Intellitec Multiplex Issues

[38 Special]

First, this problem is solved. I post to assist others.

I have a electric bed lift and been working great since installed a month ago. Yesterday, while raising the bed, we lost all power, or so I thought. We lost all house lights and all threee air conditioners. When I cycled power to the air conditioners, the middle unit ONLY came back on. No lights, no water pump, no fantastic fans. Nothing had power that went through the Intellitec Multiplexers.

So, I called Monaco. They suggested I cut power to the coach using the battery disconnect switches to "re-boot" the system. We did, but to no avail. The tech said it sounded like the board that controlled the mulitplexers was bad. I had been lucky to obtain a copy of the wiring diagrams on the coach from a member on this forum. I knew the part that was bad was called an "IPX Control". He said he could transfer me to parts.

As we were staying at LazyDays last night (and next 6 days), I called their parts dept, they found the board in stock at a dealer in California, it is now 4:30PM on Friday. No lights and only one AC. I said I would be there the next morning to order.

I had looked everywhere for this board without luck. The wiring diagram said: "Location: T-RM Overhead". After some thought, the DW said "Toilet Room". Ours is a bath and a half, so toilet room made since.

I took off the multiplexer panel, nothing. Took down the 110V power panel. As the power is now off, and 92 outside, it is getting hot quick. I find nothing. Back to the wiring diagrams for more clues. I am looking for two wires from the multipexers, I trace them and they go into the back of the 110V power panel.

So, I re-assemble things enough to hold it all together and remove the front off the 110V circuit breaker box. Found the board. It is in the void on the right side of the panel.

But, wait, there is a fuse on the board, the fuse is BLOWN, a small 5amp fuse. The Monaco tech never said anything about a fuse, only to replace the board.

Replaced the fuse, lights come on. Recycle the air conditioners and they come on also. We are fixed.

My guess on the air conditioners is the Intellitec panel defaulted to a 15amp input and "shedded" power to the other two air conditioners. I did not check the washer/dryer, but I am sure now they had no power either.

The reason for this long winded post is this is a hidden fuse, and one that darkens the entire coach. Hopefully, someone searching this board in the future will stumble across this, and realize what the simple repair is, and lower the hours of troubleshooting I went through.

This is a great board.