69
Error conditions and check items
5.5. 04Error
Error
04E
False-flame
detection
Check items
Description
1. Pre ignition false-flame
If a flame signal is detected before combustion (standby, prepurge, preignition),
a false-flame error 04E (automatically cancelled) is displayed on the indoor
thermostat, and the system performs continuous postpurge.
2. Post purge false-flame
If a flame signal is detected when the system performs post-purge as fuel
supply is stopped, a false-flame error 04E (automatically cancelled) is
displayed on the indoor thermostat, and the system performs continuous
postpurge.
1. Check if gas leaks due to defective sealing of the main gas valve.
2. Check if electricity is discharged from the electrode.
3. Check if gas is supplied at higher pressure than the standard gas pressure.
4. Defective PCB.
Is the flame detected
during no burner
operation?
Yes
No
Check the current of CN 19: 7 - 20μA
Check the voltage between two wires
of CN 19: 10-20VDC
Replace PCB
Clean or replace flame rod
©Navien America Inc. 2010CH series service Manual Version 1.0
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