Bosch Tronic 3000T ES4 CA is a point-of-use electric mini-tank water heater identified in the manufacturer documentation. Bosch specifications list 4.0 US gal; 110–120 V, 1,440 W, 12 A; CA suffix. The front temperature dial and red heating lamp provide basic operating information, but the reviewed model-family manual does not establish a digital error-code display. For cold water at the faucet, first consider whether the stored supply was just depleted and whether the temperature selector is in its normal setting. Inspect only visible exterior water connections. Stop using the heater if it leaks, smells overheated, or trips protection repeatedly; internal electrical or pressure-device repairs require a qualified professional. This CA-suffix variant requires regional market confirmation before publication.
Bosch Tronic 3000T ES4 CA electric mini-tank water heater ES4 CA Error Codes
No manufacturer-confirmed error symbols are currently recorded for this exact model. This does not prove that the appliance cannot display a code or warning.
No verified code list available. Use the matching model manual or manufacturer support for unexplained display messages.
The directory currently provides no verified error-code table for this model. Check the official model manual and symptom advice; do not apply generic codes from another appliance.
Safe checks for common problems
- No hot water: verify the front dial is not at OFF and check accessible external power supply without removing a cover; allow time for reheating after use.
- Water too cool or too hot: review the temperature control described by Bosch and test delivered water carefully; scalding is possible.
- Red lamp is off: this is a heating-status indicator, not a fault code; report persistent no-heat conditions to Bosch service.
- Leaks or relief discharge: stop use, isolate supply when safe and contact a plumber; never cap or block the relief valve.
What the warning indicator means
- The manual describes a red heating-element indicator, a mechanical thermostat and a high-limit safety cut-out. It supplies no verified alphanumeric error-code mapping for this exact model.
- An internal high-limit reset requires access to electrical components; this page does not instruct owners to open the cover or bypass safety systems.
Preparation for service
- Write down the entire ES4 CA model designation, serial/rating-label details, whether the red lamp lights and whether water is leaking.
- The ES4 is a 4-gallon storage appliance; it does not produce unlimited hot water.
Official sources
Read the matching Bosch operating manual, the manufacturer model documentation and manufacturer troubleshooting/support information. The CA-marked model documentation does not independently establish distribution in the United States; verify market and installation nameplate.
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