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Control Board Diagnostics - Bosch 940 ESO Manual

940 eso - natural gas / 940 eso - liquefied petroleum (lp) gas
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11.6

Control board diagnostics

1. Press ON/OFF button
into ON.
2. Press and hold simultaneously buttons
seconds, until display reads P2.
3. Press
to enter P2 adjustment. The current setting will appear on
P
the display. If not, repeat process.
4. Press and release the
button on the control panel until the
P
display reads 'P4'. You are now in the diagnostic mode of the control
board.
5. When the display reads 'P4', press and release the
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.
P
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
information.
9. Press ON/OFF button to turn OFF the appliance and back ON again to
return heater to normal function.
Diagnostic menu
E
0d
Heat exchanger water temperature
1d
2d
Outlet water temperature (°F)
3d
4d
Bypass control monitor (°F) [0d - 2d]
5d
6d
7d
8d
9d
1F
2F
3F
4F
5F
6F
7F
8F
9F
10F
1P*
Appliance type - Cd (Condensing)
Appliance type - nC (Non condensing)
2P*
Appliance power - 175 / 199 (kBTU/hr)
Table 19 * Settings define from factory
940 ESO
+
,
and
for 3
P
+
button once
button. A
P
button again to
P
Entry/Exit into sub-modes
Inlet water temperature (°F)
Water flow (gallons/min)
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
9th most recent error
10th most recent error
Diagnostic menu
3P*
Temperature range - H (100-140°F)
Temperature range - C (100-184°F)
H0
H1
H2
Table 19 * Settings define from factory
11.6.1 Working hours
To see how many hours the appliance has worked, please enter the
"Diagnostic menu" (chapter 11.6);
▶ 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;
Working hours
Number in H0
Number in H1
______ (X 100) =
Number in H2
______ (X 10 000) =
(H0 + H1 + H2) = Total of hours
Table 20
Example:
Calculation of number of working hours,
Working hours
Number in H0
Number in H1
Number in H2
0 (X 10 000) =
(H0 + H1 + H2) = Total of hours
Table 21
Maintenance and service | 33
Numbers of hours - mode 0
Numbers of hours - mode 1
Numbers of hours - mode 2
______
_______ +
_______ +
_______
__________
60
60 +
5 (X 100) =
500 +
0
560
6 720 644 956 (2016/05)

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