Gas type selection
Table 34 Program values, factory default settings and ranges.
Control board diagnostics
1. Press ON/OFF button
2. Press and hold simultaneously buttons
seconds, until display reads P2.
to enter P2 adjustment. The current setting will appear on
the display. If not, repeat process.
4. Press and release the
button on the control panel until the
display reads 'P4'. You are now in the diagnostic mode of the control
5. When the display reads 'P4', press and release the
again and the display should read 'E'.
6. Use the
button on the control board to cycle through
different diagnostic modes available.
7. Once in the selected diagnostic mode of your choice, press and
button to display the diagnostic information.
EXAMPLE: to read the flow rate in gallons per minute while the unit is
flowing water, cycle to the '3d' mode and press the
reading of 25 on the display would indicate the heater is reading a flow
rate of 2.5 gallons/minute.
8. Once the information is obtained, press the
return to the diagnostic mode menu and scroll to addition diagnostic
9. Press ON/OFF button to turn OFF the appliance and back ON again to
return heater to normal function.
C 1210 ES/ESC
H: C 1210 ES
C: C 1210 ESC
LP or NG
button again to
This values are set from factory they cannot be
see chapter 4.14, page 31
note: reducing P1 values below maximum will
reduce maximum power of the appliance.
see chapter 4.3.7, page 21
see chapter 6.5, page 34
see chapter 7.7, page 39
contact Bosch for details
Preset from factory.
Contact Bosch for details.
dE turns back light off after 60 seconds from last
button pushed, ON turns backlight on
Runs secondary fan and primary fan when P9 is
selected by depressing the "P" - button
This menu is only available when cascade mode is
Contact Bosch Water Heating for details.
Entry/Exit into sub-modes
Heat exchanger water temperature
Inlet water temperature (°F)
Outlet water temperature (°F)
Water flow (gallons/min)
Bypass control monitor (°F) [0d - 2d]
Fan speed (Hz)
Burner power (%)
Maximum power (kW)
Back flow temperature (°C)
Exhaust temperature (°C)
Most recent error/failure
2nd most recent error
3rd most recent error
4th most recent error
5th most recent error
6th most recent error
7th most recent error
8th most recent error
Table 35 * Settings define from factory
Maintenance and service | 39
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