Circuit Breaker Operates - Navien NP-180 Service Manual

5.27.3. Circuit breaker operation
Error
Power supply
Defective part
assembly
Circuit breaker
operates
Circuit breaker
operates while
the boiler is
running
Remote controller
Check the wire
power
©Navien America Inc. 2010
Cause
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 transformer 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 transformer.
Be careful that wire is not pressed down when assembling the
main gas valve.
Check if the wire is fixed and well adjusted on the main side of the
heat exchanger.
<Normal assembly> <Short-circuit due to defective
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.
Replace the 3-stage valve.
Check the power supply to the remote controller terminal.
(DC 19 V 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.
127
NR/NP series service Manual
Check method
<Wiring near the heat ex-changer>
assembly>
Version 2.0