Hurricane SCH25, Service And Troubleshooting Manual

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Page 18
3.15.
7
- Flame Out
The flame went out or did not ignite.
• The burner will shut down.
• The diagnostic code,
7
will be displayed.
• The control board will try to restart the burner two more times. After
two unsuccessful restart attempts, the buzzer will sound for 10
seconds.
• The control board will purge with the combustion fan and circulating
pump for two minutes. The diagnostic code
7
will continue to be
displayed.
• The single most common reason for flame out faults is when air gets
into the fuel system. This is normally caused by loose fittings or
when your fuel supply is teed off a fuel line used by your engine or
generator. As air accumulates and passes through the nozzle, it
interrupts the fuel and shuts down the burner. When this happens, it
may be necessary to reset the fault a few times to ensure all air has
passed through the system. If the burner resumes normal operation,
you must find the source of the air leak, otherwise, this fault will
continue to occur.
• Check the connections on the fuel tank, fuel pump, the regulator, and
at the nozzle for air leaks. Find source of air entry and repair. Make
sure the nozzle or fuel filter is not clogged.
• Check the air line hoses for any restriction of airflow through the
compressor. Restrictions may be caused by a crimped hose, clogged
air filter, or a loose or leaking air hose from the compressor outlet to
the nozzle. Check the air filter inlet for any obstructions.
• Check for negative pressure in the area around the heater. When the
engine is running, it can draw air back through the heater’s exhaust
pipe. All intake air and exhaust connections must be tight.
• Check for restrictions or leaks in the combustion air intake hose or
exhaust pipe.
• Check for open circuit on fuel pump/solenoid and compressor.
• To restart the burner, check the fuel supply and clean the nozzle.
Then reset the fault by switching the service switch or the remote
switch OFF then ON again.
• If when reset, the board shuts down without trying to restart the
burner, the board or flame sensor is defective.