Navien CH-180 Service manual - page 77
75
Error conditions and Symptoms Analysis
5.10. 09Error
Error
Description
The system checks the RPM signal after the blower starts to run, and displays the
error message 09E in the following cases:
1. If the RPM signal is 400 or lower at pre- purge, the system repeats pre-purge 10
times. If the RPM remains 400 or lower, the system determines RPM error, and
the boiler switches into Lock-Out (gas valve and ignition transformer locked).
(However, the air volume sen-sor should be normal.)
2. If the RPM signal of 400 or lower is detected for 3 seconds during combustion,
the system stops combustion, and the boiler switches into Lock-Out. (However,
the air volume sensor should be normal.)
3. If the pre-purge RPM signal of 400 or lower is detected, and the voltage of the air
vol-ume sensor is lower than the standard voltage (ignition voltage), the system
determines RPM error, and the boiler switches into Lock-Out.
1. Check if the blower works normally. If it does not work normally, check the power
supply to the blower (Black + Red, approx. DC 180V).
2. Replace the PCB if there is a problem in power supply.
3. If the trouble continues despite the checking of above items, replace the blower.
4. If RPM is significantly low while the blower works and the power supply is
normal, replace the blower.
5. If the blower connector is wet due to any reason including leakage, take the
corrective action.
6. Check for loose connection of white tower on PCB
09E
Fan Motor
RPM error
Check
items
©Navien America Inc. 2010
CH series service Manual
Version 1.0