Flame rollout switch trips after an hour...

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Old 12-13-19, 08:16 AM
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Flame rollout switch trips after an hour...

Morning

Heil propane furnace.

It works fine for an hour or so, then one of the two (upper one) Flame Rollout Senors trips. So I reset it, works for another hour or so, trips.

The sensor that kept tripping I replaced, keeps happening.

I do NOT see any evidence of flame rollout as in nothing is dark, burned, singed.
I watch the two flame jets and they seem to work perfectly fine.
As far as I can see inside I dont see any blockage.
There is a little black soot lying around on a metal bar underneath the ignitor.

In my ignorance Im thinking if it works for an hour or so there isn't a blockage? I didnt see any blockage?

Advice please?

Thanks in advance!
 
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Old 12-13-19, 06:18 PM
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Welcome to the forums.

More than likely the burner is overfiring and running too hot. I'd highly recommend calling a technician and have the propane supply pressure checked as well as the burner manifold pressure.

The other possible problem is a problem with the exhaust flue but that will usually cause the pressure switch to not prove OK.
 
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Old 12-13-19, 06:44 PM
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Thanks - an update:

Cleaned the cell burner assembly and replaced it. It now runs full time, without shutting off, ***IF I keep the door to the burner section off***

When I put the door back on, it turns off in a few minutes (rollout switch).

I then restart with the door off, runs and runs.

I used a borescope down the exhaust pipe and didnt see a blockage.
 
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Old 12-13-19, 07:32 PM
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I would agree the gas pressure needs to be checked.
I would also be inclined to do a combustion test on the unit to check how well it’s running.
 
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Old 12-13-19, 07:52 PM
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See if the flames change when the blower comes on.

Could be very subtle and only noticeable at the crossovers.

There can be combustion problems you can't see which can cause the rollout to trip.

Tripping rollout could be a bad heat exchanger but other things can cause it.

You should call a tech because the tool needed to check combustion is expensive and you can blow up your house messing with propane.
 
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Old 12-14-19, 05:35 AM
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Thanks for the advice. Since many of the solutions are expensive, I wanted to try all the DIY fixes first.
 
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Old 12-14-19, 08:12 AM
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DIY is fine, you just need the proper tools to do so.
Check gas pressure, and monitor the burner flame when the blower kicks on.
 
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Old 12-15-19, 04:32 PM
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The combustion analyzer which checks CO, O2, stack temp is like $1000.

The fuel pressure can be correct but can still have bad combustion/changes as the blower comes on.

In fairness i'm betting most techs don't carry analyzers.

May be able to get a CO only analyzer for less - i have no idea how much they cost.
 
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