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Old 07-30-2014, 04:39 PM   #1
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90 1/2 Bounder Heater/Furnace Issue

We've owned this since new. And it seems to me that on occasion over the years, our furnace would not ignite. Not frequently, just every few or several years. I could have sworn that it was generally a piece that had to do with the ignitor. As I recall, this particular small piece included some form of sealed disc that relied on pressure or temperature to expand or contract to cause ignition.

Frankly, i might be confusing this part with an earlier travel trailer, but I don't think so. In any event I thought it was down behind a vent below the regrigerator, but I've gone there and found nothing.

Admittedly, I'm getting older and may be imagining all this. But the bottomline is that when we last took the rig out, the heater would not turn on at the wall switch/thermostat. Propane level was fine.

Any suggestions?
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Old 07-30-2014, 05:09 PM   #2
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Ed,

I think you might be thinking of a thermocouple. It has to be heated up by the pilot light or igniter and if successful it signals the gas valve to release the propane and ignite the furnace. These are fairly easy to replace and a very common problem with hot water heaters, furnances and such. Check with an RV repair place and they will probably have one in stock and can install for you quickly.

Good luck!
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Old 07-30-2014, 07:08 PM   #3
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Quote:
Originally Posted by jhlady View Post
Ed,

I think you might be thinking of a thermocouple. It has to be heated up by the pilot light or igniter and if successful it signals the gas valve to release the propane and ignite the furnace. These are fairly easy to replace and a very common problem with hot water heaters, furnances and such. Check with an RV repair place and they will probably have one in stock and can install for you quickly.

Good luck!
Thanks jhlady! I think you are right regarding the part. But I'm looking for its location within my particular rig, and I think you have me confused with someone who will take my motorhome to a dealer or repair facilility if I can do the job myself along with my forum friends.
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Old 07-30-2014, 07:25 PM   #4
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If you open the outside door to your furnace, the thermocouple will be located in the combustion chamber. First will be the 'horn' that allows air in, then the gas jet, ignitor, and the thermocouple. You should also check that the ignitor gap is the correct one, you'll find that information in your user's manual. When the furnace is turned on, if you are standing outside with the furnace door open you should hear the ignitor snapping. If you hear that but it won't light, that affirms it's probably the thermocouple.
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Old 07-30-2014, 08:21 PM   #5
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I suspect a 90 Bounder will have a DSI furnace which uses electric probes rather than a thermocouple. They have to be cleaned and adjusted periodically.
Thermocouples are used with pilot light style burners.

Dave
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Old 08-01-2014, 12:36 AM   #6
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hi I have a 90 Fleetwood 34 same thing pretty much it has a wire ignitor take all your grounds clean them good these are the same as a house furnace needs good ground for el sparko but take power off first be4 disassemble you can also take sand paper and clean the ign wire hope that helps also check your safety switches
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Old 08-01-2014, 12:44 AM   #7
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also are you referring too the flue pressure safety switch the one with tube on it ??????if so some times were the hose plugs in at flue side gets rust or debri in it take a piece of wire and poke thru and clean debri out hope that helps
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