Maintenance and service

Mode

Parameter

Values

 

 

 

01

Not used

----------

02

Not used

----------

03

Error code history

Displays the last 8 error codes. Use the hot water temperature selector

 

 

(right dial) to toggle from newest (left) to oldest (right) error codes.

 

 

 

04

Actual primary circuit

Displays the actual temperature in the primary circuit as detected by

 

temperature

the internal heating circuit sensor.

 

 

 

05

Selected primary circuit

Displays the recirculating water temperature (primary) as selected

 

temperature

by the user during normal operation.

06

Actual DHW temperature (only

Displays the actual temperature of the DHW tank as detected by

 

if 12kOhm thermistor used)

the 12kOhm external thermistor

 

 

 

07

Selected DHW temperature

Displays the hot water temperature as selected by the user during non-

 

(only if 12kOhm thermistor used)

diagnostic mode operation (only if 12kOhm external thermistor used).

 

 

 

08

Not used

----------

 

 

 

09

Pressure switch

00 - Open pressure switch - fan is off or there is no exhaust gas flow

 

 

01 - Closed pressure switch - fan is on or there is exhaust gas flow

 

 

 

 

 

 

10

Temperature limiter

01

- temperature is below the limit (180 F)

 

 

 

 

 

E9 - temperature is above the limit (180F)

 

 

 

11

Not used

----------

 

 

 

 

12

Gas valve

00

- gas valve closed

 

 

01

- gas valve open

 

 

 

 

 

 

13

Modulating gas valve

00

- gas valve closed

01-70 - gas valve position min/max

 

 

14

Thermostat

00

- thermostat open

01

- thermostat closed

 

 

15

Fan

00

- fan off

01

- fan on

 

 

16

Ionization

00

- no flame detected

 

 

01

- flame detected

 

 

 

 

 

17

Not Used

----------

 

 

 

18

Not Used

----------

 

 

 

19

Not Used

----------

 

 

 

20

Not Used

----------

 

 

 

21

Digital display test

All LCD components appear

22

Temperature unit selection

Use the hot water temperature selection knob to select temperature

 

 

units °C or °F.

 

 

 

 

Table 15

 

 

 

Parameter storage

BKeep pressing the reset button for at least 2 seconds in order to record adjustments. The digital

display blinks with the symbol .

Exiting service mode

BPress ON/OFF button to turn appliance OFF and then back ON again.

If the appliance is not powered off and

ithen back on again, it returns to normal working conditions after 5 minutes.

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Bosch Appliances GWH-345/450-ESR-N Maintenance and service Mode Parameter Values, Parameter storage, Exiting service mode

GWH-345/450-ESR-L, GWH-345/450-ESR-N specifications

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