Navien CH-180 Service manual - page 62
60
Check method
Failure
mode
Cause
Check method
Turn on cold water tap and check if the valve works or is frozen.
Water is not
refilled.
Cold water
valve is
closed or
frozen
Defective
auto feeder
valve
Defective
heat
exchanger
Pipe leaks
Frequent
02E
Drain valve
open
Water is not
refilled.
Water flow
over
through the
condensed
water hose.
1. Check the auto feeder valve filter if water is not refilled.
2. Check the power supply (AC 120V).
Replace the auto feeder valve if power is supplied normally.
1. Replace the PCB if power is not supplied.
Water leaks through the condensed water hose due to a defective
heat exchanger.
Frequent water filling can occur due to leakage of pipe. Check the
leakage on the pipe connector and distributor. Check if the water
level becomes lower through the expansion tank, and give the
explanation to the customer. (28E)
Check the drain valve under the left of the main heat exchanger.
terminal in purple> clogged with debris> G ©Navien America Inc. 2010 CH series service Manual Version 1.0