Navien CH-180, User'S Operation Manual

Page: 8 / 52

Equipment Protection and Personal Safety
If the ignition fails, the gas supply is automatically cut off. An error code will appear as
a flashing 2-digit code on the room thermostat. The error codes are discussed in the
troubleshooting section of the operation manual.
If the flame fails and/or the re-ignition attempt fails, the gas supply is automatically cut
off. An error code will appear on the room thermostat. Refer to troubleshooting guide
for further information.
When the power is restored after a power failure, the combination boiler will automatically
start and return to normal operation, manual reset is not required.
Occasionally an excessive gust of wind may be forced into the flue pipe. The air-ratio
control module will detect these strong back-drafts. To prevent any products of
combustion from re-entering the building through the open flue, the gas supply will be
automatically cut off. An error code will appear on the room. Refer to troubleshooting
guide for further information.
Abrupt, noisy startups and backfires are prevented by “soft ignition” a trademark of
our air-ratio control module.
Any overheating of the burners or heat exchanger will automatically shut down the
supply of gas to the burners. An error code will appear on the room thermostat. Refer
to troubleshooting guide for further information.
The water level in the heat exchanger is continuously monitored to prevent the combination
boiler from operating if there is no water or a restricted flow of water in the unit. The
combination boiler will be automatically shut down and an error code will appear on
the room thermostat. Refer to troubleshooting guide to further information.
Should the water level in the system fall too low, a sensor will automatically activate
the re-fill circuit.
1. Ignition Failure
2. Flame Detection
3. Power Interruption
4. Excessive Air Pressure
5. Explosive Re-ignition Protection
6. Overheat Protection
7. Low Water-Level Safety
8. Automatic Water Fill