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Old 01-02-2016, 08:58 PM   #15
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Old 01-05-2016, 10:14 AM   #16
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Update.

The battery that showed 0.0 volts showed 3.2 volts yesterday. After charging overnight (6volt charger) it's back to 100%. I will check it again when I get home to see if it's maintained its charge.

I will reconnect everything this weekend to see if this was the cause of the magnum fault.
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Old 01-05-2016, 01:09 PM   #17
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The no Comm is coming from the battery voltage being too low and not allowing the Magnum invertor to communicate with the system.

If this happens, you would need to get voltage up. So if you start your engine and allow it to run it will charge the house battery to raise the voltage. So leaving the unit plugged in with engine running this will allowing the Magnum Invertor to work again.
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Old 03-12-2016, 08:35 PM   #18
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Magnum No Comm

Perhaps someone can help. On several occasions the Magnum shut off with the No Comm fault on the remote screen. I was able to clear the faults by shutting off all power with the shutoff. In the past I never turned off the Magnum inverter when I turned on the generator. Perhaps that caused the fault when the generator took over the A/C power. I use the invertor to run the TV. Now The past day I shut off the invertor before turning on the generator and so far have not had a fault. Any help would be appreciated.
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Old 03-12-2016, 08:45 PM   #19
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Perhaps someone can help. On several occasions the Magnum shut off with the No Comm fault on the remote screen. I was able to clear the faults by shutting off all power with the shutoff. In the past I never turned off the Magnum inverter when I turned on the generator. Perhaps that caused the fault when the generator took over the A/C power. I use the invertor to run the TV. Now The past day I shut off the invertor before turning on the generator and so far have not had a fault. Any help would be appreciated.
There is no internal relationship between having the inverter 'ON' and then applying shore power sourced either from the generator or the power post that should create a problem as you described. The Magnum has an internal transfer switch which will pass thru any shore power once detected and will cease to 'invert' the DC into 120VAC.

It is usually a bad idea to leave the inverter in the 'ON' position, as it will create it's own parasitic load on the batteries while it is 'searching' for a load. I always council my clients to leave the inverter 'OFF' until you want to create 120VAC from the batteries and then turn the inverter 'ON, then switch it OFF again when finished using the device.
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Old 03-13-2016, 08:39 AM   #20
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Thanks for help. Going through the check list further up this thread, I know it is not a loose cable since I checked it. It is sporadic thus it must be the inverter itself. I will have it checked out. Thanks again
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Old 03-20-2016, 01:20 PM   #21
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I am currently waiting for an appointment to get my Magnum invertor checked out for the problem described above. Unfortunately Airstream dealers are booked up over six weeks.

I know LEW indicated there is no relationship to the invertor and A/C from either the generator or being plugged in. However even when not using the invertor, sporadically the invertor will turn to Comm fault when I start the generator. Further when it does that my TV has no power. Somehow the TV must go through the invertor. I don't seem to have that problem when I have the unit plugged in. Can the quality of electricity from the generator be causing the fault? Don't understand why TV won't work when use generator, the invertor is not on invert, and all other A/C is functioning. Again it is sporadic and I am able to clear faults by rebooting power system. Any thoughts would be appreciated
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Old 03-20-2016, 02:46 PM   #22
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Magnum Fault! No Comm

Your TV circuit is connected to the 'pass-thru' circuit of the inverter. This allows you to watch TV ( and power whatever else is connected thru the inverter) when on battery alone, but will also energize those circuits when shore/ gen. power is available.

If you are repeatedly getting a fault, especially when starting the generator, the inverter low voltage disconnect is probably set too high.

The high transient draw from starting the generator is obviously causing s low voltage fault in the Magnum.

I would also suspect the condition of your batteries, as they should not be drawn down so far when starting the gen. Both devices are wired to your house battery bank. You should have your batteries tested for capacity soon!


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Old 03-20-2016, 03:12 PM   #23
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LEW, thanks

I purchased unit new six months ago. I had it built and it sat on lot three weeks before I could pick it up. Suspicious of batteries then and had them replace them. Unit is always plugged in when not in use. Will have batteries checked again
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Old 03-20-2016, 05:07 PM   #24
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LEW, thanks

I purchased unit new six months ago. I had it built and it sat on lot three weeks before I could pick it up. Suspicious of batteries then and had them replace them. Unit is always plugged in when not in use. Will have batteries checked again
Your Magnum has a 2 year factory warranty. Any Magnum authorized service center can test it for you. I would venture a guess that most Airstream dealers (make that most RV dealers in general) have no clue about how to test a Magnum and considering it is still under warranty, you should have Magnum involved in the process, unless Airstream will cover it under their warranty and replace it!
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Old 04-28-2016, 03:04 PM   #25
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A quick follow up. My unit was at the dealer for three weeks trying to diagnose the magnum problem. They said they found it to be a bad solenoid. Mine was installed at the factory, others had a service bulletin upgrade. Took the coach home yesterday and the problem was worse. The Magnum was as dead as a door nail. When I put the generator on it said no communication Just left the coach at the dealer. A quick diagnoses indicated another bad solenoid. Dealer said he is not allowed to remove it But we agreed a new one won't be connected. I guess their service bulletins creates problems. Hopefully will get coach back next week and maybe it is fixed.
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Old 04-28-2016, 05:29 PM   #26
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Is this the solenoid added as a result of Service Bulletin 164?
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Old 04-28-2016, 08:33 PM   #27
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Yes same solenoid. This is second one that was defective. For some reason the factory in order to do the repair is insisting a new one be installed. The dealer agreed to install it but it will not be connected. I cannot understand why the factory was so insistent. It can't be a safety problem not having one.
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Old 04-28-2016, 08:47 PM   #28
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Yes same solenoid. This is second one that was defective. For some reason the factory in order to do the repair is insisting a new one be installed. The dealer agreed to install it but it will not be connected. I cannot understand why the factory was so insistent. It can't be a safety problem not having one.
It has nothing to do with safety! It has everything to do with Airstream trying to CYA for a charging system design that has some serious flaws.

As I have been told by some recent clients with new Grand Tours, the problem of extreme battery drain is a function of leaving the inverter in the 'ON' position when not in use. The Magnum will burn a parasitic load in excess of 1.5 amps while it is 'idling' and in stand-by mode. This does not happen if the inverter is switched 'OFF'.

I counsel all of my clients to consciously turn the inverter to 'ON' when in use and 'OFF when that use is finished. It's just like turning a light bulb on when entering a room and off upon exit. Of course, they really don't NEED to do this as most have greatly enhanced battery banks and 400 watts of solar that really work in keeping their batteries charged.

The solenoid is wired into the positive inverter DC line coming from the batteries. It is meant to solve the problem of inverter parasitic loads. A more simplistic fix would be to use a Blue Sea Systems Series M rotary switch positioned in the front panel of the electrical center (just like your motorized disconnect switch) and simply turn it off when not using the inverter or needing it's 120VAC pass-thru function.

I also do this in all of my installations to be ably to isolate the inverter if a hard re-set is required. Sure beats disconnecting battery cables!!!
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