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Old 10-23-2020, 06:01 PM   #1
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Dometic Furnace heater

hello, I have a 2020 Passport with a Dometic heater i don't see a model on it. I have read a few posts about purging and sail switches not working, other issues as well. Well its day 1 of 4 day trip, and the wind and rain kicked up. We turned heater on. Ran to town and I ran out of propane, it shut off. When we go back, I turned on new tank, running the stove now to bleed, running the propane water heater to purge the line, it fires up. The water heater is heating, i can hear it outside. I'm thinking the furnace heater should be purged.

Question:
does the furnace system detect NO FLAME and shut down the propane?

should I keep finance on to purge air, or for 2 min, then off, on for 2 min and off. Non knowing how long it will run before detecting NO FLAME and shut down.

thx
jim
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Old 10-23-2020, 06:26 PM   #2
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Furnace just like water heater and fridge burner controls instantly detect 'no flame'
Each appliance circuit board will shutdown their respective gas valve....not the Main propane supply
Typically furnace will make 3x attempts to light/prove flame then 'lock out'
Reset by turning thermostat Off then back on for more attempts to fie up

After running out of propane or no propane usage for a while it can take SEVERAL attempts before flow/pressure is established at each appliance

Propane system is only 0.39psi (11"WC) ---you can whistle harder then that

Try again.....
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Old 10-23-2020, 06:43 PM   #3
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Furnace just like water heater and fridge burner controls instantly detect 'no flame'.
thanks, i have heat now. so it was my on, run for 2 min then off, on run for 2 min, then off cycles that purged it... not when i had let it run for 5 min or so... I figured there might be safety in the new furnaces .
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Old 10-23-2020, 10:17 PM   #4
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Originally Posted by jvbutter01 View Post
thanks, i have heat now. so it was my on, run for 2 min then off, on run for 2 min, then off cycles that purged it... not when i had let it run for 5 min or so... I figured there might be safety in the new furnaces .
Not just new ones.......
Flame detection safety features be they thermocouples or spark electrode via flame rectification has been used for decades
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Old 10-25-2020, 09:34 AM   #5
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Good information here. I've never had an issue even though I disconnect and remove my tanks each trip. But I do run the gas stove first thing when I hook back up, and then leave the refrigerator running 24 hours before leaving. Given their proximality to the furnace that probably clears the lines.

As an aside I've always thought it odd that the furnace is in such proximity to the refrigerator, but I guess for systems without a permanent full time gas supply that makes sense.
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Old 10-26-2020, 08:25 AM   #6
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As an aside I've always thought it odd that the furnace is in such proximity to the refrigerator, but I guess for systems without a permanent full time gas supply that makes sense.
It would be interesting for those who have rear kitchens share where there heaters are located? I dont think it would be a fridge / heater issue as much as what do you do with space under a fridge? make a heater box.
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Old 10-26-2020, 10:08 AM   #7
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It would be interesting for those who have rear kitchens share where there heaters are located? I dont think it would be a fridge / heater issue as much as what do you do with space under a fridge? make a heater box.
Yes, I also think it's a function of where to "build" a box for the furnace. Our current MH has the furnace under the refrigerator. Our previous MH had the refrigerator on a slide and the furnace was located on the opposite side of the coach, in a space under the kitchen cabinets, in close proximity to the stove top gas supply line.
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