Order by part number. Get the exact fit.

Read the data plate first: the model number plus the manufacturer part number (MPN). On control boards it is printed on the PCB silkscreen or a barcoded label; on RV fridges it is inside the lower exterior control box (for example Norcold 628661 or 639593); on rooftop air conditioners it is under the shroud on the unit data plate. Enter that number in the search above — dashes, spaces, and capitalization are optional.

No. Search ignores punctuation and case, so 0H6680D, 0H6680-D, and 0h6680d all resolve to the same Generac Nexus controller. If several revisions exist, the product page lists the models each revision fits so you can confirm before ordering.

Yes. We catalog genuine manufacturer components and Tier-1 certified direct replacements sourced through authorized commercial distributors — Kohler, Generac, Dometic, Norcold, Suburban, Coleman-Mach, Lippert, Rhinox, Olympic Kilns, and others. Every listing shows the exact MPN, brand parentage, and known equipment lines.

In-stock orders placed before 2 PM ET ship the same business day. Standard parcel transit is 2–5 business days, and standard freight over $300 ships free. Expedited 1–2 day parcel and palletized LTL freight are available at checkout for heavy attachments and kilns.

Yes, within 30 days, provided electronic boards remain in their original sealed anti-static bag and were never powered on — once power is applied a board cannot be resold as new. Wrong-part and defective returns ship back free with a prepaid label; customer-remorse returns carry a 15% bench-test restocking fee.

Yes. Approved shops, fleets, municipalities, and service centers can check out with a PO number on NET-30 terms, request a formal RFQ quote for volume orders, and manage tax-exempt certificates through our support team.

Often, yes. Send the obsolete MPN, equipment model, and serial through the contact form or an RFQ. Our specialists cross-reference superseded numbers — for example older Norcold 621991 boards replaced by 628661 — and Dometic, Atwood, and Coleman legacy lines.

Online checkout serves the 50 US states, with tax calculated by delivery state. Alaska and Hawaii ship parcel via USPS Priority or UPS 2nd Day Air. Canadian buyers can order through a US freight forwarder — email shipping@exactpartsupply.com for a cross-border freight quote.