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Old 12-29-2016, 06:07 PM   #1
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Join Date: Oct 2014
Location: State College
Posts: 11
Furnace/AC issue

I have a Seismic 3914. Went camping this weekend and the furnace would not ignite or blow air. Had propane to the hot water and stove. Reset on/off switch on the furnace itself and furnace worked fine. Later that evening went to start the furnace up and it only blew cool air and would not ignite. Reset the switch but didn't do anything but blow cool air.

Then a little later went to see if the A/C would work. Was working fine until the wife touch the arrow up for the temp setting. The unit shut down and immediately started back up. Left it alone after that.

Between these two problems could it be the thermostat panel causing these issues? Thanks for any help.

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Old 12-29-2016, 06:38 PM   #2
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Join Date: Nov 2015
Location: Phoenix, AZ (2008 Seneca 35GS Diesel)
Posts: 986
Very likely, hopefully, just one or two loose control wires on the back of the thermostat.
A screwdriver and 5 minutes is all that should be needed.

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Old 12-29-2016, 08:19 PM   #3
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Join Date: Oct 2015
Location: La Crescenta
Posts: 191
I've had thermostat issues on my 2016 Greyhawk. My thermostat would lose the temperature setting I set whenever the furnace would try to ignite, it would always reset to the factory default temperature.

I *finally* figured it out and fixed it. The thermostat power was wired to the power wire feeding the furnace. When the furnace would light, the power would drop from 13V to 11V (or lower) and the thermostat would lose my setting and reset. I rewired the thermostat to another power feed (in my case, the power awning) and the problem went away.

The wire size Jayco decided to use to the furnace is a dedicated 14 gauge wire - bare minimum. I'm going to run a new 10 gauge wire from the furnace to the fuse panel, still using the 15 amp fuse to reduce the voltage drop.

Even plugged in to 120v shore power, 11 volts to the furnace is borderline for proper operation due to the sail switch reading air volume.

Hope this helps,

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Old 12-30-2016, 05:44 PM   #4
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Location: State College
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Thanks, I will take a look at it.
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