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 flame detector and flame
amplifier are compatible.
b. Remove the flame amplifier and inspect its
connections. Reset the flame amplifier.
c . Reset and sequence the relay module .
d. Check the flame detector sighting position;
reset and recycle. Measure flame strength.
Verify that it meets specifications. If not,
refer to the flame detector and/or flame
amplifier checkout procedures in the
installation instructions .
e. If the code reappears, replace the flame
amplifier and/or the flame 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
off, 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
Airflow 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 .
Fault Codes
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