Inverter Fault

[trekdave42]

When plugged into shore power I keep getting a fault. Green AC in light blinks once a second and the red fault light blinks 3 times. I've checked in the owners manual for the magnum inverter and it seems like this is an over heating fault. When I open the electrical bay it doesn't seem that hot and even keeping the bay door open doesn't solve the fault. Any suggestions?

David
2011 Berkshire 390BH

[JTN8]

This happen to me the other day. When my wife plugged the coach in, it didn't seat all the way and turned the power of and on several times until it seated all the way. When I went in I had a fault. I unplugged the coach for a minute the plugged back in (correctly!) and fault was cleared and all works well.... Not sure if this helps but unplugging and resetting is always a first step.

Jason

[trekdave42]

@JTN8: Thanks for the quick reply! I tried this a few times at the last campground I was at with no luck. Also broke out the voltmeter and was receiving 120V on each leg.

-David

[Happy Vibe]

Is the fan running? If the fan has gone bad you could get overheating.

[trekdave42]

@Happy_Vibe: The small fan (what looks like a small 12v computer fan) in the top left of the compartment was not running when I opened the bay door. Although the temperature outside is around 35 degrees at the moment.

-David

[Happy Vibe]

I would think the fan should be on if it is getting hot enough to show an error. I would say you have a bad fan or a bad circuit board. It's hard to trouble shoot from this far away.

[rana]

I've had that error code as well. Which magnum do you have? If a reset isn't working did you check your battery sensor connection?

Really low tech, but you might take a pencil eraser to your remote monitor connections as well, if you have one.

[Lloydg]

Originally Posted by trekdave42

@Happy_Vibe: The small fan (what looks like a small 12v computer fan) in the top left of the compartment was not running when I opened the bay door. Although the temperature outside is around 35 degrees at the moment. -David

Perhaps if the fan quit working a fault is automatically created regardless of the temperature? Did you notice at times before the fault occurred that the fan was on at times and off at others. If so, I'm full of bologna, but if it always has been on before, then maybe my suggestion is valid. Just a thought.

[beipers]

For the Magnum inverter in my Berk, there are 2 fans. One is internal to the inverter and controlled by it directly. The other is the exhaust fan on the compartment. That fan is controlled by a heat sensor that is attached externally to the inverter on the end mounting plate. It is added by FR to help keep the compartment cool based on the inverter temp. Are both fans functioning? I would submit that if the compartment fan is running in 35 degree temperatures, the unit is overheating due to an internal fan problem and the unit is much hotter than the surrounding compartment temp. I don't see my compartment fan run unless the temp is above 80.

I'd suggest you call Magnum. They've been good to work with when my unit failed last year.

[trekdave42]

Thanks everyone for the responses. I noticed that when the fault is on the fan mounted to the inside of my electrical bay was not on. Removed the fan and when I tested it found that it was bad. Hopefully once the replacement fan is installed the problem will go away.

[trekdave42]

Update: replaced the broken fan on the inside of the bay wall and still getting the fault. Have a few ideas what may be wrong: 1.) temperature sensor or 2.) if there is an internal fan on inverter that could be broken. Any ideas? Thanks!

-David

[cudntherd]

I recently had the same fault issue. Also had no power to front or rear TV, wall outlet in the bedroom was dead. Checked and reset the breaker under the bed, and solved the problem.

[trekdave42]

Cudntherd,

Thanks for the info. I by passed the temperature switch and also temporarily rigged up a fan to the side of the inventor to blow air across the top. Ran TVs, lights and heat pump all night with no issues. Looks like the internal fan is broken. Will update once I dig more into the manual.

[rattleNsmoke]

Is there a reputable replacement for 'Magnum' brand? Perhaps someone will chime in. Those units aren't cheap.

http://rvpowerpartsplus.net/index.ph...FVIV7AodoRQAiQ

[dan-nickie]

Originally Posted by trekdave42

Cudntherd,

Thanks for the info. I by passed the temperature switch and also temporarily rigged up a fan to the side of the inventor to blow air across the top. Ran TVs, lights and heat pump all night with no issues. Looks like the internal fan is broken. Will update once I dig more into the manual.

Sounds like you're hot on the trail :-)