Motech Solar Inverter Repair

motech inverter repairMOTECH solar inverters are a pretty good unit, however they do have one very common problem.


There are two options if your MOTECH solar inverter has stopped working.

  • Option 1: Purchase a new Inverter.
  • Option 2: Get the Inverter Repaired.


Option 1: Purchasing a new Inverter to replace the MOTECH.

If you decide you want to purchase a new inverter, then we suggest the following inverter choices. We base this on knowing the inverters below will just plug straight into your existing MOTECH installation, which means your electrician will easily do the swap over for you.

Motech PVMate 2500-AU – Solis 3kW Grid Connect Inverter

Motech PVMate 3300-AU – Solis 3kW Grid Connect Inverter

Motech PVMate 5000-AU- Solis 5.0kW Grid Connect Inverter

Option 2: Get the MOTECH Solar Inverter Repaired

This is where we can help.. the process is straight forward. You will need to arrange for an electrician to get the inverter off the wall and into a box; once done we will arrange a courier to pick it up and send it to us, we will fix it, and have it sent back to you – the whole process takes about 14 days from pickup to drop off.
We have only ever seen one fault with the MOTECH inverters:

Relay Failure

The output relay fault is a very common problem; sometimes it means the relays need to be replaced, sometimes it will be the output filter capacitors collapsing; either way the inverter will need to be sent to us for repair. When we repair the relays we use OMRON relays, there are a robust industry leading relay and will give much better service life.

Send your Inverter for Repair

Common Fault Codes


Error Message Description
GridNA No AC voltage is detected on the grid side.
Drift Fac Islanding is detected
VacH The AC voltage of mains utility is over the upper limit.
VacL The AC voltage of mains utility is under the lower limit.
FacH The frequency of AC voltage of the utility is over the
upper limit.
FacL The frequency of AC voltage of the utility is under the
lower limit.
VpvH The DC voltage of PV array is over the upper limit.
VpvL The DC voltage of PV array is under the lower limit
Imax_AC Over current on the AC side.
DeltaZ The rate of change of the AC grid impedance is higher
than setting value
Zac The AC impedance of the grid is out of range.
InvTempMax The internal temperature of the inverter exceeded the
safe operating limit.
COMM External communication failed.
RelayX(X=1~4) Grid connection relay failed.
FastEarthCurrent The drastic change of the leakage current has been
Riso The insulation resistance between PV array and the
ground is below the safe operating limit.
VdcbusH Internal DC bus voltage is over the upper limit.
VdcbusL Internal DC bus voltage is under the lower limit
Internal COMM Internal communication failed.
Watchdog Internal watchdog function triggered.
Idc Test The DC injection current measurement function failed.
RCMA The leakage current exceeded standard value.
RCMA Test The leakage current measurement function failed.
IR Test The insulation resistance measurement function failed.
Offset Offset check for grid monitoring failed.
Temp. Sensor The internal temperature sensor failed.
RAM Test Memory failed
System Error The system failed.
Version Error The firmware version is not correct.
Delta Fac Internal measurement comparison error or defective
Delta Vac
Delta Zac
Delta If
Delta Riso
Delta Idc
Delta Asyn
IpvA,IpvB,IpvC Over current on the DC side
CalDataError Calibration data is out of range
CalDataLoss Calibration data is lost.
AutoTest Error Autotest fail

For more information regarding this inverter click on the link below to view the user manual

MOTECH operating manual