Bosch PROTANKLESS GWH 345/450 ESR User Manual
Page 31
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Maintenance and service
31
Parameter storage
B Keep pressing the reset button
for at least 2
seconds in order to record adjustments. The digital
display blinks with the symbol
.
Exiting service mode
B Press ON/OFF button to turn appliance OFF and
then back ON again.
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
temperature
Displays the actual temperature in the primary circuit as detected by
the internal heating circuit sensor.
05
Selected primary circuit
temperature
Displays the recirculating water temperature (primary) as selected
by the user during normal operation.
06
Actual DHW temperature (only
if 12kOhm thermistor used)
Displays the actual temperature of the DHW tank as detected by
the 12kOhm external thermistor
07
Selected DHW temperature
(only if 12kOhm thermistor used)
Displays the hot water temperature as selected by the user during non-
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
i
If the appliance is not powered off and
then back on again, it returns to normal
working conditions after 5 minutes.