Error Code List And Actions - Navien NCB-24LSWE Service Manual

5.2 Error Code List and Actions

Error Sub
Code Code
E001 0 Heat exchanger overheat
0 Ignition failure
E003
0 False flame detection
E004
0 Flame loss
E012
Heat exchanger overheat
0
E016
Exhaust overheat: exhaust limit switch stops the boiler
0 when the flue temperature exceeds 110 °C (230 °F) for more
E030
than 10 min.
2 Heat exchanger thermistor short error
E046
1 Exhaust thermistor open error
E047
2 Exhaust thermistor short error
1 Dual venturi limit switch error (ON)
2 Dual venturi limit switch error (Closed OFF)
E060
3 Dual venturi limit switch error (Open ON)
Version 1.0
Function Diagnosis/Actions
1. Clean the strainer.
2. Check voltage via PCB at the pump
3. (AC 230 V)
4. Check that the flow rate is correct
5. Check if water is circulating in the
heating lines.
6. Check the heat exchanger and flush
it with cleaning solution if
necessary.
1. Check the main gas supply
2. Check if the manual gas valve is
open.
3. 2. Check if the igniter is sparking.
4. 3. Tighten the ground terminals on
the heat exchanger.
1. Ensure that the ground wire is
connected.
2. Check if the igniter is sparking.
1. Check if the main gas valve is open
and verify the incoming gas
pressure.
2. Check the intake air filter.
3. Check the ground wire.
4. Check the power supply.
5. Tighten the ground terminals on
the heat exchanger.
6. Adjust the anti-short cycle time.
1. Turn OFF the boiler, wait at least 30
min, and then restart the boiler.
2. Clean the inlet water filter and
strainer.
3. Check the high limit switch and
PCB.
4. Check the 3-way valve.
5. Check the heat exchanger and flush
it if required.
1. Turn OFF the boiler, wait at least 30
min, and then restart the boiler.
2. Clean the strainer.
3. Check the heat exchanger and flush
it if required.
Check the heat exchanger thermistor
connection.
Check the exhaust thermistor
connection.
Check the dual venturi connection.
NCB Service Manual 79