33Error - Navien NP-180 Service Manual

5.17. 33Error

Error occurrence conditions and check items.
Error
33E
If an error (open: 248
Direct water
the system displays the 33E (cleared automatically) error message on the remote
temperature
sensor
controller and the PCB. The boiler maintains the Safety-Shutdown status.
short-circuit
1. Check if the hot water temperature sensor connector is wet due to any reason,
including leakage.
Check items
2. Replace the defected cold water temperature sensor.
3. Replace the PCB.
Check method
Error
Defective
temperature
sensor connector
Defective
sensor
Temperature
Defective
Other trouble
©Navien America Inc. 2010
or higher) in the cold water temperature sensor is detected,
Cause
Check if the hot water temperature sensor connector or the PCB
harness terminal is wet due to any reason, including leakage.
Measure the temperature sensor resistance.
Replace the sensor if it is 0 Ω.
sensor
If the trouble continues despite the checking of above items,
replace the PCB.
PCB
< Direct water temperature sensor / Blue 2P >
103
NR/NP series service Manual
Description
Check method
< Check the hot water temperature sensor >
Version 2.0