78 Trillium 4500 heater not working - Fiberglass RV


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Old 12-23-2014, 07:42 PM   #1
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78 Trillium 4500 heater not working

Our Duo therm heater is not working. Can't get the pilot to light. Gas is working on stove. Does not seem like gas is coming out of heater. Any ideas?


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Old 12-23-2014, 07:51 PM   #2
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It takes awhile for the gas line to the furnace to bleed out the air.
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Old 12-23-2014, 07:55 PM   #3
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You mean the propane to the furnace? How long do I wait to light pilot?


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Old 12-24-2014, 10:15 AM   #4
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You stand the chance with blowing yourself up so I recommend that you get a trained professional to check it out. GAS is nothing to mess with.
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Old 12-24-2014, 07:22 PM   #5
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It's probably the thermocouple, a minor part. I hope the rest of the furnace is in good shape. Gravity furnaces are priceless assets for off-grid/boondocking in the winter.
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Old 12-25-2014, 07:33 AM   #6
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Undoubtedly, it's better to contact a specialist.
I have a trillium 4500 Jubilee 1980 and the last season I managed to start the pilot and as soon as I released the valve of safety, it went out.
I visited a specialist and he found the pipe of copper cut by the friction which occurred then travel.
A chance for us, it was the pipe between the safety valve and the furnace.
The specialist corrected the problem, made a check of the system, completed with a good cleaning.
During the ageing of the plumbing for the propane, the specialist told me, that with years, there is a slender film in pipe and that he is possible, in strength vibration during the travels, that these unstick from the wall of the pipe and find themselves in the tiny jets which feed the fire.
It's may be your problem!!?
Be careful and made beautiful rides with your family.
Do you have a gaz detector ?
Merry christmas to all,
Gilles.
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Old 12-25-2014, 09:30 AM   #7
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Is this a simple heater, or an actual furnace with blowers?


I do not know if you have had this Trilium for a while, or it is new to you. Some RVs have a shut off valve for the furnace. If this unit is newer to you follow the gas line along. If there is a shut off valve it is usually fairly near the furnace.
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Old 12-25-2014, 11:59 AM   #8
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It's a model similar like this : Coleman RV model 4312

http://www.thesamba.com/vw/archives/..._Operation.pdf

The shut off valve is in front of the furnace.

We are an owner of this caravan for 7 years.

Gilles.
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Old 12-25-2014, 04:00 PM   #9
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If the pilot lights when you have the red button held down it will take maybe thirty seconds of holding it down, while the pilot is lit, [usually doesn't take that long, but could] for the thermocouple to warm up enough for it to command the gas valve to stay open. If even after this the pilot goes out immediately, then it could be the thermocouple that is faulty.
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Old 12-26-2014, 07:42 AM   #10
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The best action to be taken at this moment, is to contact a specialist.
Return us with the answer of this one, please.
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Old 12-26-2014, 07:42 AM   #11
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Is it possible to purchase a new furnace for a travel trailer that is gravity fed and requires no fan? I'm looking around sites and don't seem to be able to find anything.
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Old 12-26-2014, 01:52 PM   #12
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You may need to purge the lp line, sometimes they air lock when you change tanks.
Also make sure your battery is fully charged.
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Old 12-26-2014, 07:53 PM   #13
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What does the battery have to do with the price of tea in China?
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Old 12-26-2014, 08:44 PM   #14
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Originally Posted by JRTrillium View Post
Is it possible to purchase a new furnace for a travel trailer that is gravity fed and requires no fan? I'm looking around sites and don't seem to be able to find anything.
There aren't any RV gravity furnaces available that I have -ever- heard of in recent history; the closest thing is a marine Dickinson P9000. Old RV gravity furnaces can be rebuilt with new gas valves, such as those by Robertshaw. The liability people will ensure that I now put in the phrase "by a trained and certified professional".

In the meantime check "or have checked" your thermocouple. They are cheap. Clean "or have cleaned" the junction where the thermocouple screws into the gas valve - it is an electrical device and the slight galvanic corrosion between the brass and aluminum can cause it to stop doing its job.
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