Navien NCB-24LSWE, Руководство по обслуживанию, Страница: 102 / 144

100 NCB Service Manual Version 1.0
Testing method
Fault Possible causes Testing method
Dual venturi
action error
Defective dual
venturi cable or
harness
1. Disconnect all cables from the dual venturi.
2. Use a multi-meter to test the dual venturi’s electrical wiring.
Dual venturi not
operating
1. Turn off the power to the boiler at the main power switch (not the front panel
power button) and wait for 10 sec.
2. Turn on the power.
3. Wait until Fan Auto Adjusting is complete.
4. Enter the dual venturi test mode and perform a test.
1) Repeat the test at least twice. Turning the unit ON and OFF once is one test
cycle. ON
→
OFF
→
ON
→
OFF
→
is the minimum sequence.
2) Confirm that the dual venturi is operating correctly.
a. Listen to the dual venturi while it is running and check for operational
noise (an audible click is heard at boiler ON and boiler OFF).
b. If operational noise cannot be heard because of ambient noise,
disassemble the dual venturi and perform a visual inspection.
5. If error message ‘E060’ is displayed, replace the dual venturi.
6. If a dual venturi error does not occur, replace the APS.