Fault Codes - Daikin FC Series Installation And Maintenance Manual

Table 7: Fault codes
Blinking Fault Codes . . .
Fault Code
Code 1-1
*Low AC Line Voltage*
Code 1-2
*AC QualityProblem*
Code 2-1
*UnexpectedFlame Signal*
Code 2-2
*Flame Signal Absent*
IM 684-6 • ROOFTOP SYSTEMS
System Failure
Low AC Line detected .
Excessive noise or device running on
slow, fast, or AC line dropout detected .
Flame sensed when no flame is expected
during STANDBY or PURGE .
No-flame time present at the end of the
Pilot Flame Establishing Period; lost
during the Main Flame Establishing
Period or during RUN .
30
a . Check the relay module and display module
connections .
b . Reset and sequence the Relay Module .
c . Check the 7800 power supply and make
sure that frequency and voltage meet
specifications.
d . Check the backup power supply, as
appropriate .
a. Check that flame is not present in the
combustion chamber; correct any errors .
b. Make sure that the flame amplifier and
flame detector are compatible.
c . Check the wiring and correct any errors .
d. Remove the flame amplifier and inspect its
connections. Reseat the amplifier.
e . Reset and sequence the relay module .
f. If the code reappears, replace the flame
amplifier and/or the flame detector.
g . If the fault persists, replace the relay
module .
a. Measure the flame signal. If one exists,
verify that it meets specifications.
b. Make sure that the flame amplifier and
flame detector are compatible.
c . Inspect the main fuel valve(s) and valve
connection(s) .
d. Verify that the fuel pressure is sufficient
to supply fuel to the combustion chamber .
Inspect the connections to the fuel pressure
switches . Make sure they are functioning
properly .
e. Inspect the Airflow Switch and make sure
that it is functioning properly .
f. Check the flame detector sighting position;
reset and recycle. Measure the flame signal
strength. Verify that it meets specifications.
If not, refer to the flame detector and/or
flame amplifier checkout procedures in the
installation instructions .
g. Replace the flame amplifier and/or the
flame detector, if necessary.
h . If the fault persists, replace the relay module
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Fault Codes

Fault Codes