Maintenance and service

5.5Control board diagnostics

1.Turn on/off switch on water heater to off (O) position.

2.Press and hold the program ( ) button while turning the on/off switch to the on (I) position. The display will cycle through a startup procedure including the software version.

3.Release the ' ' button when '188' appears on the display. The display should read 'P2' when the program button is released. If not, repeat process.

BPress and release the ' ' button on the control panel until the display reads 'P4'. You are now in the diagnostic mode of the control board.

4.When the display reads 'P4', press and release the

' ' button once again and the display should read 'E'.

BUse the ' ' and ' ' button on the control board to cycle through different diagnostic modes available.

5.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.

6.Once the information is obtained, press the ' ' button again to return to the diagnostic mode menu and scroll to addition diagnostic information.

BTo exit the diagnostic mode of the heater, use the

' ' or ' ' button until the display reads 'E'.

7.Press the ' ' button once again and the display should read P4.

8.Turn the on/off switch off (O) and back on (I) again to return heater to normal function.

Diagnostic menu

EEntry/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

PWM cycle (signal to fan)

9d

Appliance selection

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

Table 11

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Bosch Appliances 2400E NG, 2400E LP manual Control board diagnostics, Diagnostic menu

2400E NG, 2400E LP specifications

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