The Complete Guide To Hoymiles Microinverter Error Codes

Short events the micro logs when the mains voltage spikes (11) or sags (12), or the frequency (13) or phase (14) jumps, with 15 a general transient. They come from the network and nothing is wrong with your system. The names come from the S-Miles installer app's alarm list as decoded by the open-source community, not a Hoymiles manual, so treat the wording as approximate. If production drops with them most days, an electrician can check.

Not faults. 71 means the micro is deliberately reducing output because the grid voltage is high (the volt-watt response Australian micros must apply under AS/NZS 4777.2), 72 because the frequency is high, and 73 because it is hot (around 80 degrees C), with full output back as it cools. The names come from the S-Miles installer app via the open-source community, not a manual. A 71 most afternoons is lost production worth chasing with the network.

The grid profile (the country settings that tell the micro what voltage and frequency limits to use) is wrong or did not load properly. Hoymiles' fix is to check the grid configuration and send it again, which the installer does remotely from S-Miles Cloud; the micro may not produce until it is done. In Australia the profile should be the AS/NZS 4777.2 one for your network.

The mains voltage at the micro went above the limit in its grid profile, so it stopped until it dropped back; 142 is the same measured as a 10-minute average, usually sustained high voltage on sunny afternoons. Hoymiles says an occasional one recovers by itself; if frequent, check the grid voltage with the power operator or have the limit adjusted with their consent. An electrician measures your own cable's voltage rise first.

The mains voltage at the micro dropped below the limit in its grid profile and it stopped until the voltage came back. Hoymiles says an occasional one recovers on its own; if it is frequent, check the grid voltage range with the power operator, and if the fault stays, check the AC switch and AC wiring. Every micro at once is the supply; one trunk or one micro is its breaker, connector or cable.

The mains frequency at the micro went above the limit (144), below it (145) or changed too quickly (146), and the micro paused until it was steady. This comes from the network, not your system; Hoymiles says an occasional one recovers by itself and a frequent one is for the power operator. A generator or changeover switch on the house supply can also cause it.

The micro cannot see the mains, so it has stopped, which is what it must do in a blackout. Hoymiles' notes are short: for 147 check whether there is a power outage; for 148 check the AC switch and AC wiring. The whole system showing it is a blackout or the solar breaker off; one trunk showing it is that trunk's breaker, end cable or a connector.

The micro's anti-islanding protection tripped: it decided the grid had gone or was too unstable to feed into and shut off, which is the safety behaviour the standard requires. Hoymiles says an occasional one recovers on its own; if it shows frequently on every micro, the power operator should check for an island on the supply, and if it persists, support.

On the three-phase HMT micros, alarm 171 means the voltage difference between phases is abnormal, which Hoymiles says is usually caused by the phases being wired wrongly. It is an installation wiring fault at the AC trunk or switchboard, and the micro will not run properly until an electrician corrects it. It normally shows on every micro on that trunk.

The three-phase HMT micro reports that its neutral is not properly connected to the grid neutral. Hoymiles says to confirm the micros' neutral lines are connected to the neutral of the grid correctly. It is a wiring fault at the AC trunk or switchboard that an electrician must fix before the micros can run safely; it normally shows on every micro on that trunk.

S-Miles Cloud flags the plant with Alarm or Grid Abnormality when more than half the micros report grid alarms at once (grid over voltage, under voltage or fluctuation). That comes from the supply, not the panels; the micros pause and come back on their own. If it shows most sunny afternoons the street voltage or your own cable run is high, which an electrician can measure and report.

A fast red flash every half second means a fault other than the grid (the HMS manual says invalid AC grid or hardware failure), and a solid red light means a hardware failure. The exact alarm is on the platform. That micro is off and only its panel or panels are affected; it is a roof job and usually a warranty replacement, never something to touch yourself.

A red flash every second means the micro is not producing because the AC grid is invalid: voltage or frequency out of range, or no grid at all. Hoymiles' FAQ says a flashing red light may point to a grid voltage problem and to contact your installer. Every micro red is a blackout, a tripped solar breaker or the street voltage; one trunk red is its breaker, end cable or a connector.

The panel on that input is putting out more voltage than the micro is rated for (65 V on the HM and HMS series), so the micro will not run it. Hoymiles' step is to make sure the panel's open-circuit voltage is at or below the maximum input; if it is, support looks at the micro. It usually means an unmatched panel was fitted and an electrician needs to check the pairing. Only that input is affected.

The voltage from the panel on that input is below the micro's operating range (the HM and HMS start at 22 V), so that input is not running. Every micro logging it at dawn, dusk or in heavy cloud is normal and it often appears at the end of each day. One input showing it in full sun while its neighbours run points to that panel, plug or lead, a roof job. The manual only says to check the panel voltage, then contact support.

The micro sees nothing on that DC port. Hoymiles' steps are to confirm a panel is connected to the port and, if so, check the DC cable to the panel. A port never wired because the micro has more ports than panels is normal and the installer can mark it unused; a port that should have a panel points to an unplugged or damaged lead or a dead panel, which is a roof job.

The panels on ports 1 and 2 (or 3 and 4, or 5 and 6) are wired to the micro incorrectly, for example the positive from one panel and the negative from another on the same port, or a reversed lead. Hoymiles' step is to check the DC connections on those two ports. It is an installation fault and an electrician has to correct it on the roof; only that micro is affected. Wiring faults need an electrician, so we treat them as a call.

A green flash every second means the micro is producing power normally. Five quick green flashes when it first gets DC in the morning is a successful start-up. Nothing to do; if the app shows that panel offline, it is the data link to the DTU, not the micro.

A green flash every 2 seconds means the micro is producing but one of its DC inputs is abnormal: a panel, plug or lead on one port, or simply a port with no panel on it. The other panel or panels on that micro keep producing. If the port should have a working panel, checking it is a roof job.

The micro has been switched off by a command, not by a fault: Hoymiles says to check the zero export (export limit) setting and whether the micros were shut down manually from the platform. Installers sometimes do this while a system waits for network approval. Ask whoever installed it; they can switch it back on remotely.

Internal software errors inside the micro (129 is labelled 'Abnormal bias' on the HMS series). Hoymiles says that if one appears occasionally and the micro keeps working, no action is needed; if it keeps coming back or the micro does not recover, the dealer or Hoymiles support replaces it under warranty. Only that panel is affected. Internal and hardware faults need testing with the right instruments, so we treat them as a call.

The micro's firmware is wrong or corrupted; its light flashes red and green alternately. Hoymiles' fix is to check the firmware and upgrade it again, which the installer pushes through the DTU from S-Miles Cloud, after checking the DTU is talking to both the cloud and the micro. If the upgrade will not take, the micro is replaced under warranty. Only that panel is affected.

Alarm 130 Offline means the DTU cannot hear from that micro while the DTU itself is online. Hoymiles' steps are to confirm the micro is working from its LED, that its serial number matches the platform, and that the radio link is good. One panel offline is usually range, a metal roof in the way or no daylight; every panel offline is the DTU or a serial number mix-up. Still offline after a day or two of sun is a roof job.

The DTU-Pro and DTU-Pro-S have four lights: RUN, Cloud, MI and ALM. ALM means an alarm has been logged (DTU, micro or meter) and the platform's alarm page says which and gives Hoymiles' suggested fix. Cloud shows the internet state (disconnected, connected but not reaching the server, or communicating); MI shows whether the micros are talking and all serial numbers are loaded. Production is usually unaffected.

The micro is powered by its panels, so no light means no DC: at night, dawn, dusk or in heavy cloud that is normal. Hoymiles says if the light stays off to check the DC connection, and if that and the input voltage are normal, contact the dealer, meaning a failed micro. Five quick red flashes when DC is first connected means a failed start-up. In full sun either is a roof job.

S-Miles Cloud marks the whole plant Offline when the DTU gateway is not connected to the internet; the panels keep producing, the app just stops updating. Hoymiles' own checklist is the wifi password in the DTU, whether the wifi works, and weak signal. 'Network signal instability' is the milder version and 'Inactive' means no data for over half a year; both clear once the DTU is back online.

S-Miles Cloud raises this when a micro's serial number on the plant is wrong or already belongs to another plant, and every micro then shows offline. Hoymiles says it comes from the plant being created before the DTU wifi was set up, a serial number typed wrongly, or devices replaced, added or deleted. The installer fixes it remotely (DTU Networking) and the micros return within about 15 minutes.

The micro has shut itself down because it is too hot and will start again once it cools. Hoymiles' steps are to check the ventilation and ambient temperature where it is mounted; it is meant to sit in the shade under the panel with clear space around it. One micro doing this on ordinary days when its neighbours do not usually has an airflow problem or is failing, and that is a roof job. Heat shutdowns point at a failing fan, a blocked vent or a bad installation spot, so we treat them as a call.

An internal hardware fault inside that micro; on the HMS series the light goes solid red for a hardware failure. Hoymiles says a one-off that clears while the micro keeps producing needs no action, but one that repeats or does not recover goes to the dealer or Hoymiles support, which in practice means a warranty replacement. The micro cannot be repaired on site. Only that panel is affected.