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Old 08-13-2019, 08:34 PM   #1
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Join Date: Jul 2011
Location: Fort Myers, Fl
Posts: 5
Magnum Communication Error

We have a 2014 Suncruiser (Itasca) 38 q. My inverter flashes no communication error when traveling. The red and green light may be on, and it flashes all kinds of crazy things. It may tell me it is not communicating but the inverter may be working. It comes and goes. I'll turn it back on and it may work for a while. As soon as we come to a stand still, it will work. I have tried all of the resets and checked the cord and that does not solve the problem. It is apparent to me, there is a "short' or loose connection somewhere. Any ideas? It is a magnum inverter.


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Old 08-14-2019, 10:19 AM   #2
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Join Date: Aug 2018
Posts: 154
Hi Annie. I don't know about Magnum inverters, but I had numerous strange things happening with my Xantrex inverter. It uses a phone cord with those little square plugs on the end. The jack that those ends have little thin gold wires in them. What fixed my problems was gently pulling those wires up to give them more tension to contact the pads in the plug. I used a small crochet hook.
If your Magnum uses those phone cords, give it a try.

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Old 08-19-2019, 10:27 AM   #3
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Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 1,019
The Magnum remote (panel inside your RV) and the inverter communicate via what looks like a phone cable with RJ-11 jacks on both ends.

If a jack comes loose you'll get a "communication error". Of if there is a problem with the cable.

So, check both ends of those RJ-11 plugs and make sure they are properly seated. By the way, I"ve been told you can't just use a phone cord to replace those and that you have to contact Magnum to get the right cord. I don't know if it's true, that's just what I've been told.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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Old 08-20-2019, 12:35 AM   #4
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Join Date: Dec 2006
Location: Santa Clarita, CA.
Posts: 2,549
Ah.. Florida..

My Magnum recently went completely nuts. HV trips, randomly turning on and off, and a variety of other things (I have a list). I have a friend whose Magnum was doing the same things. Whats common? He lives near the beach, and I camp ON the beach a LOT!.. and you are the humidity capitol of the US (cept Houston).

Fix for me was to pull all the RJ-11 jacks, spray them with contact cleaner and exercise it several times. I did this with all the devices hooked to the Magnum and so-far its been good. My friends up in Oregon was the basic same issue nut he had to tear his apart and clean the ribbon cable on the control board.

Clear case of corrosion.

Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350
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