Brand guide
All Bosch water heater guides
Choose the symptom or code that matches your unit. Confirm the exact model and control generation against the rating plate before following model-specific instructions.
No hot water
Bosch Powerstar Tankless Troubleshooting
A Bosch Powerstar tankless not heating may have a dead 240 V leg, low flow, a stuck flow sensor, a tripped thermal cutout, or reversed lines.
Leaks and floodingBosch Water Heater Troubleshooting
Bosch troubleshooting for Therm and Greentherm tankless, AquaStar, Powerstar electric, and Tronic mini-tanks. Codes, flow, power, and leaks.