GivEnergy Fault Code Index

No AC supply detected at the inverter. Check the AC isolator below the inverter is switched on. Check for tripped breakers at the consumer unit on the solar circuit. Check AC terminal connections are tight.

Same as INV_NO_UTILITY but on an AC-coupled All-in-One or storage variant. AC supply not detected. Check the AC isolator, consumer unit breakers, and the AC terminals at the inverter.

Do not reset this one. The inverter has detected DC voltage finding a path to earth. Isolate at the consumer unit and leave it isolated: a reset simply re-energises the fault. The wiring insulation has to be inspected before any restart. Note for whoever attends: insulation-resistance testing is done with the PV and battery DC disconnected from the inverter and measured from the cable ends. Meggering across a landed inverter destroys its input stage.

The same ground fault on an AC-coupled All-in-One or storage variant, and the same rule. Do not reset. Isolate at the consumer unit and get the insulation inspected before anything is switched back on.

A short detected on the battery discharge side. On a fresh install treat this as reversed battery DC leads until proven otherwise. The battery DC conductors sit at full pack voltage — roughly 50 V on LV, over 300 V on HV, even with the MCB open. Isolate and prove dead before touching the leads. Engineer only.

String voltage from solar panels exceeds the inverter limit — 580V on Gen 1, Gen 2 and Gen 3 3.6/5.0 hybrids; 600V on the Gen 3 8.0. Do not touch DC cabling. Requires an engineer to check the panel string configuration — usually too many panels in series for cold-day Voc.

Same as INV_PV_OVER_VOLTAGE on the AIO range. String voltage exceeds the inverter’s Max. PV Voltage. Do not touch DC cabling — engineer required.

Inverter heatsink temperature exceeded its safe operating threshold. Check ventilation clearances per the installation manual. No direct sunlight, not enclosed in a sealed cabinet. Clear dust from heatsink vents. If ambient is in range and vents are clear, an internal fan may have failed.

Inverter has lost communication with the battery BMS. On LV GivBat batteries (51.2V) comms are RS485, not CAN: in the plug-in battery cable on batteries with a plug connector (Gen 2 and Gen 3), or a separate data cable on Gen 1. At the inverter the comms land on a green pin connector on a Gen 1 (a Gen 1 battery uses one too), an RJ45 BMS port on a Gen 2 and a plug on a Gen 3. On a Gen 2, a thick comms cable crimped straight into the RJ45 plug is the commonest fault we see. Check the battery is switched on, the DC MCB is up, dip-switch addressing is correct (Master = 0,0,0,0; Slave 1 = 1,0,0,0 etc.), and the comms connector at each end looks fully home. If one looks loose, do not push or pull it with the system running: on batteries with a plug connector the same plug-in cable carries battery power, so an engineer reseats it with the system isolated. On HV stackable batteries the inverter-to-battery interface is CAN — check the orange HV-kit connector. BMS Comm Fail guide →

Persistent battery comms failure — the warning escalated. The battery has stopped responding to inverter requests. Check the comms cable (RS485 on LV GivBats; CAN on the HV stackable kit), do a full restart in the correct order, and look for a firmware mismatch between battery and inverter. BMS Comm Fail guide →

Battery voltage is critically low. Ensure the battery is switched on (press the side button until the LEDs illuminate) and the first SoC LED is green. Check the DC MCB is in the ON (up) position. It is built into Gen 2 and Gen 3 batteries, and is a separate breaker between the inverter and the battery on Gen 1.

Battery voltage has dropped below the safe minimum threshold — BMS has entered protection. Commonly caused by deep discharge during EPS operation or a prolonged outage. A slow controlled recovery charge is needed; STS can run this remotely over modbus where the BMS allows. Battery fault guide →

SoC is critically low. Ensure the battery is on. Check the discharge cut-off SoC in Battery Options — if set high the battery may be holding back. Note: per the GivEnergy cold-weather KB, charging is inhibited below 0°C and discharge is allowed to about −1°C, so on a frosty morning the system may sit at low SoC until cells warm.

Battery voltage is low. Ensure the battery is on and the DC MCB is ON. If the battery is on and voltage stays low after a charge attempt, the BMS may be in a protection mode requiring an engineer-led recovery.

Battery cell or BMS temperature has exceeded its safe limit. The BMS will suspend charge and discharge to protect the cells. Per the GivBat datasheets the operating window is 0–50°C charge / ‒10–50°C discharge (Gen 3) or 0–55°C / ‒10–55°C (Gen 1/2). Ensure the battery is not in direct sunlight, no loft installs in summer, ventilation around the unit is adequate. Do not attempt to charge while the fault is active.

Load on the backup output exceeded its rating. Hybrid EPS terminals, per datasheets: Gen 2 5.0 = 3.6kW; Gen 3 3.6 = 3.6kW; Gen 3 5.0 = 3.6kW; Gen 3 8.0 = 8kW with a 50A pass-through; Gen 3 10.0 = 10kW (per its manual). The Gen 1 All-in-One (6kW and 3.6kW models) has no EPS terminal: it backs up the whole house through a Giv-Gateway, at 6kW continuous / 7.2kW peak off-grid (the AIO 3.6 is 3.6kW on-grid). AIO 2 + MPPT = 12kVA continuous / 14.4kVA peak off-grid. Reduce the load on the backup circuit — strip out electric showers, kettles and ovens. EPS-circuit rewiring is an engineer job. EPS guide →

Grid AC voltage exceeded the upper threshold. Gen 1/2/3 5.0 datasheets list grid range 180–270V; Gen 3 3.6 lists 180–272V. The disconnection settings come from EREC G98 and G99, the network operator connection standards, not from GivEnergy: 262.2V after 1 second and 273.7V after 0.5 seconds. 253V is the limit the network itself has to stay within. Check AC isolator and terminal connections; if sound, contact your DNO. Common on sunny days in areas with high solar density. Grid overvoltage guide →

Grid AC voltage dropped below the lower threshold. Check AC isolator and connections. If sound, the supply at your property is outside acceptable limits — contact your DNO.

No PV generation detected during the commissioning check. On hybrid inverters confirm the DC switch is on and the panel strings are present. On AC-coupled AIO systems, generation is monitored via the EM115 (single-phase external meter) or GEM120 (CT-based monitoring) — not a PV-string CT clamp. Confirm the meter is connected and powered.

Per the GivEnergy KB ("Understanding and Removing a Smart Tariff Inverter Lockout"), an active energy-tariff agreement (e.g. Octopus Intelligent) has locked inverter controls. Symptom: settings refuse to save, schedules will not update. Only the energy provider can lift the lockout — do NOT delete the API key first, that orphans the lockout. Contact the tariff provider to be removed from the integration cleanly.

Communication with the external meter has failed. The meter is likely an EM115 (single-phase, mounted close to the inverter) or GEM120CT (CT-based monitoring bundle). Check the meter comms cable is in the correct socket on the underside of the inverter and that polarity (power and comms) is correct.

The portal has not received data from the dongle recently. Check the dongle LED — solid means WiFi up. KB-documented WiFi requirements: 2.4 GHz only, WPA2 (not WPA3), RSSI ≥ 60–70% in the dongle STA interface, port 7654 open outbound. Port 7654 being blocked by a router/firewall change is the single most common cause. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. If the signal doesn't reach, a WiFi extender is an extra £75, and we carry them with us. Portal offline guide →

Meters have not been enabled in the commissioning portal. Go to My Inverter → Remote Control → Enable Meters and enable the number of meters installed. Installer commissioning step rather than an end-user action.

The grid CT clamp (ID1) is the wrong way round. Per the GivEnergy installer manual and portal commissioning docs, the directional arrow on the CT body must point away from the consumer unit, in the direction of grid-import current flow. A reversed CT inverts import/export readings. CT clamp guide →

Battery is not charging from excess solar. Restart inverter and battery in the correct sequence. Check system mode, CT direction, and SoC limits. Battery not charging guide →

Battery is not discharging to meet house demand. Restart inverter and battery in the correct sequence. Check system mode, discharge cut-off SoC, and that the CT clamp is reading the correct circuit (grid, not generation).