Navien CH-180 Installation Manual page 56

5.2 Slave unit set-up
This procedure is same as the 3.2 Slave set-up of Step 3: Communication set-up.
After the slave set-up, each FND1 will display on the PCB as below:
5.3 Set-up finish
After the slave set-up, DIP SW1 and DIP SW2 should be set to the original position and push
and hold the Tack SW3 and Tack SW4 of the master unit simultaneously for 3 seconds.
All the FND's will display the setting temperature and set-up procedures are finished.
6. Error display
In case of the error condition in the cascade system, a relevant error and unit are displayed on the
remote controller.
If a master unit is in DHW operation mode, instead of slave error code, the hot water temperature of
the master unit is displayed.
Error display example:
1) Error code 35 of the master unit
2) Error code 35 of the slave 1 unit
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