Bosch C1210ESC Technical Service Bulletin

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Technical Service Bulletin:Descaling the Heat ExchangerModels: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ESIntroduction Periodic descaling may be necessary in areas where the watersupply is highly mineralized. Scale build up in the heatexchanger may result in reduced flow rates, error codes and boil-ing sounds in the heat exchanger.Tools needed: Various plumbing wrenches 5 gallon bucket for descaling solution Small circulator or pump 3 Hoses for circulating Filter for descaling solutionDescaling procedure1. Clear error code (if displayed) by pressing the reset button.2. Press On/Off button to "Off".3. Disconnect electrical supply from the water heater.4. Shut off the water supply to the water heater using (installersupplied) isolation or shutoff valves.5. Open hot water taps to drain and relieve pressure from theplumbing system.6. Drain water by disconnecting the inlet and outlet water connec-tions from the heater.7. Connect a hose (A) from the outlet of the circulating pump(installer supplied) to the inlet water fitting on the water heater.(Fig. 1)8. Connect another hose (B) to the water outlet fitting on the waterheater. Route the other end of this hose into a descaling reser-voior or bucket. (Fig. 1)9. Using a 3rd hose (C) from the descaling reservoir, connect to theinlet side of the circulator/pump. Install a filter on the end ofthe hose in the descaling reservoir. (Fig. 1)Figure 110. Make sure all connections are 'hand tight'.11. Fill reservoir/bucket with descaling solution so both hoses insideare submersed. We recommend straight white vinegar. If usinga commercial descalant, refer to manufacturer‘s instructions forproper dilution ratio with water.12. Operate the circulating pump.13. Make sure there are no leaks and the solution is flowing from thedescaling reservoir, through the heater and returning to thereservoir.

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