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Gas Valve Diagnostic Codes (See Figure 44)
OFF = Control not powered
Heartbeat = Normal Operation (Standby or call for heat)
1 Flash = Not used
2 Flashes = Pressure switch closed when should be open
3 Flashes = Pressure switch circuit was still sensed as open 30 seconds after the inducer was energized. System is
in 5 minute delay mode, with inducer off. After 5-minute delay, a new ignition sequence will be initiated.
(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 = Soft Lockout -Maximum recycle count exceeded - Last failure was Flame Sense Lost During Run
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.
NOTE 1:The 6 + X designation indicates a combination of flash codes: 6 flashes shows the control is in soft lockout, followed by X flashes
to indicate the reason the control went into soft lockout. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence
after a five minute delay period, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence immediately.
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
Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code will indicate which
was the last 'abnormal' event that put the system into the soft lockout state based on the table above.
Typical Gas Valve Honeywell
OUTLET
PilotPressure
A_ustment(Hidden)
On\Off
INLET
Diagnostic Light
Manifold Pressure
Adjustment
dwg 25-23-31a
[_ 44001102004