Viking VFlex Control Board Colors Explained: How to Identify Yours and Find the Right Replacement
Replacing a control board on a Viking DC gate operator should be straightforward, but one small detail can make or break the job: the color of the Viking logo sticker on the board itself. The VFlex series uses a simple color-coded system to distinguish between three hardware generations. Getting it wrong means ordering a part that will not function correctly in your operator.
Why the Color Matters
VFlex boards come in three distinct versions, each identified by a colored Viking logo sticker affixed directly to the control board. Ordering the wrong color means ordering the wrong board entirely, because the three variants are not interchangeable. The color corresponds to the UL 325 compliance year the board was manufactured to meet, which dictates how the operator handles safety sensing and obstruction detection. Knowing your color before ordering saves valuable time and helps avoid a costly mistake on a roughly $560 part that often cannot be returned once installed.
| Logo Color | Model | Years | UL Compliance |
|---|---|---|---|
| Black | VFLEXPCB | 2013 - 2016 | Pre-UL325 |
| Green | VFLEXPCBU16 | 2016 - 2018 | UL325 2016 |
| Orange | VFLEXPCBU18 | 2018 - Present | UL 325 2018 |
What Changed Between Versions
While all three boards fit the same physical operator models, the internal safety standards and electrical protections are not the same.
- Black: The original VFlex board. It runs pre-2016 safety logic and lacks some of the refined obstruction-sensing behavior found in later boards.
- Green: Introduced updated obstruction sensing and safety behavior to satisfy the 2016 UL 325 requirements. A solid mid-generation option for operators produced between roughly 2016 and 2018.
- Orange: The current production standard. It adds enhanced surge protection, advanced LCD diagnostics, and a strict requirement for a monitored photoeye that earlier boards do not enforce.
Which Models Use the VFlex Board
The VFlex family covers the majority of Viking's DC operator lineup. Boards are used across both swing and slide models, including:
- Swing: K-2, K-2S, L-3, R-6, F-1, T-21, G-5, X-9, and I-770
- Slide: X-390 and Q-7
- H-10 and Q-7 use their own VFlex variants that follow the same black/green/orange color coding but carry separate SKUs (for example, VFLEXPCB-H10, VFLEXPCBU16-H10, and VFLEXPCBU18-H10).
If you are unsure whether your operator takes a standard VFlex or a model-specific variant, open the control box and look for the SKU printed near the Viking logo sticker before ordering.
Please Note: On the R-6, K-2, and G-5, as well as ECU solar units, the physical circuit board itself is yellow rather than the standard gray. The colored Viking logo sticker rule still applies regardless of substrate color, so look for the black, green, or orange logo on the yellow background to determine which replacement you need.
How to Identify Your Board
Finding your version is quick and requires no tools beyond a screwdriver to open the operator housing.
- Power down the operator and remove the control box cover.
- Look for the Viking logo sticker on the control board itself; the color of the logo is your identifier.
- If the sticker is missing or faded, use the production year of the operator as a rough guide and cross-reference the table above.
Still unsure? When in doubt, snap a photo of the board before you order. The SKU printed on the sticker (ex. VFLEXPCB, VFLEXPCBU16, or VFLEXPCBU18) is the safest way to confirm compatibility.
Dual Gate and Secondary Modules
Dual gate setups require a secondary module installed alongside the primary VFlex board rather than using two identical primary boards. The same three-version color structure applies to these secondary units: the black VFLEXSM for pre-UL325 systems, the green VFLEXSMU16 for 2016 UL325 compliance, and the orange VFLEXSMU18 for 2018 UL325 compliance. The secondary module must match the UL version of the primary board exactly; pairing a green primary with an orange secondary, or any mismatched combination, will cause communication and synchronization problems between the two gates that prevent proper dual-gate operation.
The Photoeye Requirement on Orange Boards
The orange board introduced a strict monitored photoeye requirement that was not present on black or green boards, making this far more than a simple compliance stamp. If you are replacing a black or green board with an orange board, you must also add a compatible monitored photoeye to the system or the operator will not function correctly after installation. This requirement is the most common oversight when upgrading from an older board, so before you install an orange replacement, verify whether your existing photoeye is monitored or plan to upgrade that component as well.
Browse Replacement Access Boards
Ready to find the right board? Browse our full selection of Viking VFlex replacement control boards.
If you have any further questions, please reach out to our representatives. They are happy to help in any way they can!
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