Daikin FC Series - Page 31

Blinking Fault Codes... (continued)
Fault Code System Failure
Code 2-3
*Flame Signal Overrange*
Flame signal value is too high to be valid.
a. Make sure the ame detector and ame
amplier are compatible.
b. Remove the ame amplier and inspect its
connections. Reset the ame amplier.
c. Reset and sequence the relay module.
d. Check the ame detector sighting position;
reset and recycle. Measure ame strength.
Verify that it meets specications. If not,
refer to the ame detector and/or ame
amplier checkout procedures in the
installation instructions.
e. If the code reappears, replace the ame
amplier and/or the ame detector.
f. If the fault persists, replace the relay module.
Code 3-1
*Running/Interlock SwitchProblem*
Running or Lockout Interlock fault during
Prepurge.
a. Check wiring; correct any errors.
b. Inspect the fan; make sure there is no air
intake blockage and that it is supplying air.
c. Make sure the Lockout Interlock switches
are functioning properly and the contacts
are free from contaminants.
d. Reset and sequence the relay module to
Prepurge (place the TEST/RUN Switch in
the TEST position, if available). Measure
the voltage between terminal 7 and G
(ground); 120 Vac should be present.
Switch TEST/RUN back to RUN.
e. If steps 1 through 4 are correct and the fault
persists, replace the relay module.
Code 3-2
*Running/Interlock On During
Standby*
Lockout Interlock powered at improper
point in sequence or On in Standby.
a. Check wiring to make sure that the Lockout
Interlocks are connected properly between
terminals 6 and 7. Correct any errors.
b. Reset and sequence the relay module.
c. If the fault persists, measure the voltage
between terminal 6 and G (ground), then
between terminal 7 and G. If there is 120
Vac at terminal 6 when the controller is
o󰀨, the controller switch may be bad or is
jumpered.
d. If steps 1 through 3 are correct and there
is 120 Vac at terminal 7 when the controller
is closed and the fault persists, check for a
welded or jumpered Running Interlock or
Airow Switch. Correct any errors.
e. If steps 1 through 4 are correct and the fault
persists, replace the relay module.
Code 3-3
*VPS in Improper State*
VPS (Valve Proving Switch) in wrong
state during VPS Test.
a. Check wiring, making sure upstream valve
is connected to terminal 9 and downstream
valve is connected to terminal 17.
b. Conduct Valve Seat leakage test using a
manometer.
c. Reset and sequence the relay module;
if fault repeats, test VPS (connected to
terminal 16) is functioning properly; replace
if necessary.
d. Reset and sequence the relay module.
e. If fault persists, replace the relay module.
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