Tuesday, October 3, 2023


Control board not working? Replace it!

By Russ and Tiña De Maris

Perhaps some of the most mysterious of RV technical issues surrounds electronically controlled appliances. “Back in the old days,” as some of us recall, we didn’t have fancy control boards on refrigerators, furnaces and water heaters. Of course, “back in the old days” a lot of us had to go outside in the cold or heat to light off those selfsame appliances.

Nowadays, the trouble is when things start getting “buggy” it can be difficult to track down the problem. One time, one of our 3-way refrigerators, which had been a straight-A student, suddenly went rebellious on us. Sitting on a hot parking lot just outside of Old Mexico our refrigerator stopped being a chill box and the threat of global warming parked itself right in the middle of our kitchen. Only by turning on the generator and resorting to “shore power” would we get any chill in the box. Gas didn’t light, and DC simply knocked all the low-voltage power out throughout the rig. We cut our time in the field short and headed back to base camp.

Dino to the rescue
In a safe harbor with another working fridge available we started down through the diagnostics process. The whole works pointed to a control board failure, or so it seemed. We contacted an RV refrigeration supplier who opined that it “sounded like” a board too, but he couldn’t really be sure without running tests on it. Too bad he was 1,500 miles away. So we called the horse’s mouth or, should we say, the Dinosaur’s mouth.


Yep, when campfire talk comes around to appliance control board problems the name probably mentioned most is Dinosaur. Built by a seemingly obscure company, Dinosaur boards are the leading word in replacement control boards. The Dino folks build replacement boards for just about every RV appliance (and generator) application there is. We called in and immediately tied into one of Dinosaur’s tech fellows. After an initial discussion of the problem the technician asked if we wouldn’t mind checking a couple of things “in situ,” right on the back of the refrigerator. The Dino-tech walked us through a series of tests with a digital multi-tester that verified our refrigerator control board was ready for the scrap pile.

To his credit, in addition to making a suggestion for a given Dinosaur board, the technician did suggest we could try an OEM replacement board. Maybe there was a bit of tongue-in-cheek here because the old “pudding covered” board out of the back of our ‘fridge was “out of production” from the reefer maker. That’s a common complaint among RVers: Many control boards aren’t “replaceable” with OEM boards. It’s a case of, “Well, we’d be happy to direct you to a dealer where you can by a new refrigerator, furnace, water heater,” etc.

Replacement boards do cost money, but it’s still a whale of a lot less expensive than replacing an otherwise “good” refrigerator. In our case the Dino-made after-market board is really superior to the OEM. We peeled back the old epoxy “pudding” that covered our dead board and discovered components that had actually come unsoldered from the old board. A circuit board is basically a plastic plate over which circuits between components are etched out of copper. Where components were soldered into our circuit board, the component itself resides on one side of the board and its electronic wire leads are pushed through the board and soldered onto “traces” on the underside. With heat and vibration the solder joints are subject to stress and often break. In Dino’s replacement boards the leads go through a hole in the board that is copper plated from front to back. As a result a much more skookum solder joint is possible.

Long story short, we bought a Dinosaur replacement board. It arrived soon, along with full instructions on how to replace the old board with the new. Let’s walk through it:

Putting in a new board
First the disclaimer: Dinosaur’s website plainly says that RV appliances use LP and recommends that trained technicians do replacement work. In fact Dinosaur will only sell to retailers, rather than to end-users. If you replace your own board make sure you understand the risks. If you hire the work done, don’t throw away Dinosaur’s phone number – their staff can still help you sort out problems that can save you money.

Since not all control boards are alike, we offer generalized tips for replacements. Be sure to follow the instructions that come with replacement boards to the letter if you decide to do your own work.

First, turn off the power! Unless the instructions say otherwise, having the “juice” off is just a smart safety issue. Turn off both shore power and disconnect the RV “house” battery. Remember: When working with electrical stuff, take off your jewelry.

If there’s any question about the wires coming off your existing control board, mark them. We had several of the same colored wires on our board, three of the same color right next to each other. Tagging them with tape is one option. Count the number of pins on your existing board and note the colors (or other identifying marks) of their associated wires.

If there’s enough room in the appliance compartment, detach each lead one at a time and put that lead in place on the new board before proceeding to the next. If not, here’s where the importance of identifying each wire comes into play. You’ll find it much easier to use needle-nose pliers to disconnect and reconnect terminal leads. After you’ve completed the job double-check your wiring connections before turning the power back on.

We were thoroughly gratified that within a couple of seconds of pushing the “power on” button, the popping sound of the gas burner lighting came to our ears. Sure enough, all it took was a new board and our reefer was back in business.

Getting help from Dinosaur
Dinosaur Electronics has both a full website and a telephone support staff. Before you call to ask for troubleshooting assistance or an application have this information ready:

1. The specific problem. Be as detailed as possible with a step-by-step rundown of what happens (or doesn’t happen) with your appliance.

2. The manufacturer and specific model number of the appliance. You may have to hunt around for this information for some appliances, but without it your help will be limited.

3. You may be asked for certain information to help troubleshoot. Having a cordless telephone or cell phone really helps. If you have a digital voltmeter make sure it’s at hand and have the cover off the appliance to facilitate getting at your control board.

Dinosaur Electronics can be reached by phone at 541-994-4344 8 a.m. – 5 p.m. Monday through Friday, Pacific time. They also maintain a web-based “customer help form,” where you can enter and e-mail technical help requests. All that information, and a great deal more is found at Dinosaur’s website.


Russ and Tiña De Maris
Russ and Tiña De Maris
Russ and Tiña went from childhood tent camping to RVing in the 1980s when the ground got too hard. They've been tutored in the ways of RVing (and RV repair) by a series of rigs, from truck campers, to a fifth-wheel, and several travel trailers. In addition to writing scores of articles on RVing topics, they've also taught college classes for folks new to RVing. They authored the book, RV Boondocking Basics.


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2 years ago

Good article- thanks!

Bob p
2 years ago

I’ve had their info in my phone ever since I bought an 18 year old motorhome, luckily I never had to use them as apparently quality control was much better back then. Maybe the RV industry was still drug testing back then, I just had to throw that in since an article appeared here that said due to the lack of people looking for work manufacturers had stopped drug testing prospective employees. Then you wonder why your new RV has all the problems they have.

Bob M
2 years ago

Electronic equipment made overseas use lead free solder. Which over time grows whiskers which can short out the circuit boards. I find that even The RV dealers refrigerator mechanics don’t seem to know everything about repairing the refrigerators. If I buy another RV I plan on going to the 12volt fridge. Would be nice if they made AC/DC fridges. Found one three way Fridge, but was only 7 cubic Ft.

3 years ago

I’ll add, take a picture of the wiring and board with your phone/camera to help remember where and how things went. Great article! Thanks

Joseph Phebus
3 years ago

When my hot water heater failed to ignite on my barely over 1-year old RV, I did some research and the general consensus is the OEM Dometic boards are from China an of fairly low quality; the Dinosaur board s are of much better quality and reliability. I replaced the board with the Dino board and everything has worked great since.

So, having planned an excursion to Alaska and not wanting to invite more trouble, I ordered Dinosaur replacement igniter board for both the refrigerator and the furnace, neither of which I want to be without in some desolate place. It was a few hundred buck for the 2 boards, but the peace of mind in knowing I’m not going to lose a freezer full of food, or have frozen toes and/or water lines makes it worthwhile. The two boards, a spare water pump, portable tire air compressor, motor oil and antifreeze are my insurance policies if I venture too far away from “civilization.”

3 years ago

Another attempt at “fixing” can be tried in the oven. Cooking the circuit board will, sometimes, re solder the broken traces. Google the process as I have only had second hand info on the process and it worked on refrigerator and tv boards.

3 years ago
Reply to  Steve

🤮 – my, my… PLEASE people, do NOT try this. It is as terrible of an idea as the bleach cure for COVID-19.

3 years ago

One more bit of info away from circuit boards. If your rv fridge isn’t working properly Norcold won’t help you. Their support line is only available to dealers because of the risks connected to working with propane. I fixed my fridge from doing some research and reading the troubleshooting section in my literature. I’ll bet that Dometic has the same policy about customer support.

John Goodell
3 years ago

I replaced a circuit board on my refrigerator a few years ago. I followed the “trouble-shooting guide” in the back of the service manual for my refrigerator to diagnose the problem. I ordered an OEM circuit board from Amazon and made sure it matched the original in every way, but especially the connections on the board. I took pictures with my cell phone of the old board before I disconnected anything, with closeups of the top left corner and bottom right corner where were multiple connectors. I spent a lot more time looking it over than actually replacing the board. And it worked great afterwards. Just be extra careful to reconnect everything exactly as before.

John Goodell
3 years ago

Skookum? I had to look it up!

Bill Kocken
3 years ago

If Dinosaur only sells to retailers, how did Russ and Tina get theirs?

3 years ago
Reply to  Bill Kocken

Maybe from a retailer?

2 years ago
Reply to  WEB

I don’t know why Russ stated that they only sell to retailers. I contacted them about the time that this article was originally published and they walked me through the same type of trouble-shooting process, checking voltages, etc. Once we determined that it was a bad control board, I ordered a replacement, directly from Dino, and it arrived two days later, delivered by FedEx.

RV Staff
2 years ago
Reply to  Tom

Hi, Tom. Here’s something copied directly from their website: “Dinosaur does not sell directly to the public. Below are links to some retailers that carry our products.” Maybe they’ve changed their policy since then but haven’t changed the copy on the website. 🙂 –Diane

Tony Sauer
3 years ago

I replaced a board with one from Dinosaur on our old travel trailer many years ago and found the installation easy and the product great. It worked for several years and even though I sold the trailer, I’m sure it’s still working. I don’t remember it being all that expensive (under $200?).

When we bought a used motorhome a few years ago, it had been sitting and the Onan generator wouldn’t start. I took the carburetor off three times and did every trick I could think of (I was a motorcycle mechanic in my teen years) to avoid spending a ridiculous amount to replace it. Finally, I decided to use a mallet and tap on the sides; pretty hard before installing it one more time before throwing in the towel and buying a new one. Fortunately that “tapping” freed whatever gunk was stuck beyond my eyes or tools reach and the generator fired up. Unfortunately all those attempts at starting the generator caused the circuit board to slowly die after a few weeks. I did some research and found an aftermarket company that had a better board than the one from Onan and a much better cost. Sorry I don’t remember the name but I’m sure a google search can help you. The reason I say it was a “better circuit board” is that it had features the original board didn’t and allowed more starting attempts before disabling itself.

2 years ago
Reply to  Tony Sauer

Amazon has replacement carbs for Onan gensets. $60 vs $300. Mine was an exact replacement, down to the casting marks. Unless you knew where to look, there is no physical difference. Shame on Onan for making sealed carbs.

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