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Relay fault · Growatt Error 117

Growatt Error 117 — Relay Fault

Growatt documents Error 117 as a relay fault, raised when the inverter's relay check fails six times. Something is wrong with the grid-isolation relay or its circuit and the inverter stops generating. Growatt's remedy is one restart, then a warranty replacement if the code returns.
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  • Growatt-documented relay fault
  • One restart, then a warranty claim
  • Legacy TL, MTL, MTL-S and UE families
Error 117 keeps coming back?

One restart is Growatt's first step. If Error 117 returns after it, the relay or its circuit has failed and Growatt's own remedy is a replacement inverter under warranty. We read your ShineServer log and tell you which of the two you are in.

Book your free remote diagnosticError 04 (the safety fault)

Growatt documents Error 117 as a relay fault: the relay check has failed six times.

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Keith Ballard · Apr 2026 Trustpilot

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Mr Chapman · Aug 2026 Google

Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.

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Diagnosis steps

5-step diagnostic process

Work through these in order. Growatt allows one restart. After that, Error 117 is a hardware matter, not a setting.

1

Confirm the code and check which Growatt family your inverter is

Read the exact code on the inverter display or in ShineServer Fault Logs, and note when it first appeared. Growatt documents Error 117 as a relay fault on its legacy grid-tie families: TL and MTL, MTL-S, and the 10-20kUE three-phase range. On MIN TL-X and MOD TL3-X inverters the relay fault is Error 405 instead, so check the model on the inverter label before matching a code.

2

Restart the inverter once

Growatt's documented first step is to restart the inverter. Switch off the AC supply at the consumer unit, then the DC isolator, wait a few minutes, and restore in reverse order. Do not open the inverter. If the code clears and stays clear, no further action is needed.

3

Record whether the code comes back

Growatt's instruction is explicit: if the error still exists after a restart, contact Growatt service to replace the inverter. Note the date and time of every Error 117 in the ShineServer fault log. A code that returns is a hardware fault in the relay or its circuit, not a setting, so repeated power-cycling is not the fix.

4

Find the install date and serial number for the warranty claim

An Error 117 that survives a restart is a warranty matter. Find the install date and the inverter serial number from your handover pack or the label on the side of the inverter.

Note: Growatt New Energy prefaces its error-code table by warning that some codes indicate a fatal error and require you to contact the supplier or Growatt to replace the unit. Do not open the inverter to inspect the relay. The DC side stays live in daylight.
5

Note the firmware version before you raise the claim

Growatt service will ask for it. Check the current firmware version in ShineServer (Device → Info → Firmware Version) and note it alongside the model and serial number. Growatt does not list a firmware remedy for 117. The documented remedy is the restart and then the replacement. The version is still part of the information a claim needs.

6

Request a remote session if you want the claim evidenced

If the code keeps returning, we can review your ShineServer fault history, confirm how often Error 117 has been raised and what the inverter did each time, and give you a written summary to send to Growatt or your installer. The replacement itself is arranged through Growatt or the original installer.

Location

Where you'll see Error 117

Growatt LCD Display

Inverter screen shows "Error 117" with amber/orange LED. Generation stops. The inverter re-runs the relay check when it restarts.

ShineServer Portal

Log into ShineServer → Device → History. Error 117 appears with a timestamp. Note every occurrence. A repeat is what turns this into a warranty claim.

ShinePhone App

Error history tab shows Error 117 entries with dates and times.

Models

Affected Growatt models

TL and MTL series — Growatt's legacy grid-tie numbering, where Error 117 is documented

MTL-S series — same 1xx error scheme

10-20kUE three-phase — listed as "Relay fault, relay check fails 6 times" in Growatt's UE troubleshooting guide

On MIN TL-X and MOD TL3-X the relay fault is Error 405, not 117. On MIN TL-XH and SPH the scheme uses 3xx and 4xx codes alongside named messages.

Key facts

What you should know about Error 117

Error 117 is a relay fault

Growatt's troubleshooting documents give it as "Relay fault, relay check fails 6 times", and say there is something wrong with the relay or its relevant circuit.

Growatt allows one restart

Growatt's remedy is: restart the inverter; if the error still exists, contact Growatt service to replace the inverter. Repeated resetting is not the fix.

The relay is the grid-isolation relay

It is the component that connects and disconnects your system from the grid, and the inverter checks it before connecting. That is why a check that keeps failing stops generation.

A returning 117 is a warranty matter

Growatt New Energy warns that some error codes indicate a fatal error and require the supplier or Growatt to replace the unit. Keep the ShineServer fault log as evidence.

Context

About Growatt Error 117

Error 117 belongs to Growatt's legacy grid-tie error scheme, used on the TL and MTL, MTL-S and 10-20kUE families. Growatt's own troubleshooting documents give it as "Relay fault, relay check fails 6 times", and explain that there is something wrong with the relay or its relevant circuit. The inverter stops generating.

The remedy Growatt publishes is short: restart the inverter, and if the error still exists, contact Growatt service to replace the inverter. There is no setting to change. If your inverter is a MIN TL-X or MOD TL3-X, the relay fault you are looking for is Error 405, not 117.

What Growatt documents
1. Relay check has failed six times, giving a relay fault
2. Something wrong with the relay or its relevant circuit
3. Remedy: restart once, then replace the inverter
4. Different families use different numbers: MIN TL-X uses Error 405
Related pages
Useful guides
FAQ

Error 117 questions answered

Growatt documents Error 117 as a relay fault, raised when the relay check fails six times. The inverter stops generating. Growatt's remedy is to restart the inverter once, and if the error is still there, to contact Growatt service to replace the inverter. Growatt New Energy prefaces its error-code table by warning that some codes indicate a fatal error and require the supplier or Growatt to replace the unit. Treat an Error 117 that returns as a hardware fault, not a nuisance.
Yes, while it is active. The inverter has stopped generating, so nothing is exported and no export payment accrues for that period. A single Error 117 that clears on a restart costs very little. One that keeps returning should be dealt with, because the inverter is out of service every time it trips.
Growatt's own troubleshooting says there is something wrong with the relay or its relevant circuit, and that the code is raised when the relay check fails six times. The relay is the one that connects and disconnects your system from the grid. Growatt does not attribute Error 117 to array size, export limits, CT clamps or bright weather.
It belongs to Growatt's legacy grid-tie numbering: the TL and MTL series, MTL-S, and the 10-20kUE three-phase range. On MIN TL-X and MOD TL3-X inverters the relay fault is Error 405. On MIN TL-XH and SPH hybrids the scheme uses 3xx and 4xx codes alongside named messages. Check the model on the inverter label before matching a code.
No. Growatt's documented remedy allows one restart. If the code comes back, the relay check is still failing and the remedy Growatt gives is a replacement inverter, not another reset. The relay is the component that isolates your system from the grid, so a check that keeps failing is not something to work around.
The remote diagnostic is free. We read your ShineServer fault log and tell you whether the restart held or the relay check is still failing. If it is still failing, this is a warranty matter with Growatt rather than a remote fix, and we'll tell you so at no charge.
Usually the same day. We read your ShineServer fault log and generation curve in a 30-minute remote session, confirm how often Error 117 has been raised, and send you a written summary you can pass to Growatt or your installer. For other codes, see the Growatt fault code index.
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Error 117 affecting your system?

Tell us how often Error 117 is occurring. We'll review your ShineServer fault history to confirm whether the restart held or the relay check is still failing, and give you a written summary for the warranty claim.

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