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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | GM92089 |
| Controller Model | RDC2 |
| Manages | Generator set + Model RXT transfer switch (ATS functions require RXT) |
| Display | 2-line x 16-character backlit LCD, adjustable contrast |
| Keypad | Membrane keypad: OFF / AUTO / RUN pushbuttons + select/arrow navigation |
| Indicators | LED indicators for OFF/AUTO/RUN modes, utility/genset source, ATS position |
| Governor | Digital isochronous governor, steady-state speed at all loads |
| Voltage Regulation | ±1% no-load to full-load |
| Connectivity | Ethernet connector; optional OnCue Plus remote monitoring |
| Diagnostics | 70+ diagnostic messages, maintenance reminders, scrolling status display |
| Monitored Parameters | Voltage, frequency, engine temperature, oil pressure, battery voltage, runtime hours |
| Additional Features | Programmable exerciser, smart engine cooldown, built-in battery charger |
| Compatible Generator Sets | 10RESV through 38RCLC and similar RCL/RCA residential/commercial models |
Product Introduction & Supply Chain Strategy
The RDC2 is the single digital controller that runs both the generator set and, when paired with a Model RXT transfer switch, the ATS logic — governing engine speed, voltage regulation, exercise scheduling, and fault diagnostics from one backlit LCD interface. It’s the component homeowners and service techs interact with directly, and it’s also the most common failure point reported after a lightning strike or extended power event.
Because a genset with a failed controller can’t start automatically during an outage, keeping GM92089 as a buffer stock item on the shelf avoids the exact scenario the unit exists to prevent — an emergency truck roll during a storm when lead times stretch. New Surplus sourcing keeps unit cost below emergency OEM pricing while guaranteeing full compatibility with the original RXT pairing and menu configuration.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Set the generator’s OFF/AUTO/RUN switch to OFF and disconnect utility power to the transfer switch before opening the controller enclosure. Put on a grounded ESD wrist strap. Photograph all wiring harness connections and controller mounting orientation before disconnecting anything.
Stage 2: Removal
Disconnect the wiring harness connectors from the controller in the order noted in your photos, then release the mounting screws or clips securing the controller to the enclosure. Lift the unit free without straining the harness connectors.
Stage 3: Installation (Clone & Seat)
Mount the replacement GM92089 controller in the same position, then reconnect each harness connector exactly as documented — connector keying generally prevents cross-plugging, but confirm each seats fully.
Stage 4: Power-On & Testing
Restore battery and utility power, then confirm the LCD lights and displays the expected status screen without a fault code. Run a manual start cycle (RUN mode) to confirm the isochronous governor stabilizes engine speed, then return the switch to AUTO and verify the exerciser schedule and system settings match the original configuration.
RDC2
RDC2
Firmware/Software Versions & Upgrade Notes
The RDC2 controller runs on Kohler’s onboard control firmware, which is factory-loaded and not user-flashable in the field under normal service procedures. What matters for a swap is configuration matching: exerciser schedule, voltage/frequency setpoints, and transfer switch pairing settings are stored in the controller and must be re-entered through the keypad menu after installation, since a replacement unit ships with factory defaults.
If your generator set uses OnCue Plus remote monitoring, confirm the replacement controller’s network/Ethernet configuration is re-paired to your OnCue account after installation — a controller swap will not automatically carry over the prior unit’s remote monitoring registration. There is no user-initiated firmware upgrade/downgrade path for this controller; any firmware-level revision is handled through Kohler service channels, not a field update.
Frequently Asked Questions (FAQ)
Is this a new unit, or is it refurbished?
It’s New Surplus — original Kohler manufacture, never installed in a running generator set. It’s not a pulled, repaired, or cosmetically restored board.
Is the RDC2 controller still in current production, or should I be worried about future availability?
The RDC2 remains Kohler’s current controller platform across a wide range of residential and commercial standby generator sets, so this isn’t an EOL part — but as the most frequently replaced component after a fault event, keeping one on the shelf is still a sound buffer-stock decision for critical standby power applications.
Can I hot-swap the controller while the generator is running?
No. Set the unit to OFF and disconnect both utility and battery power before opening the controller enclosure or disconnecting any harness.
Will I lose my exerciser schedule and settings when I replace the controller?
Yes — settings live on the controller itself, so you’ll need to re-enter your exerciser schedule, transfer switch pairing, and any custom setpoints through the keypad menu after installation.
What’s the warranty on a New Surplus unit?
We back New Surplus GM92089 controllers with a 1-2 year warranty, well below the cost and risk profile of an unverified used board with no warranty coverage.
How do I confirm this is a genuine Kohler part and not a counterfeit?
Every unit ships with an OEM packing slip, a verifiable Kohler part number, and our QC test report confirming display, keypad, and communication checks passed before shipment.
