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Old 09-25-2015, 05:27 PM   #1
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1985 34' Excella
Durham , North Carolina
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Furnace not relighting after switching propane tanks

We live (full-time) in our 1985 34' Excella. Our furnace worked great last night, but by morning it was blowing cold air. Sure enough the tank was empty, so I switched tanks. Water heater and furnace didn't relight. I adjusted water heater igniter till it lit, but when I checked igniter in the furnace, it doesn't seem that gas is getting to the chamber... Stove and water heater working fine. Help please. Thanks!
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Old 09-25-2015, 05:33 PM   #2
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Try the ignition sequence at least four or five more times.

Sometimes it takes a bit of patience to clear the lines of contaminated gas.

Please report back how you resolved the problem.
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Old 09-25-2015, 06:20 PM   #3
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It seems like its hardest to get the air out of the furnace lines...

Keep trying.
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Old 09-25-2015, 08:14 PM   #4
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Ok. Will do. Thanks!
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Old 09-25-2015, 08:33 PM   #5
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This has happened to mine. Eventually it re-lit.
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Old 09-25-2015, 08:37 PM   #6
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Light a stove eye for a bit to purge the lines.
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Old 09-25-2015, 09:27 PM   #7
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1985 34' Excella
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I did try the stove thing earlier, but not for several starting cycles. Sadly, six cycles did not do the trick tonight. I'll try with the stove tomorrow. Thankfully a Broan Big Heat (but very tiny) space heater is cranking away in lieu of the furnace, although I'm guessing propane is cheaper than kWh, which matters because it's our utility bill.
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Old 09-26-2015, 02:36 PM   #8
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Make sure you have gas,turn on the valve, turn gas on stove until it lights.....works every time to fill the empty gas lines....
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Old 09-26-2015, 04:03 PM   #9
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If your tanks/system are relatively new they are probably equipped with an Overfill Protection Device and other safety devices. The excess flow valve part of this system (tank and regulator) can automatically prevent the flow of propane from the tank to your lines if it detects a sudden increase in gas flow. The idea is that it would prevent the flow of gas if one of your copper lines tore off the bottom of your trailer for example. The valve can accidentally trigger if you switch out propane tanks and open the valve on the new tank too quickly. This simulates the sudden propane demand that the safety feature was designed to address. If you just hook up and throw the valve wide open (like I used to on our BBQ grill) you are likely to encounter this problem every time you change tanks or close the valve for storage, etc.

I would close off the valve at the tank, light the stove for a minute to clear the propane and air out of the lines, then very slowly open up the valve on the propane tank. If you do nothing at all the situation should resolve itself once the pressure equalizes.

I'm not sure if that is your issue but something to consider...
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Old 09-26-2015, 04:12 PM   #10
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In my 1985 25' AS, the furnace circuit board gave up the ghost, and I had to replace it. Is your furnace original?
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Old 09-26-2015, 05:28 PM   #11
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Furnace not ignighting

Be sure that the tank selector on the pressure regulator has been turned to the active tank. If you have access to a manometer, check the gas pressure at the furnace. Should be between 13-15 psi. If not, adjust the tank regulator to meet this standard. Also, you may need to replace the overheat cutoff safety switch. Easy to do and not expensive.
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Old 09-26-2015, 06:41 PM   #12
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1985 34' Excella
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Tried lighting with stove lit. No go. I think it's probably original. Terrified of having to replace something, or replacing the whole thing, because of having to possibly open up the floor to get to everything to disconnect and reconnect. Will keep trying the startup cycle with stove lit.
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Old 09-26-2015, 06:43 PM   #13
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As an aside, I don't know why the bathroom duct is very low pressure. Probably have to tear open the floor to get to duct junctions?
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Old 09-26-2015, 08:00 PM   #14
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1986 25' Sovereign
Huntsville , Alabama
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A few years ago the heater on my 86 would not light. First off If your batteries are not charged the sail switch will not close and let the gas valve open. Mine was okay and I replaced the circuit board and it solved the problem a time or two. Finally I figured out the gas solenoid was sticking closed. After disassembling and cleaning it my problem was solved. That has been a couple of years ago.
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