HONEYWELL SV9541M "SMART VALVE" Trouble shooting
The 6+ X designation indicates acombi nation of flash codes: 6flashes shows the control isin soft lockout, followed byX flashes to indicate
the reason the control went into soft lockout. Last status code indicates repair to address first
LED INDICATES CHECK/REPAIR
STATUS
Linevoltage inputat L1 and Neutral connectors onST9160B Fan Timer.
Off Nopower tosystem control. Lowvoltage (24V) power at 24 VAC andCOM terminals on ST9160B
System wiring harness is in good condition and securely connected.
Heartbeat Normalindication whenever the system ispowered, unless some Not Applicable - Normal Operation (stand byor call forheat)
Bright - Dim abnormal event has occurred.
Pressure switches closed when it should be open Pressure switches stuck closed (system will wait for pressure switch to
2Flashes (i.e. whencall for heat begins), open).
(Combustion blower is not energized untilpressure switches
opens) Pressure switches miswired orjumpered.
Pressure switches, open when they should be closed (i.e.longer
than 30 seconds alter combustion blower/inducer is energized).
3Flashes

4Flashes

5Flashes

6Flashes +

I Flash

6Flashes +

2Flashes

Systemgoes into5-minute delay period, with combustion blower/
inducer off. At end ofthe 5-minute delay, another cycle will begin.
Main Limit or Roll Out Switch is open.
Combustion blower is energized, Circulating blower is energized
heatspeed.
Flame signal sensed out of proper sequence.
Combustion blower is energized, Circulating blower is energized
heatspeed afterthe "ON" delay.
Soft Lockout.
Failed to light pilot during 90 sec. trial for ignition
Combustion air blower is de-energized, Circulatingblower isde-
energized after the "OFF"delay.
After 5-minute delay time,control system will reset and initiate a
newignition sequence,
Soft Lockout.
Lastfailure was Flame Sense lost during run.
Maximum recycle count exceeded
Combustion air blower is de-energized, Circulating blower is
de-energized alter the "OFF" delay.
After 5-minute delay time,control system will reset and initiate a
newignition sequence,
Ignitionsystem control switch must be inthe ON position.
Pressure switches operation, tubing, and wiring.
Restrictions in furnace airintake or vent piping.
Main limit switch.
Manual reset burner rollout switch.
Limitand rollout switch wiring is in good condition and securely
connected.
Flame at pilot burner.
Gassupply off or pressure too lowor high for appliance to operate.
Damaged or broken HSI element
Linevoltage HOT lead wirenot connected to L1 terminal on ST9160B.
Furnace not properly earth grounded.
Flame sense rod contaminated orin incorrect position.
Pilotburner located in incorrect position.
Pilotburner lead wires are in good condition and popery connected.
Pressure switches operation, tubing, and wiring.
Gassupply off or pressure too lowor high for appliance to operate.
Linevoltage HOT lead wirenot connected to L1 terminal on ST9160B.
Furnace not properly earth grounded.
Flame sense rod contaminated orin incorrect position.
Pilotburner located in incorrect position.
Pilotburner lead wires are in good condition and properly connected.
Cycling, pressure switch
Condensate drain blocked
Pressure switches operation, tubing, and wiring.
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