GO ONLINE TO THE MANUFACTURER WEB SITE, FIND YOUR UNIT AND WHAALA! O.K Using a search engine, enter the name of the unit manufacturer. find the home page of the manufacturer and click it. Look for the "support" area and click that. They will then ask,(or provide a pull down menu) for the type of unit in question and, (another menu) the model, type or number. Click on yours. If they fail to list your exact one, choose the closest to yours you can find or if all else fails just guess. The end result, from any of the three suggestions, will be a copy paste or a pdf download of the information you need. Even if the info is for another model etc. You'll notice the codes they show are generally within the same number range. From there it's guess work but you're closer, Stay within 10 to 20 digits apart
