Diagnostic Menu - Bosch 940 ES Installation Manual

6.6

Diagnostic menu

1. Turn on/off switch on water heater to off (O) position.
B Press and hold the program '
turning the on/off switch to the on (I) position. The
display will cycle through a startup procedure
including the software version.
B Release the '
' button when '188' appears on the
display. The display should read 'P2' when the
program button is released. If not, repeat process.
B Press and release the '
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 '
to cycle through different diagnostic modes
available.
B Once in the selected diagnostic mode of your
choice, press and release the '
the diagnostic information.
B 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.
B Once the information is obtained, press the '
button again to return to the diagnostic mode menu
and scroll to addition diagnostic information.
B To exit the diagnostic mode of the heater, use the
' ' or ' ' button until the display reads 'E'.
B Press the '
' button once again and the display
should read P4.
2. Turn the on/off switch off (O) and back on (I) again to
return heater to normal function.
Diagnostic menu
E Entry/Exit into sub-modes
0d Set-point temperature
1d Inlet water temperature (°F)
2d Outlet water temperature (°F)
3d Water flow (gallons/min)
4d Gas type (LP or NG)
5d Fan speed (Hz)
6d Burner power (%)
7d Maximum power (kW)
8d Back flow temperature (°C)
9d Not used, setting 00
Table 28 * Settings define from factory
6 720 644 930
' button while
' button on the control
' button on the control board
' button to display
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
10F 10th most recent error
1P* Appliance type - Cd (Condensing)
Appliance type - nC (Non condensing)
2P* Appliance power - 175 / 199 (kBTU)
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
Table 28 * Settings define from factory
6.6.1 Working hours
To see how many hours the appliance has worked,
please enter the "Diagnostic menu" (chapter 6.6);
'
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, intro-
duce the values in the table below;
Working hours
Number in H0
Number in H1
Number in H2
(H0 + H1 + H2) = Total of hours
Table 29
Example:
Calculation of number of working hours,
Working hours
Number in H0
Number in H1
Number in H2
(H0 + H1 + H2) = Total of hours
Table 30
Maintenance and service
_______ +
______
_______ +
______ (X 100) =
_______ +
______ (X 10 000) =
_________
60
5 (X 100) = 500
0 (X 10 000) =
560
60 +
+
+
0
43