Navien CH-180 Service manual - page 113
111
Error type
Cause
Check method
Remark
The circuit breaker operates immediately as soon as
the power cord is plugged in the receptacle.
Check the sheath of power cord, or if there is
short-circuit.
Check the devices in the order of the power trans-
former and the PCB.
If the circuit breaker operates after a repairing work,
check the wiring of each part.
Mind the direction when assembling the ignition trans-
former.
Be careful that wire is not pressed down when assem-
bling the main gas valve.
Check if the wire is fixed and well adjusted on the main
side of the heat exchanger.
If circuit breaker operates during the operation of the
boiler, check the order of operation, and replace the
concerned part.
e.g., The circuit breaker operates at switchover to
burner stage 3 after ignition.
ĶReplace the gas
manifold valve.
Check the power supply to the remote controller
terminal. (DC 19V or higher)
If there is a problem in power supply, check the output
voltage of the PCB, and take the action separately for
wiring error and defective PCB, respectively.
If the power supply is normal, replace the remote
controller.
Circuit
breaker
operation
Power
supply
Defective
part assem-
bly
Circuit
breaker
operates while
the boiler is
running
Check the
wire
Remote
controller
power
©Navien America Inc. 2010
CH series service Manual
Version 1.0