Navien NCB-180, Руководство по обслуживанию

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Check method
Fault Possible Causes Check method
Water is not
Refilled
Cold water valve is
closed or frozen
Turn on cold water tap and check if the valve works or is frozen.
Water is not
refilled
Defective auto feeder
valve
1. Check the auto feeder valve filter if water is not refilled.
2. Check the power supply (DC 24V).

Replace the auto feeder valve if power is supplied normally.
3. Replace the PCB if power is not supplied.
<Check if the filter is clogged with debris>
Water flow over
through the
condensed water
hose.
Drain valve open
Check the drain valve under the left of the main heat exchanger.
Defective heat
exchanger
Water leaks through the condensed water hose due to a defective heat exchanger.
Frequent 351E Pipe leaks
Frequent water filling can occur due to leakage of pipe. Check the leakage on the
pipe connector and distributor.