Point-of-Use Water Heaters error codes, explained

Under-sink units (Bosch, InSinkErator, Rheem). Codes below: Reset and replacement guides. Each guide covers what the code means, what you can safely try yourself, when to stop and call a technician, and what the repair typically costs.

No hot water at the breakroom sink (point-of-use heaters)

That under-sink mini water heater has a documented check order: power first (many are plug-in — test the outlet with a lamp; others have a breaker), then the high-limit reset — on standard electric units a red button behind the access panel, and on mini-tanks like the Bosch a small recessed button in the middle of the thermostat, pressed with a pen. A tripped high-limit restores hot water instantly and 'solves a surprising percentage of no-hot-water service calls.' The rule that matters: if it trips again, stop resetting — a repeat trip means a failing thermostat or element.

DIY fix — no technician needed