a junior tech or something.
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Old 10-08-2011, 10:33 AM   #7
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Carrier furnace flame rollout keeps tripping - why?


They did install a low gas pressure switch.
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Old 10-08-2011, 10:35 AM   #8
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Carrier furnace flame rollout keeps tripping - why?


I should also add that I bought this furnace used three years ago(it is a 2000 model year) and the heat exchanger was checked by a heating contractor and it looked good in 2008 when I bought it.
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Old 10-08-2011, 10:54 AM   #9
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Carrier furnace flame rollout keeps tripping - why?


Used.....LOL!
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Old 10-08-2011, 11:15 AM   #10
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Carrier furnace flame rollout keeps tripping - why?


Was this furnace converted to use propane?
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Old 10-08-2011, 11:38 AM   #11
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Carrier furnace flame rollout keeps tripping - why?


Yes it was converted by a local contractor to use propane.
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Old 10-08-2011, 11:40 AM   #12
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Carrier furnace flame rollout keeps tripping - why?


It has run perfectly for 3 winters but when starting it up for this season I have encountered this problem.
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Old 10-08-2011, 11:45 AM   #13
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Carrier furnace flame rollout keeps tripping - why?


eye ball the flame right as the fan comes on see if you see a waving of that flame indicating possible heat x crack or holes.do you have colling there and if yes did you have condensation problems as if water dripped onto the heat ex in the summer
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Old 10-08-2011, 11:47 AM   #14
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Carrier furnace flame rollout keeps tripping - why?


So if the low pressure switch was installed, then would we not suspect soot partially clogging the heat exchanger and thus it must be a cracked heat exchanger? Could it be anything else?
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Old 10-08-2011, 11:50 AM   #15
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Carrier furnace flame rollout keeps tripping - why?


Thanks biggles. Will check flame when fan comes on. We do not have cooling installed so I don't suspect condensation.

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