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Old 07-03-2015, 09:53 AM   #1
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'Low Air' warning alarm running constantly

We are rolling in my buddy's 2002 Monaco Diplomat, and we're having an issue with the 'low air' warning alarm running constantly. To give some of the back story, on start-up during pressurization, the alarm will sound from 30 psi to 80 psi, then it shuts off from 80 psi to 110 psi, then goes back on and stays on. We just started a five-hour road trip and we'd like to figure out fix it or at least shut it off for the trip.

Anyone have experience with a Monaco product, with this situation, or just an idea of how to shut it off?
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Old 07-03-2015, 11:13 AM   #2
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Just to clarify;
The tank gauges show normal pressure 110PSI and the alarm continues to go off ?
Does the alarm stay off as long as the coach is in neutral, then come on when the coach is put into gear , and the park brake is released.
The reason I ask is the park brake warning , uses a very similar sounding alarm. An sometimes the sensor for that alarm can go bad , but repeated application/release of the park brake can , shut it off.
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Old 07-03-2015, 11:19 AM   #3
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To clarify, the alarm is going off, and the 'Low Air' light on the dash is lit.

But, when we're parked, in gear or neutral, when we discharge air by tapping the brakes, the alarm AND the lit 'Low Air' warning lights goes off/out when the pressure drops below 70 psi and won't come back on until the pressure rebuilds to 100 psi.
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Old 07-03-2015, 11:26 AM   #4
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Thanks for the clarification.
I hope a Monaco owner/member comes forward soon with some ideas for you. If the buzzers are hidden anything like mine are , even accessing them to disconnect is a job for a double jointed dwarf.
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Old 07-03-2015, 11:30 AM   #5
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As long as the pressure is correct, I would suspect the sender for the parking brake is not functioning correctly. If this is fact the issue, many times it is, it is an easy fix, replace the switch. We had to replace the sender in our 2003 Endeavor when we still had it.
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Old 07-03-2015, 12:48 PM   #6
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I presume that even with the erratic buzzer and light, the actual air gauges continue to be stable, and the air system is working. Also, the low air buzzer is likely in the dash right behind the gauges. If you have an access panel, remove it and just disconnect the buzzer lead.

If your friend's Monaco has a Freightliner chassis, it could be a failed VDC. Common problem in that vintage. Mine went loopy-- light, buzzer, and gauge all erratic, but air system continued to work fine. Same unit may have been used by Spartan as well. I don't know.


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Old 07-03-2015, 03:53 PM   #7
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In the electric bay, left front, in the black box marked Monaco 1 are 2 fuses marked alarm 1 and alarm 2 remove them and no more alarm noise. But the sending unit for the air alarm needs to be replaced in case something goes wrong and you loose air. NOT A GOOD THING😠
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Old 07-03-2015, 08:56 PM   #8
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Could I ask, where is the sending unit? I have 2004 HR Ambassador with the same alarm problem.
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Old 07-03-2015, 10:12 PM   #9
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Most MH's have 2 sending units, one for rear, one for front air tank. The location of them is different between mfgrs. When you find them, switch them and see what happens. The other air gauge should read differently. The alarm is on the tank that supplies air for the braking system; that is my front tank gauge.
I remember that from a previous irv2.com thread on this subject.
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Old 07-03-2015, 11:49 PM   #10
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On my Imperial it was the sending unit on the front tank. I found it by unplugging the wire that goes to it. Alarm shut off. It could be the one on the back tank. If you find out that that is what it is it is easy to replace. Just make sure your coach is supported so that when you let the air out of the tank to change the sending unit it wont come down and crush you.
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Old 07-05-2015, 08:51 AM   #11
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Quote:
Originally Posted by mccrob View Post
In the electric bay, left front, in the black box marked Monaco 1 are 2 fuses marked alarm 1 and alarm 2 remove them and no more alarm noise. But the sending unit for the air alarm needs to be replaced in case something goes wrong and you loose air. NOT A GOOD THING😠
We don't have any fuses marked 'Alarm 1' or 'Alarm 2'.
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