Growatt MTL Solar Inverter | Gold Coast Solar Power Solutions

The Growatt MTL solar inverter is manufactured in Shenzhen, China.

If your Growatt MTL inverter is displaying a fault or error message on the screen we highly recommend you take action as quickly as possible, as when a Growatt MTL inverter has a fault it will not be producing any power.

To help you take action we have put together a list of Growatt MTL fault messages and possible actions to take from the Growatt MTL Solar Inverter user manual.

Should any problems arise on your Growatt MTL solar inverter, the LED on the front panel will be red and the LCD displays the relevant information. If you decide to follow the recommended actions below, please note that safety measures should be observed to avoid any risk of injury. If unsure we highly recommend you seek assistance from a qualified solar electrician.

Fault	Display	Possible Action
SYSTEM FAULT	Ground I Fault	1. The ground current is too high. 2. Unplug the inputs from the PV generator and check the peripheral AC system. 3. After the cause is cleared, re-plug the PV panel and check PV-Inverter status. 4. If the problem persists please call service.
	Isolation Fault	1. Check the impedance is between PV (+) & PV (-) and the PV-Inverter is earthed. The impedance must be greater than 8M. 2. If the problem persists please call service.
	No Utility	1. Grid is not connected. 2. Check grid connection cables. 3. Check grid usability.
	PV Over Voltage	1. Check the open PV voltage; see if it is greater than or too close to 600VDC. 2. If PV voltage is less than 600VDC, and the problem still occurs, please call local service.
	Consistent Fault	1. Disconnect PV (+) or PV (-) from the input, restart the PV-Inverter. 2. If it does not work, call service. > If there is no display on the panel, please check PV-input connections. If the voltage is higher than 150V, call your local service. > During periods of little or no sunlight, the PV-Inverter may continuously start up and shut down. This is due to insufficient power generated to operate the control circuits.

Here are some more fault messages that you may see on the Growatt MTL front panel display.

FAULT	DISPLAY	OPERATION
System Fault	Auto Test Failed	Auto test do not pass
	No AC Connection	No utility; no grid connect
	PV Isolation Low	Insulation problem
	Residual High	GFCI Fault
	Output High DCI	Output current DC, offset too high
	PV Voltage High	PV panel voltage too high
	AC V Outrange	Grid voltage out of range
	AC F Outrange	Grid frequency out of range
Inverter Fault	Error: 100	2.5 V Reference Voltage Fault
	Error: 101	Communication Fault
	Error: 102	Consistent Fault
	Error: 116	EEPROM Fault
	Error: 117	Relay Fault
	Error: 118	Init Model Fault
	Error: 119	GFCI Device Damage
	Error: 120	HCT Fault
	Error: 121	Communication Fault
	Error: 122	Bus Voltage Fault

The full information is available in the Growatt MTL solar inverter manual’s troubleshooting section.

If following the steps above does not fix the issue and your Growatt MTL inverter is still within the warranty period you can contact the equipment installer or supplier. If your inverter is outside the warranty period we suggest that you contact a professional solar power expert. If you’re on the Gold Coast or Brisbane area contact Gold Coast Power Solutions here and we will be in touch to provide you with further assistance.

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