35
441 01 2611 06
Gas Control Valve Diagnostic Codes (See F igure 40)
OFF = Control not powered
Heartbeat = Normal Operation (Standby or call for heat)
1 Flash = Not used
2 Flashes = Low Pressure switch closed when should be open
3 Flashes = LowPressureswitchcircuitwasstillsensedasopen 30 seconds afterthe inducer was energized.System
is in 5 minute delay mode, with inducer off. After 5--minute delay, a new ignition sequence will beinitiated.
(Note: SV9541M On/Off switch in off position during a call for heat will generate this diagnostic code)
4 Flashes = Limit switch string open
5 Flashes = Flame sensed out of sequence -- Flame signal still present.
6 Flashes + 1 Note 1 = Soft Lockout --Maximum retry count exceeded (failed to light within 4 trials for ignition)
6 Flashes + 2 Notes 1,2 = SoftLockout --Maximumrecyclecountexceeded -- LastfailurewasFlameSenseLostDuringRun,Cycling
Pressure Switch or Blocked Condensate.
6 Flashes + 3 Notes 1,2 = Soft Lockout --Maximum recycle count exceeded -- Last failure was Airflow Proving Circuit Opened
During Run
6 Flashes + 4 Notes 1,2 = Soft Lockout --Maximum recycle count exceeded -- Last failure was Limit Circuit Opened During Run
7 Flashes = Soft Lockout Due to Limit Trips Taking Longer than 2 minutes to Reset; Auto Reset After 1 Hour if
Call for Heat Still Present. Reset by Cycling Call for Heat at Any Time.
NOTE1:The6+Xdesignationindicatesacombinationofflashcodes:6flashesshowsthecontrolisinsoftlockout,followedbyXflashes
toindicate thereasonthe controlwentinto softlockout.Whenthe6+Xcodeisflashing,theSV9541willattemptanewignitionsequence
afterafiveminutedelayperiod,ifthecallforheatisstillpresent.Resetofthethermostatwillinitiateanewignitionsequenceimmediately.
NOTE 2: Any combination of 5 ‘abnormal’ events during a single call for heat will result in soft lockout. An ‘abnormal’ event is a Flame
SenseFailureDuringRun,AirflowProvingCircuitOpenDuringRun,orLimitCircuitOpenDuringRun.Theflashcodewillindicate which
was the last ‘abnormal’ event that put the system into the soft lockout state based on the table above.
Typical Gas Control Valve Honeywell
Figure 40
INLET
OUTLET
Diagnostic Light
(on some models)
25--22--25a
On/Off
Switch
Pilot Pressure
Adjustment
Manifold Pressure
Adjustment
(Hidden)
Manifold
Pressure
Tap
Supply
Pressure
Tap (Hidden)
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