Equipment Protection And Personal Safety - Navien CH-180 Operation Manual

Combination water heater operation
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Equipment Protection and Personal Safety

1. Ignition Failure
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.
2. Flame Detection
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.
3. Power Interruption
When the power is restored after a power failure, the combination water heater will
automatically start and return to normal operation, manual reset is not required.
4. Excessive Air Pressure
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.
5. Explosive Re-ignition Protection
Abrupt, noisy startups and backfires are prevented by "soft ignition" a trademark of our
air-ratio control module.
6. Overheat Protection
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.
7. Low Water-Level Safety
The water level in the heat exchanger is continuously monitored to prevent the
combination water heater from operating if there is no water or a restricted flow of water in
the unit. The combination water heater will be automatically shut down and an error code
will appear on the room thermostat. Refer to troubleshooting guide to further information.
8. Automatic Water Fill
Should the water level in the system fall too low, a sensor will automatically activate
the re-fill circuit.
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