Reparación y recambios

HydroCommander is built so that you can replace the parts outside the device yourself — push-fit, no tools. Whatever sits inside the device, we repair for you — free of charge under the legal guarantee, after that based on a cost estimate. For some parts inside the device, such as a pump, we can send you the spare part with instructions if you prefer.

Spare parts

Part	Price	How
Soil moisture sensor with cable and USB-C plug	expected around €35	Manual p. 48 “Replacing or re-plugging a sensor”: plug in the new sensor, then Settings → Sensors → Assign sensors
Water distributor (with lid)	€6.99	Manual pp. 38 and 44
Silicone hose, 6 mm inside, 9 mm outside	€1.00 per meter	Manual p. 38; recalibrate the zone after shortening or extending (p. 43)
Drip hose 4 mm	€1.50 per meter	App guide “A whole bed”
Y-splitter 6 mm · Y-splitter 6 to 4 mm	€1.00 each	App guides “Several identical plants”, “A whole bed”
Clips	€1.50 per 10	Manual p. 38
Suction filter	expected €1.50	Manual pp. 37 and 49
Check valve	expected €2.00	Manual p. 37 — the arrow points away from the filter toward the device
USB-C extension 2 m · 5 m	€3.99 · €9.99	between sensor cable and sensor socket
Plug-in power supply 12 V	expected around €13	for safety reasons, use only this power supply (manual pp. 31 and 34)
Diaphragm pump	expected around €5	only from us, after consultation, with replacement instructions

All prices are final prices, plus shipping (stemp-systems.de/en/versand). The prices in the table are estimated costs as of 21 October 2026; the price we quote when you order applies.

Availability: You can buy the spare parts listed above from us for at least five years from delivery of your device, and for devices from the Kickstarter campaign at least until December 2032. If a part is no longer available, you receive an equivalent part that fits and does the same job.

Ordering: Email us at support@stemp-systems.de with the part, the quantity and the delivery address. We reply with the price including shipping; once you confirm and pay, we send the part. Campaign backers can also add spare parts in the pledge manager until shipping. Once the shop on hydrocommander.com opens, the parts are available there too.

Hoses, Y-splitters and clips from other manufacturers also fit if they have the same dimensions (hose 6 mm inside, 9 mm outside). After replacing them, check the push-fit connections during a test run.

Repairs by us

1. Email us at support@stemp-systems.de: model and serial number (rating label on the underside of the device), what happened and since when. The messages from the event list and photos help.
2. Often a part from the outside or a setting solves it — then we send you the part or the instructions. For parts inside the device, such as a pump, you can get the spare part with replacement instructions. If you don’t want to or can’t do it yourself, we repair the device here.
3. If the device has to come to us, we send you a shipping label. Before sending, empty and dry the device, export your data in the app (“Stats” → “Export CSV”) and reset it with Settings → System settings → Factory reset if the fault allows it; this deletes settings, history and Wi-Fi credentials. If we need them to find the fault, we use them for that purpose only. Send only the device; send the power supply and sensors only if we ask for them.
4. Within the legal guarantee (two years from delivery) we repair or replace free of charge and also pay for shipping. You can choose whether we repair or replace. If we remedy a defect by repair, the limitation period for your claims is extended once by twelve months.
5. After that, you first receive a free cost estimate; we only repair once you agree. If you decline, we return the device for the shipping costs or dispose of it free of charge.
6. If we find no fault, we settle the shipping costs with you case by case; if the device has a defect, we bear all costs.

Instructions

• Manual (comes with every device, PDF at hydrocommander.com/en/anleitung): replacing a sensor (p. 48), cleaning, care and winter storage (p. 49), messages and troubleshooting (pp. 50–51).
• App guides in the HydroCommander app, among them “Maintenance mode”, “Winter break and storage”, “Understanding & checking sensors”, “Sensor error (NIO)” and “Firmware update (OTA)”.
• Instructions for replacing parts inside the device come with the spare part.

Repair restrictions

Your statutory rights in the event of defects remain unaffected in all cases.

• Open the device only following our instructions and only with the power supply unplugged — water and electronics sit close together inside. You keep your rights for a defect the device had on delivery; damage caused only by opening or modifying the device, however, is not a defect.
• We replace the circuit board, the display and the water distributor block inside the device here.
• Do not open or repair the power supply. If it is damaged, replace it with the original replacement power supply — for safety reasons, do not use any other power supply (manual p. 31).
• Changes to the firmware beyond the settings and updates are not intended. Your rights under the open-source licenses of the firmware remain unaffected (Terms § 12a(3)).