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Old 11-10-2019, 08:21 AM   #1
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Furnace and Hot water tank won’t ignite

Woke up this morning and realized our furnace has not been working through the night. We have propane. I did a test and the hot water tank will not ignite either. It works fine on electric. I’m thinking pressure regulator. Any other ideas? We are stationary for work in western PA. I’m gonna need heat LOL.
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Old 11-10-2019, 08:34 AM   #2
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I would first try turning the gas bottles valves Off. Then slowly turn a gas bottle valve ON, they all have a built in leak detector valve on and if you turn them on too quickly the leak detector valve may operate and block the flow of gas.
I would test the gas flow with the burners on the stove and see if you can get one to light first. If you get a burner to light then let it run for a couple of minutes to get possible air out of the gas lines.
Turn off the furnace before you start any of this. The furnace will only try to light three times with the DSI, if it fails to light it will lock itself out and will not try to light again. Turning it Off will reset it and will try three more times.
Good luck.
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Old 11-10-2019, 08:34 AM   #3
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If the system was recently filled you probably have air in the lines. The auto ignition on furnace and heater usually doesn’t activate long enough to purge the lines.

Turn on and light all the cook stove burners. Then shut off and restart the water heater, then the furnace.
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Old 11-10-2019, 08:38 AM   #4
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Thank you I will give that a try.
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Old 11-10-2019, 08:40 AM   #5
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Use a meter (not the idiot lights on your panel) to test the charge level on your battery (use). Neither of these appliances will run with sufficient 12vDC charge.
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Old 11-10-2019, 09:02 AM   #6
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Showing 13.4v on my battery
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Old 11-10-2019, 09:02 AM   #7
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Does the stove light and burn correctly?
Will all the stove burners light and burn at the same time?
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Old 11-10-2019, 09:04 AM   #8
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Does the stove light and burn correctly?
Will all the stove burners light and burn at the same time?


Yes. And now my hot water tank will ignite but still nothing on the furnace
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Old 11-10-2019, 10:06 AM   #9
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Yes. And now my hot water tank will ignite but still nothing on the furnace
Just keep trying. If it doesn’t light with auto ignition after 3-4 attempts (auto), it shuts down and you have to remove the power and start over.
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Old 11-10-2019, 10:42 AM   #10
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Just keep trying. If it doesn’t light with auto ignition after 3-4 attempts (auto), it shuts down and you have to remove the power and start over.


I’m at a loss. Furnace just will not ignite
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Old 11-10-2019, 10:49 AM   #11
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I’m at a loss. Furnace just will not ignite
Can you hear the blower fan spinning?
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Old 11-10-2019, 10:57 AM   #12
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Your furnace is probably in lock out for failure to light. Turn off your thermostat then go to your electrical panel in the RV pull the 12 volt fuse for the furnace let it out for 30 seconds then put it back in. Turn on thermostat furnace should light.
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Old 11-10-2019, 11:03 AM   #13
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If you cant address this in the next few hours, keep in mind that an electric ceramic heater will go a long way keeping your living area warm. Unfortunately it wont help with your underbelly.

Good luck.
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Old 11-10-2019, 11:08 AM   #14
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We do have a space heater plus the fireplace. So we’re good for now. I just need to get this resolved before the cold front moves in next week.
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Old 11-10-2019, 11:08 AM   #15
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Can you hear the blower fan spinning?


Yes the fan will come on. The furnace will not ignite though
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Old 11-10-2019, 11:59 AM   #16
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As Rich said in post 12...definitely sounds like an air lock. Do the fuse thing. It could take two or three trys but it should work
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Old 11-10-2019, 12:27 PM   #17
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pressure regulator for propane may not set up proper for all you are trying to run off it.
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Old 11-10-2019, 12:32 PM   #18
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Yes the fan will come on. The furnace will not ignite though
Can you hear sparking/clicking near the furnace or outside furnace vent when you turn it on?

Tell us exactly what happens when you first turn the furnace on and how long it runs after it doesn't lite and then what you do to try it again.

These are important things to know when helping to diagnose furnace issues.
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Old 11-10-2019, 01:07 PM   #19
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pressure regulator for propane may not set up proper for all you are trying to run off it.


Has run the same set up for a year now.
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Old 11-10-2019, 01:08 PM   #20
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Can you hear sparking/clicking near the furnace or outside furnace vent when you turn it on?

Tell us exactly what happens when you first turn the furnace on and how long it runs after it doesn't lite and then what you do to try it again.

These are important things to know when helping to diagnose furnace issues.


Ok. I turn the furnace on. The blower kicks on and runs for approx 15-20 seconds then shuts off. No, the igniter doesn’t click nor can I hear the click of the gas valve opening.
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