Bosch C 950 - Control Board Diagnostics

Maintenance and service | 45
6 720 805 440 (2014/11)Greentherm
7.7 Control board diagnostics
1. Press ON/OFF button into ON.
2. Press and hold simultaneously buttons or and for 3
seconds, until display reads P2.
3. Press 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
board.
5. When the display reads 'P4', press and release the button once
again and the display should read 'E'.
6. Use the and button on the control board to cycle through
different diagnostic modes available.
7. Once in the selected diagnostic mode of your choice, press and
release the 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 button. A
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 button again to
return to the diagnostic mode menu and scroll to addition diagnostic
information.
9. Press ON/OFF button to turn OFF the appliance and back ON again to
return heater to normal function.
Program Description Factory Default MIN MAX Comment
C950ES C1050ES
C950ES/
C1050ES
C950ES C1050ES
P1 Maximum Power NG: 46,
LP: 46
NG: 51,
LP: 52
21 NG: 48,
LP: 48
NG: 53,
LP: 53
see chapter 4.14, page 36
note: reducing P1 values below maximum will
reduce maximum power of the appliance.
P2 Minimum Power NG: 10,
LP: 13
NG: 8,
LP: 11
20 see chapter 4.3.8, page 22
P3 Remote
Controls installed
_0 _0 6 see chapter 6.5, page 40
P4 Access to
Diagnostic Mode
E 0d 10f see chapter 7.7, page 45
P5 Cascade Mode NO NO CC contact Bosch for details
P6 Temperature Unit °F °F °C
P7 Gas type selection LP or NG Preset from factory.
Contact Bosch for details.
P8 Back light Not
Available
dE dE Not
Available
On dE turns back light off after 60 seconds from
last button pushed, ON turns backlight on
permanently.
P9 Fan Purge Runs secondary fan and primary fan when P9
is selected by depressing the “P” - button
PH Cascading type IC IC SC This menu is only available when cascade
mode is selected CC.
Contact Bosch Water Heating for details.
PC Primary/Secondary
mode
CS CS Cn
Table 49 Program values, factory default settings and ranges.
+
P
P
P
+
+
P
P
P
Diagnostic menu
E Entry/Exit into sub-modes
0d Heat exchanger water temperature
1d Inlet water temperature (°F)
2d Outlet water temperature (°F)
3d Water flow (gallons/min)
4d Bypass control monitor (°F) [0d - 2d]
5d Fan speed (Hz)
6d Burner power (%)
7d Maximum power (kW)
8d Back flow temperature (°C)
9d Exhaust temperature (°C)
1F Most recent error/failure
2F 2nd most recent error
3F 3rd most recent error
4F 4th most recent error
5F 5th most recent error
6F 6th most recent error
7F 7th most recent error
8F 8th most recent error
9F 9th most recent error
Table 50 * Settings define from factory