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07-06-2018, 09:23 AM
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#1
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Junior Member
Join Date: Jul 2018
Location: Indio
Posts: 3
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Propane alarm goes off when I turn on my AC
Hello everyone. Last night our Propane alarm kept going off everytime we turned on the AC. The alarm would sound for a couple of minutes then it would turn off. Before going to bed I turned off the propane on the main tanks in the front of the RV but I was afraid to turn the AC back on. In the morning I left the propane off and turned the AC on to see if it would sound off the alarm. All seems to work okay so far. The alarm hasn’t gone off yet but I haven’t turned on the propane yet.
Can anyone tell me why this happened? I want to be able to keep both the propane and AC on without the propane alarm going off. Thank you!
I have a Keystone Cougar light 33RBI
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07-06-2018, 10:04 AM
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#2
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Senior Member
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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Check your rv batteries! The LP/CO sensor is hardwired to the rv 12 volt system & will alarm if batteries are low. Why it happens with the AC is a mystery as far as I know they have nothing 12 volt in common except the thermostat.
__________________
Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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07-06-2018, 10:05 AM
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#3
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Junior Member
Join Date: Jun 2018
Location: Silverdale
Posts: 19
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We call it a "propane" detector but it will actually detect any flammable/explosive gas (butane-propellant for spray cans, hydrogen-charging battery, methane-cows/dogs/old men, even gasses from new carpet and glues can set it off) so it may not be propane that is setting it off. It could have simply been some other gas sitting stagnant in the AC ducting that was stirred up when the AC was turned on. There is no propane directly associated with the AC system or ducting.
__________________
2013 F150 Lariat Supercrew 3.5 Ecoboost 4x4
2017 Springdale 220BHWE
Retired US Navy Master Chief, Nuclear trained, Submarine qualified
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07-06-2018, 10:07 AM
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#4
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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Your profile doesn't include the year of your RV. Most LPG detectors have a limited lifespan of 5-7 years. After that, the detector isn't reliable and may not work properly and/or may "false alarm" when there is no propane near the detector. Additionally, the coating on the detector can be contaminated and rendered inoperable if exposed to some cleaning chemicals, natural gasses (think flatulence), dirt or other substances.
You might, depending on the age of your RV, be in need of a replacement LPG detector.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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07-06-2018, 10:40 AM
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#5
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Junior Member
Join Date: Jul 2018
Location: Indio
Posts: 3
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Quote:
Originally Posted by JRTJH
Your profile doesn't include the year of your RV. Most LPG detectors have a limited lifespan of 5-7 years. After that, the detector isn't reliable and may not work properly and/or may "false alarm" when there is no propane near the detector. Additionally, the coating on the detector can be contaminated and rendered inoperable if exposed to some cleaning chemicals, natural gasses (think flatulence), dirt or other substances.
You might, depending on the age of your RV, be in need of a replacement LPG detector.
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Thank you JR. It’s a 2016. I’ll add that to my profile.
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07-06-2018, 12:09 PM
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#6
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Senior Member
Join Date: May 2018
Location: Columbia
Posts: 128
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Unless you actually do have a small propane leak somewhere and the a.c. moving air flow got it to the sensor. Leak test may be the safest thing to do.
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07-06-2018, 01:26 PM
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#7
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Senior Member
Join Date: Aug 2017
Location: Rock Island
Posts: 457
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Sounds like the batteries were low and when the AC kicked on the converter stopped charging long enough for to the voltage to drop again.
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07-06-2018, 02:14 PM
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#8
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,695
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Have you smelled propane anywhere at any time? LP sinks and the AC could be picking it up and setting off the detector. I would think you could smell it but..... The 2nd year we had this trailer I kept smelling a faint odor of LP but could not pinpoint the problem, and did not smell it in the trailer unless igniting the stove, but it was there. Had a leak test performed and the regulator had a small leak so it was replaced.....right under/next to us in the bedroom....
__________________
Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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