Control Board Diagnostics; Fan Speed Adjustment - Bosch Therm 8000 S GWHC 27 CTDE Installation And Operating Instructions Manual

8.5 Control board diagnostics

To acess the diagnostic menu, proceed as follow:
B Press ON/OFF button to turn o the appliance.
B Press and hold "Program"
button to turn appliance ON.
B Release the button when '188
The display should read 'P2' when the program button is
released. If not, repeat process.
B 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.
B When the display reads 'P4', press and release the
button once again and the display should read 'E.
B Use the and button on the control board to cycle
through di erent diagnostic modes available.
B Once in the selected diagnostic mode of your choice, press
and release the button to display the diagnostic
information.
Example: to read the ow rate in liters per minute while the unit
is owing water, cycle to the '3d' mode and press the
button. A reading of 25 on the di splay would indicate the heater
is reading a ow rate of 2.5 liters/minute.
Once the information is obtained,
B Press the button again to return to the diagnostic
mode menu.
B Press or buttons until the letter "E" appears on
the display, to leave the diagnostic menu.
B Press button and in the display appear 'P4'.
B Press ON/OFF button to turn o the appliance.
B Press ON/OFF button to turn ON the appliance.
Heater is ready for normal operation.
Diagnostic menu
E Entry/Exit into sub-modes
0d Set-point temperature (ºC)
1d Inlet water temperature (ºC)
2d Outlet water temperature (ºC)
3d Water ow (gallons/min) (l/min)
4d Gas type (LP or NG)
5d Fan speed (Hz)
6d Burner power (%)
7d Maximum power (kW)
8d Back ow temperature (ºC)
9d Exhaust temperature (ºC)
1F Most recent error/failure
2F 2nd most recent error
Table 14
Therm 8000 S
Diagnostic menu
3F
4F
button and press ON/OFF
5F
6F
' appears on the display.
7F
8F
9F
10F
H0
H1
H2
Table 14
1) Only available condensing models
8.5.1 Working hours
To see how many hours the appliance has worked, please enter
the "Diagnostic menu";
B Select the sub-mode "H0".
Write the number that shows in the display.
B Select the sub-mode "H1".
Write the number that shows in the display.
B 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;
Working hours
Number in H0
Number in H1
Number in H2
(H0 + H1 + H2) = Total of hours
Table 15

8.6 Fan speed adjustment

1)
Before adjusting the fan speed it
admission / exhaustion system, calculating the total lenght of
the exhaust pipes and quantity of elbows.
Installation instructions | 33
3rd most recent error
4th most recent error
5th most recent error
6th most recent error
7th most recent error
8th most recent error
9th most recent error
10th most recent error
Numbers of hours - mode 0
Numbers of hours - mode 1
Numbers of hours - mode 2
______ _______ +
______ (X 100) = _______ +
______ (X 10 000) = _______ +
__________
After installing the appliance, the minimum
power fan speed must be adjusted to
compensate for variation in vent pipe length.
is necessary to verify the
6 720 680 174 (2012/09)