Quick Answer: To reset a Cummins generator, shut down and electrically isolate the set, open the controller, clear the active fault codes through the PowerCommand menu, run the reset function, then restart and run a loaded test. Never reset a fault without identifying its cause first, and follow NFPA 110 test intervals for emergency power.

• Isolate the set from load and battery before opening panels.
• Read and record the fault code before clearing it.
• Use the controller menu to clear the code, then run a controlled reset.
• Restart, run a loaded test, and confirm no fault returns.

When a Reset Is the Right Action

A reset clears a latched fault or returns the controller to a known state after an event such as a utility outage, an exercise cycle, or a detected anomaly. On a Tesla Power Cummins-powered generator set, the PowerCommand controller logs the fault so you can see what triggered the shutdown. Resetting without reading the code hides the root cause and risks repeated trips under load, which is the worst outcome for a set meant to provide backup power. Treat the reset as a diagnostic step, not a cure, and always record the code before you clear it.

Safety Before You Touch Anything

Generators combine high voltage, rotating machinery, hot surfaces, and stored fuel. Before opening any panel, move the set to OFF, open the main breaker, and lock out the battery disconnect where fitted. A standby generator set can start automatically on a utility failure, so isolation is mandatory even when you believe it is stopped. Use insulated gloves rated for the system voltage, eye protection, and non-conductive tools. Avoid loose clothing near rotating parts even when the set is stopped, because an auto-start event can occur without warning while the panel is open.

Step-by-Step Reset Procedure

The following sequence applies to typical Cummins PowerCommand controllers. Exact menu labels vary by model, so always cross-check the controller manual for your set. Step one is to shut down and isolate: set the mode switch to OFF, open the output breaker, and disconnect the battery, then verify zero voltage at the breaker terminals. Step two is to open the control panel and wait for any residual capacitance to discharge, recording the displayed fault and any event log entries before clearing them. Step three is to clear the fault codes by navigating to the alarms or diagnostics menu, selecting the active fault, and choosing acknowledge or clear; the controller logs that the code was cleared, which is useful for your service history. Step four is to run the reset from the main menu, choosing a soft reset that restarts the controller without losing setpoints rather than a hard reset that restores factory defaults. On a Cummins diesel generator set, prefer the soft reset unless a technician directs otherwise. Step five is to restart and test: reconnect the battery, close the panel, set the mode to AUTO or manual as required, start the set, run it under load for the period specified in your maintenance plan, and confirm no fault returns.

Common Faults That Trigger a Reset

Understanding the code stops you from simply masking a real problem. The most frequent triggers are low battery voltage, coolant high temperature, overspeed, oil pressure loss, and communication loss with the ATS. A weak starting battery is the leading cause of failed starts; if the fault is battery-related, charge or replace the battery, because resetting alone will not prevent a repeat failure on the next outage. High coolant temperature or overspeed indicates a cooling or governing issue that deserves investigation before the set is returned to service, because these protections exist to prevent engine damage. Communication loss with the ATS often points to a wiring or configuration issue rather than a fault in the generator itself, and it should be traced rather than repeatedly cleared.

Preventive Maintenance to Avoid Repeated Resets

Most resets are symptoms of deferred maintenance. A scheduled program prevents the faults that force a reset in the first place. Keep the starting battery charged and load-tested, service the cooling system on interval, and verify sensor readings during each exercise cycle. Tesla Power recommends logging every fault as part of your service history so patterns become visible over time, and treating a single unexplained reset as a prompt for inspection rather than a routine clear. Sites that run a disciplined maintenance plan see far fewer emergency resets and far higher confidence that the set will start when the utility fails.

Commissioning and Handover Records

The reset behaviour you experience later is shaped by how the set was commissioned. A proper commissioning includes a factory test record, a documented load test, and a written set of controller setpoints including ATS timing and transfer settings. Keep these records with the set so that any future reset, especially a hard reset, can be restored to the correct configuration without guesswork. Tesla Power reviews the real load profile, voltage, frequency, duty rating, and installation environment before confirming any configuration, so the parameters handed over match the site rather than a generic default. Good handover documentation is what turns a one-off reset into a managed, repeatable procedure.

Testing After a Reset

After any reset, the set should complete a loaded test. Emergency and standby power systems are evaluated against NFPA 110, which defines testing and performance expectations for emergency power. A successful reset is only proven when the set starts, carries load, and transfers correctly through the ATS. Tesla Power supports commissioning and service and can interpret controller logs against the original ISO 8528-1 rating so the set is restored to its designed duty. Running a no-load start is not sufficient evidence of health; the load test is what reveals whether the fault was genuinely cleared or merely hidden.

When to Call a Service Technician

If a fault recurs immediately, if you see a code you cannot identify, or if the set has tripped on a protective limit such as overspeed or low oil pressure, contact a qualified technician. These conditions protect the engine and should not be bypassed. Tesla Power reviews the real load profile, voltage, frequency, duty rating, and installation environment before confirming any remediation, so the fix matches the set rather than a generic workaround. Attempting to defeat a protective trip to keep the set running is dangerous and can turn a service call into a major engine failure, so the disciplined path is to investigate, repair, and then re-test.

Environmental Factors That Influence Resets

Site conditions change how the controller behaves, and most unexpected resets trace back to the environment rather than the engine. Cold weather thickens engine oil and stresses the starting battery, so winter is the season of most failed starts and the related low-battery faults. High altitude reduces air density and can trigger governing or temperature faults if the set was not derated for the site during specification. Humidity and salt-laden coastal air accelerate corrosion on sensors and connections, producing intermittent communication faults with the ATS that clear on reset but return under load. Account for these in your maintenance plan so a reset is never the first sign that the environment has been working against the set. A Tesla Power standby generator set specified for your climate will reset far less often than one sized only for ideal conditions, because the weak points were addressed before commissioning rather than discovered during an outage.

Spare Parts to Stock for Faster Recovery

The fastest reset is the one you never need because a worn part was replaced before it failed, but when a fault does occur, local stock decides how long the set is down. Keep at minimum a starting battery or a known-good charger, a set of filters, drive belts, coolant hoses, and a spare controller fuse kit. Sensors such as coolant temperature and oil pressure are cheap and fail without warning, so stock the exact types your controller expects. Tesla Power documents the consumable list for every set during commissioning so your storeroom matches the machine rather than a generic guess. For sites where downtime is unacceptable, hold a complete sensor set and a spare controller module; a reset that still leaves the set dead is no backup at all, and the difference between minutes and days of recovery is almost always the parts on the shelf. Review this list with your service provider each year and again after any major fault, because consumption patterns shift with operating hours and site conditions, and a storeroom built for the commissioning year may no longer match how the set is actually used. Where the generator protects a critical load, holding a complete sensor set and a spare controller module converts what could be a multi-day outage into a same-day recovery, which is the real measure of whether the backup power investment is doing its job.

Frequently Asked Questions

Will resetting erase my generator settings?

A soft reset does not erase configured setpoints; a hard reset restores factory defaults and does. Use the soft reset unless a technician instructs otherwise, and record your parameters beforehand so they can be re-entered if needed.

Why does the fault come back after reset?

The fault returns because the underlying cause was not fixed. Low battery, cooling, or sensing issues must be resolved, not just cleared, before the set is reliable. A recurring code is a diagnosis, not an annoyance.

Can I reset the generator while it is running?

No. Isolate the set and stop it first. Opening a live panel or resetting under load is unsafe and can damage the controller. Always move to OFF, open the breaker, and disconnect the battery before work.

How often should I test after a reset?

Run a loaded test per your maintenance plan and the relevant standard such as NFPA 110. For emergency power, regular monthly or more frequent testing is typical; confirm the interval for your site class with your service provider.

What if the controller will not restart after reset?

Check battery voltage, the disconnect, and the fuses on the control supply. If the display stays dark, the issue is power to the controller rather than the reset itself, and a technician should inspect it before further attempts.

Do I need to reconfigure the ATS after a reset?

Usually not after a soft reset. After a hard reset, re-enter all setpoints including ATS timing and transfer settings from your recorded configuration before returning the set to automatic mode.

Is it safe to clear fault codes before servicing?

Record the code first, then clear it. Clearing without recording loses the diagnostic clue. Tesla Power recommends logging every fault as part of your service history so patterns become visible over time.

References

• NFPA 110 — Standard for Emergency and Standby Power Systems
• ISO 8528-1 — Generating set rating and performance
• EPA emission standards for engines

Related reading: Tesla Power generator set range, Cummins-powered generator set, Cummins diesel generator set, how to size a diesel generator, standby diesel genset.