Sunny Roo error codes explained

EPO (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter Output over-current (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter over-load (see manual troubleshooting table for detail)

What you can do

• Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit
• The system usually recovers by itself once the load drops
• If it keeps happening with normal loads, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

DC_BUS pre-Charge fail (see manual troubleshooting table for detail)

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter short-circuit (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

INVERTER voltage abnormal (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter PLL fail (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

DC_BUS over-voltage (see manual troubleshooting table for detail)

What you can do

• Do not touch the DC isolators or cables
• Note the time - this often shows on cold, very sunny mornings
• Call your installer - the panel strings may need to be checked against the inverter's limits

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

DC_BUS under-voltage (see manual troubleshooting table for detail)

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter output DC current over (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

EEPROM ERROR on the control board (see manual troubleshooting table for detail)

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

DC_BUS discharge fail (see manual troubleshooting table for detail)

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter Over temperature (see manual troubleshooting table for detail)

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Output Relay fail (see manual troubleshooting table for detail)

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Output Current sense fail (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

BOOSTER_A over-current (see manual troubleshooting table for detail)

What you can do

• Check solar generation in the app compared with similar days
• Do not touch the DC isolators, cables or connectors, and don't go on the roof
• If it doesn't clear by itself, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

BOOSTER_B over-current (see manual troubleshooting table for detail)

What you can do

• Check solar generation in the app compared with similar days
• Do not touch the DC isolators, cables or connectors, and don't go on the roof
• If it doesn't clear by itself, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Heat Sink Over temperature (see manual troubleshooting table for detail)

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Rating setting of Driver board does (see manual troubleshooting table for detail)

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter Voltage unbalance (see manual troubleshooting table for detail)

What you can do

• Check that your home Wi-Fi/internet is working and restart your router
• Wait an hour - monitoring often reconnects by itself
• If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Utility Voltage Over-Voltage (see manual troubleshooting table for detail)

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Utility Voltage Under-Voltage (see manual troubleshooting table for detail)

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Utility Voltage Over-Frequency (see manual troubleshooting table for detail)

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

GFDI (see manual troubleshooting table for detail)

What you can do

• Keep clear and do not touch the inverter or cabling
• Note the code, date and time
• Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code

Utility Voltage Under-Frequency (see manual troubleshooting table for detail)

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SR series grid-tie inverter · Guide only. All work must be done by a licensed electrician. Get help with this code