The Safe Way to Reset Your Deye Inverter

Quick answer

Deye’s official manuals prescribe restarting the inverter as the first response to many fault codes — and for some codes the manual gives the exact procedure: turn off the DC switch and the AC switch, wait one minute, then turn the DC and AC switches back on. On hybrid models, include the battery and PV-array breakers in the shutdown order. Deye manuals also document a menu-based Factory Reset (Basic Setup, password 9999) that wipes all parameters — treat that as installer territory, not a routine fix.

Two different kinds of reset

It helps to separate what you are trying to do. A power-cycle restart clears temporary faults and reboots the control system without changing any settings — this is what the Deye fault tables mean when they say restart the inverter. A factory reset restores every parameter to factory defaults, erasing your battery settings, work modes, grid configuration, and time-of-use schedules. The first is a safe homeowner-level action for transient faults; the second should only be done by your installer, who will then need to recommission the system.

Power-cycle restart: the documented procedure

For hybrid inverters (SUN-5/8/12K-SG04LP3 and similar), Deye manuals document a shutdown order. Reverse it to restart. If your unit is a grid-tied string inverter without batteries, simply skip the battery steps.

1. Acknowledge the alarm on the touchscreen and write down the exact fault code (for example F13, F16, or F20) before clearing anything.
2. Turn off the AC grid breaker.
3. Turn off the PV array breaker.
4. Turn off the battery breaker (hybrid models).
5. Turn off the DC switch on the inverter itself.
6. Wait until the display turns off completely — and wait a full minute after a fault, as the manual specifies for the restart procedure.
7. Turn the DC switch back on.
8. Turn the battery breaker back on (hybrid models).
9. Turn the PV array breaker and the AC grid breaker back on.
10. Let the inverter boot and run its self-test, then check the display for status messages and confirm normal operation.

Factory reset: what the manual actually says

Deye’s hybrid manuals include a Factory Reset option under the Basic Setup menu: it resets all parameters of the inverter, and the documented password for factory settings is 9999 (the lock-out password is 7777). Because a factory reset erases battery configuration, work modes, and grid settings, do not run it to clear a fault. If an installer recommends a factory reset, let them perform it and recommission the system afterward — an incorrectly configured hybrid inverter can misbehave badly, especially with lithium batteries.

Faults where you should NOT restart

Not every Deye fault is safe to restart through. The manuals single out arc faults (F63 on documented models): an arc fault means a DC arc was detected on the PV side, and the correct response is to stop the system and have a certified technician inspect every DC connection before recommissioning — treat it as a potential fire risk. Likewise, never restart repeatedly into the same persistent fault; the manual’s instruction after a failed restart is to contact your installer or Deye service, not to keep cycling power.

When to call a professional

Call your installer or Deye service if:

• The fault code returns after a proper one-minute power cycle — especially F16 (leakage current), repeated F20 (DC overcurrent), or any insulation fault.
• You get an arc fault (F63) — stop the system and get a certified technician to inspect all DC connections first.
• There are signs of heat, burning smells, discolored cables, or damaged breakers anywhere in the system.
• The inverter will not boot, the display stays dark, or the battery bank behaves abnormally.
• You need to change battery BMS settings, grid codes, or work modes — those menus exist for professional installers.

Have your model number (for example SUN-8K-SG04LP3), serial number, the exact fault code, and a description of when the fault appears ready when you call.

Frequently asked questions

Will a restart delete my Deye inverter settings?

No. A power-cycle restart preserves every setting — battery configuration, work modes, schedules, and grid parameters are all retained. Only the menu-based Factory Reset erases parameters, which is exactly why it should be left to your installer.

How many times may I restart to clear a fault?

Deye manuals suggest restarting once, and in some fault entries restarting the system two to three times. If the fault is still present after that, the manual’s next step is always the same: contact your installer or Deye service. Repeated power cycling beyond that point risks masking a real electrical fault.

What is the factory reset password on a Deye hybrid inverter?

The manuals document 9999 as the factory-settings password (7777 is the lock-out password). Knowing the password does not make a factory reset safe to run casually — it wipes all parameters and the system must be recommissioned afterward, so leave it to your installer.

My Deye inverter shut down at low battery and will not come back. Is a reset the answer?

Probably not a settings reset. Hybrids shut the DC/AC module down at the configured Shutdown SOC and only resume output when the battery recovers to the Restart SOC (these thresholds are in the Battery Setup menu). If the battery is deeply discharged, the documented battery-recovery behavior is to let PV or grid slowly recharge it — forcing repeated restarts will not help and may stress the system. If the battery never recovers, call your installer.

Related error codes

• Deye W03 error code — what this warning means and the safe checks to run before restarting.