Bosch C 950 - Control Board Diagnostics

Maintenance and service
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
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7.7 Control board diagnostics
1. Press ON/OFF button into ON.
2. Press and hold simultaneously buttons , 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.
Table 50 * Settings define from factory
7.7.1 Working hours
To see how many hours the appliance has worked, please enter
the “Diagnostic menu” (chapter 7.7);
▶ Select the sub-mode “H0”.
Write the number that shows in the display.
▶ Select the sub-mode “H1”.
Write the number that shows in the display.
▶ Select the sub-mode “H2”.
Write the number that shows in the display.
After checking the sub-modes H0, H1 and H2, introduce the
values in the table below;
Table 51
Example:
Calculation of number of working hours,
Table 52
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
+
P
P
P
+
+
P
P
P
P
10F 10th most recent error
1P* Appliance type - Cd (Condensing)
Appliance type - nC (Non condensing)
2P* Appliance power - 175 / 199 (kBTU/hr)
3P* Temperature range - H (100-140°F)
Temperature range - C (100-184°F)
H0 Numbers of hours - mode 0
H1 Numbers of hours - mode 1
H2 Numbers of hours - mode 2
C0 Number of cycles - mode 0
C1 Number of cycles - mode 1
C2 Number of cycles - mode 2
Working hours
Number in H0 ______ _______ +
Number in H1 ______ (X 100) = _______ +
Number in H2 ______ (X 10 000) = _______
(H0 + H1 + H2) = Total of hours __________
Working hours
Number in H0 60 60 +
Number in H1 5 (X 100) = 500 +
Number in H2 0 (X 10 000) = 0
(H0 + H1 + H2) = Total of hours 560
Diagnostic menu