Maintenance and service
Mode | Parameter | Values | ||
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01 | Not used | |||
02 | Not used | |||
03 | Error code history | Displays the last 8 error codes. Use the hot water temperature selector | ||
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| (right dial) to toggle from newest (left) to oldest (right) error codes. | ||
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04 | Actual primary circuit | Displays the actual temperature in the primary circuit as detected by | ||
| temperature | the internal heating circuit sensor. | ||
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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 | ||
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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). | ||
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08 | Not used | |||
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09 | Pressure switch | 00 - Open pressure switch - fan is off or there is no exhaust gas flow | ||
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01 - Closed pressure switch - fan is on or there is exhaust gas flow | ||||
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10 | Temperature limiter | 01 | - temperature is below the limit (180 F) | |
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| E9 - temperature is above the limit (180F) | ||
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11 | Not used | |||
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12 | Gas valve | 00 | - gas valve closed | |
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01 | - gas valve open | |||
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13 | Modulating gas valve | 00 | - gas valve closed | |
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14 | Thermostat | 00 | - thermostat open | |
01 | - thermostat closed | |||
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15 | Fan | 00 | - fan off | |
01 | - fan on | |||
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16 | Ionization | 00 | - no flame detected | |
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01 | - flame detected | |||
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17 | Not Used | |||
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18 | Not Used | |||
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19 | Not Used | |||
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20 | Not Used | |||
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21 | Digital display test | All LCD components appear | ||
22 | Temperature unit selection | Use the hot water temperature selection knob to select temperature | ||
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| units °C or °F. | ||
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Table 15 |
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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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