9
Maintenance and Cleaning
9
Maintenance and Cleaning
9.1. Checking heat dissipation
If the inverter regularly reduces its output power due to high temperature, please
improve the heat dissipation condition. Maybe you need to clean the heat sink.
9.2. Checking the DC switch
Checking externally visible damage and discoloration of the DC switch. If there is
any visible damage to the DC Disconnect, or visible discoloration, contact the
installer.
Once a year, turn the rotary switch from the On position to the Off position 5 times
in succession. This cleans the contacts of the rotary switch and prolongs the
electrical endurance of the DC Disconnect
9.3. Cleaning the Inverter
9.3. Cleaning the Inverter
If the inverter is dirty, clean the enclosure lid, the display, and the LEDs using only
clean water and a cloth. Do not use any cleaning agents (e.g. solvents or abrasives).
10
Trouble Shooting
10
Sometimes, the PV inverter does not work normally, we recommend the following
solutions for common troubleshooting. The following table can help the technician
to understand the problem and take action.
10.1 Warnings(W)
Warnings(W) identify the current status of the Growatt MTL. Warnings do not relate
to a fault. When a (W) with a number after it appears in the display, it indicates a
Warning Code and is usually cleared through an orderly shutdown/re-set or a self
corrective action performed by the inverter. See the (W) codes in the following table.
Error message
Description
Suggestion
No AC Connection
No utility grid
connected or utility
grid power failure.
1.Check AC wiring, especially
the ground wire 2.Contact Growatt.
AC V Outrange
Utility grid voltage is
out of permissible
range.
1.Check grid voltage.
2.If the error message still exists
despite the grid voltage being within
the tolerable range, contact Growatt.
AC F Outrange
Utility grid frequency
out of permissible
range.
1.Check grid frequency.
2.If the error message is displayed
despite the grid frequency being within
the tolerable range, contact Growatt.
Over Temperature
Temperature outrange
1.check the inverter operation state
2.If the error message is displayed still,
please contact Growatt.
PV Isolation Low
Insulation problem
1.Check if panel enclosure ground
properly.
2.Check if inverter ground properly.
3.Check if the DC breaker gets wet.
4.If the error message is displayed
despite the above checking passed,
contact Growatt.
Output High DCI
Output current DC
offset too high
1.Restart inverter.
2.If error message still exists,
contact Growatt.
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