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50F06-843
!
Universal Furnace Electronic Fan
Timer Control Kit
INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
PARTS INCLUDED
• 50F06-843 Electronic Fan Timer Control Board
• 2 - Main Harness Assemblies (ST9101, ST9141)
• 1 - Jumper Harness (ST9160)
• 2 - 7” Long Transformer Wiring Extensions (EXT)
• 2 - 3/16” QC crimp on terminals for
optional use with Wiring Extensions
• 4 - 1” Sheet Metal Mounting Screws
(for mounting tray corner locations)
DESCRIPTION
The 50F06-843 is an aftermarket universal replacement fan
timer control kit for single stage furnaces with PSC inducer
and blower motors.
• 2 - ½” Sheet Metal Mounting Screws
(for mounting tray center tabs)
• 2 - Wire Ties
• Troubleshooting Label
• Installation Instructions
TWINNING: 50F06-843 can be twinned. Both control
boards must be from the same manufacturer for proper
functionality.
SPECIFICATIONS
ELECTRICAL RATINGS:
Input Low Voltage: 25 VAC, 60 Hz
Input Line Voltage: 115/230VAC, 60 Hz, 1φ
Max Input Current: 800mA @ 25 VAC
Relay Contact Ratings:
Inducer Output: 1.5 FLA @ 115 VAC
.75A @ 230 VAC
Blower Output: 15 FLA @ 115 VAC
7.5A FLA @ 230VAC
Humidifier and EAC Load: .8A FLA @ 115 VAC
.4A FLA @ 230VAC
POST PURGE TIMING:
5 seconds
LOCKOUT AUTO RESET TIMING:
60 minutes
OPERATING TEMPERATURE RANGE:
-40° to 176°F (-40° to 80°C)
HUMIDITY RANGE:
5 to 95% relative humidity (non-condensing)
GASES APPROVED: Natural, Manufactured, Mixed,
Liquid Petroleum, and LP Gas Air Mixtures.
CAUTION
Risk of Electric Shock.
Disconnect electric power
to system until installation
is complete. Do not use on
circuit exceeding specified
voltage. Higher voltage will
damage control and could
cause shock or fire hazard
This control is not intended
for use in locations where
it may come in contact with
water.
May cause flame rollout.
Shut off main gas to
heating system until
installation is complete.
PART NO. 37-7803001
emerson.com/white-rodgers
View installation video
1931
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TABLE 1: CROSS REFERENCE, HARNESS SELECTION, DIPSWITCH SETTINGS
(Harness Part Numbers Match Control Model Being Replaced for Easy Identication)
Honeywell, ICM,
Robertshaw
Control Model
ST9101A1006 Rheem ST9101 30 100 4 0 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9101A1014 Rheem 47-22827-xx
ST9101A1022 Trade ST9101 30 100 4 0 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9120A1006 Armstrong N/A 30 100 4 0 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9120A2004 Armstrong 40403-001 N/A 30 140 4 0 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9120B1005 Ducane N/A 30 60 4 0 OFF 30 ON OFF 60 OFF 4 OFF 30
ST9120C1012 Snyder Gen N/A 60 100 4 0 ON 60 OFF OFF 120 OFF 4 OFF 30
ST9120C1020 Nordyne N/A 60 100 4 0 ON 60 OFF OFF 120 OFF 4 OFF 30
ST9120C2002 York 031-01237-000 031-02959-000 N/A 30 100 4 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9120C2010 Ducane 20054502 CAR20054502 N/A 30 100 4 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9120C2028 Armstrong 40403-001
ST9120C3000 ICP HQ1010031HW 1010031 N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120C3018 Bard N/A 60 100 4 60 ON 60 OFF OFF 120 OFF 4 ON 60
ST9120C4008 ICP N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120C4016 ICP HQ1009836HW 1009836 N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120C4040 ICP HQ1011179HW 1011179 N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120C4057 ICP HQ1011927HW 1011927 N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
*ST9120C5005 ICP HQ1084197HW 1084197 N/A 30 140 4 30 OFF 30 OFF ON 150 OFF 4 OFF 30
*ST9120C5013 ICP HQ1170063HW
*ST9120D3009 Goodman B18099-11(S)
ST9120G2008 ICP HQ1008773HW 1008773 N/A 60 100 30 0 ON 60 OFF OFF 120 ON 30 OFF 30
ST9120G2016 ICP N/A 30 100 30 30 OFF 30 OFF OFF 120 ON 30 OFF 30
ST9120G2024 Skymark N/A 30 60 30 30 OFF 30 ON OFF 60 ON 30 OFF 30
ST9120G2032 Skymark N/A 30 60 4 100 OFF 30 ON OFF 60 OFF 4 ON 60
ST9120G4004 ICP HQ1009838HW 1009838, HG1009838HW N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120G4012 ICP HQ1009836HW 1009836 N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120G4038 Trade N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9120U1003 Trade N/A 30 140 4 30 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9120U1011 N/A 30 120 4 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9141A1002 Consolidated 406650 Weil-McLain 4116000 ST9141 30 140 6 60 OFF 30 OFF ON 150 OFF 4 ON 60
ST9141A1028 Consolidated ST9141 30 140 6 60 OFF 30 OFF ON 150 OFF 4 ON 60
ST9141B1001 Consolidated ST9141 75 180 6 60 ON 60 ON ON 180 OFF 4 ON 60
ST9150A1003** Consolidated N/A 36 168 7 72 OFF 30 ON ON 180 OFF 4 ON 60
ST9150B2000** N/A 36 144 7 0 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9150B2018** ICP N/A 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9150B2026** Ducane N /A 36 144 7 36 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9150B2034** N/A 36 144 7 36 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9160A1002 Armstrong 45392-001 ST9160 30 90 6 60 OFF 30 OFF OFF 120 OFF 4 ON 60
ST9160B1001 ST9160 30 120 6 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9160B1019 ST9160 30 120 6 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9160B1027 ST9160 30 120 6 60 OFF 30 OFF OFF 120 OFF 4 ON 60
ST9160B1035 ST9160 30 120 6 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9160B1043 ICP ST9160 30 140 6 30 OFF 30 OFF ON 150 OFF 4 OFF 30
ST9160B1050 ICP HQ1012358HW 1012358 ST9160 30 140 6 60 OFF 30 OFF ON 150 OFF 4 ON 60
ST9160B1068 Armstrong 45692-001 ST9160 30 120 6 60 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9160B1076 Ducane 2043081 28M99(01) ST9160 30 120 6 30 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9160B1084 ICP 1014460 ST9160 30 140 6 90 OFF 30 OFF ON 150 OFF 4 ON 60
ST9160C1000 ST9160 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ST9160C1018 ST9160 30 140 30 30 OFF 30 OFF ON 150 ON 30 OFF 30
ICM270 Evcon 2702-300
ICM270 Rheem 47-22827-xx
695-003 Rheem 47-22828-xx (Robertshaw) ST9101 OFF 30 OFF OFF 120 OFF 4 OFF 30
* Heat Fan O Delay seng may need adjustment based on performance
** Replacement requires 60Hz power supply
Appliance
OEM
OEM Part Alt OEM Part(s)
47-22693-xx,
47-22828-xx,
47-22830-xx
40403-002, 40403-003,
025-32816-000, 87H88
1170063, 1008786,
1009837, 1011543,
1012106, 1150489,
1160192, 1138-200
CARB1809911,
CARL38267
2895-3001,
026-34030-000
47-22693-xx,
47-22828-xx,
47-22830-xx
Harness
Req'd
ST9101 30 100 4 0 OFF 30 OFF OFF 120 OFF 4 OFF 30
ST9101
ST9101 OFF 30 OFF OFF 120 OFF 4 OFF 30
Original Delay Timing 50F06-843 Suggested Delays
Heat Cool Heat Cool
ON OFF ON OFF ON OFF ON OFF
seconds sw1-1 sec sw1-2 sw1-3 sec sw1-4 sec sw2-1 sec
N/A 30 100 4 60 OFF 30 OFF OFF 120 OFF 4 ON 60
N/A 30 140 4 30 OFF 30 OFF ON 150 OFF 4 OFF 30
N/A 30 140 4 60 OFF 30 OFF ON 150 OFF 4 ON 60
OFF 30 OFF OFF 120 OFF 4 OFF 30
Check Unit
Documentaon or
Exisng Control
BLUE SHADING = A CHANGE FROM DEFAULT SELECTION IS REQURED
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DIPSWITCH CONFIGURATION
TROUBLESHOOTING
GREEN
FLASH
AMBER
FLASH
RED
FLASH
1
Limit switch, burner limit switch, or fuse is open
X
X
2
Primary limit switch is open
X
Pressure switch improperly closed, or open
when inducer has been running >30 seconds
150 seconds.
>30VAC for more than 10 seconds. Not detected
seconds proper voltage.
9
Reversed 120VAC polarity / grounding
XXX
Other
Additional codes displayed on gas valve LED
X
Flash codes NOT stored in memory
Alternate
Alternate
Alternate
Self-test mode active
Rapid
Control power up
Solid
Standby
Continuous
Fan only call (G)
1
Call for cool (Y)
2
Call for heat (W)
6
Twinning error
DIPSWITCH SETTINGS
ONON
OFFOFF
ALTERNATE HEAT OFF DELAYS
ONON
OFFOFF
NOT USED
NOT USED
"G" FAN SPEED
COOL
60s
HEAT*
1 2 3 4
30s*
COOL OFF DELAY
SW2
30s
ON OFF
180s
4s*
COOL ON DELAY
HEAT OFF DELAY
120s*
ON OFF
HEAT ON DELAY
60s
30s*
1 2 3 4
SW1
*DEFAULT SETTING
150s
HEAT OFF DELAY
SW1
60s
HEAT OFF DELAY
1 2 3 4 1 2 3 4
SW1
Note: Cycle Power After Changes Are Made
ON
OFF
OFF
ON
Notes:
• To change settings break through yellow protective plastic film and make required adjustments
• See Table 1 for dipswitch setting recommendations by control board part number (any changes to be made from 50F06-843
defaults will be highlighted in BLUE)
• Cycle power after making any changes
INSTALLATION ACCESSORIES
• 7” long wiring extensions EXT can be used if existing transformer wires do not easily reach the new control board connections.
Extension wires have ¼” male x ¼” female spades
• 3/16” male crimp-on quick connects can be used to modify the EXT extension leads if they are needed for units having smaller
transformer connections
• Mounting screws can be used with the plastic tray CORNER HOLES (4x long) or MOUNTING TABS (2x short)
• Wire ties can be used to secure any wiring as needed
• Troubleshooting label can be placed on furnace access panel for referencing dipswitch setup and LED codes
DIPSWITCH SETTINGS
Note: Cycle power after changes are made
ON
OFF
NOT USED
1 2 3 4
OFF
1 2 3 4
OFF
1 2 3 4
HEAT *
30s *
SW2
1 2 3 4
150s
SW1
60s
SW1
OFF
4s *
120s *
30s *
SW1
NOT USED
“G” FAN SPEED
COOL OFF DELAY
COOL ON DELAY
HEAT OFF DELAY
HEAT ON DELAY
* DEFAULT SETTING
HEAT OFF DELAY
HEAT OFF DELAY
COOL
60s
ON
30s
ON
180s
ON
60s
ALTERNATE HEAT OFF DELAYS
ON
ON
LED
LED
LED
Up to 5 ash codes stored in memory (auto-erased after 14 days)
3
4
OFF
OFF
OFF OFF OFF Check power / internal control fault
ON
OFF
SELF-TEST - Power cycle control, press FAULT button 2x during rapid green ash
FAULT RECALL - In standby, hold FAULT button < 5 seconds
FAULT ERASE - In standby, hold FAULT button > 5 seconds but < 10 seconds
CONTROL LOCKOUT RESET - Remove 24VAC power > 10 Seconds
OFF
ON
7
8 Gas valve sensed energized when it should be off X
Solid ST9160 jumper missing, plug into connector J1 X
Place Jumper Harness ST9160 in connector J1 for ALL ST9160 replacements.
This Harness is NOT USED for any other replacements
ERROR / CONDITION
Overheated due to air not circulating (lockout).
Three consecutive primary limit open events >
Wrong 24VAC supply condition <18VAC or
with fault 9. Operation resumes with 120
JUMPER HARNESS
50F06-843
SYSTEM
TYPE
ST9101
ST9120
X
X
X X X
ALL
5002-0377
ST9141
ST9160
EXT
EXT
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ADAPTER HARNESSES, JUMPER PLUG, AND WIRING NOTES
(Harness Part Numbers Match Control Model Being Replaced for Easy Identication)
ST9101
Black to Control Board
L1/S/S1-S3 (E15 or E12
L1/S/S1-S3
Control Board E38
connector not used
(smallest 6-pin)
L2
Neutral
IND / DI
Furnace
9-pin
ST9101
L2
Neutral
Used with Honeywell ST9101, ICM270, and Robertshaw 695-003 Control Replacements
ST9141
ST9141
Furnace
9-pin
PRSW
Blue to Control Board
IND/DI (E2)
Control Board
6-pin J1
2 Whites to any Control
Board Neutrals (E1-E7)
Control Board E38
connector not used
(smallest 6-pin)
Control Board
6-pin J1
Brown to Control Board
PRSW (E30, remove
protective cap)
LIM
Used with Honeywell ST9141 Control Replacements
ST9120
These Control Replacements install without the use of a wiring harness.
Plug factory wiring into
For additional details please see WIRING DIAGRAM and original appliance schematic
4
Gray to Control
Board LIM (E24, remove
protective cap)
Control Board E38
connector not used
(smallest 6-pin)
Control Board
6-pin J1
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ADAPTER HARNESSES, JUMPER PLUG, AND WIRING NOTES
(Harness Part Numbers Match Control Model Being Replaced for Easy Identication)
ST9160
Plug factory wiring into
Control Board E38
(smallest 6-pin)
Jumper Harness required on all ST9160 Systems. Failure to install will
disable furnace operation and produce a Solid Amber LED code.
Jumper plugs into
Control Board
ST9160
6-pin J1
For additional details please see WIRING DIAGRAM and original appliance schematic
INSTALLATION
MOUNTING AND WIRING
NOTE: All wiring should be installed according to local and
national electrical codes and ordinances.
1. Disconnect electrical power and gas supply to unit, then
remove unit access panels.
2. Mark and disconnect all wires from the existing control,
then remove control. TIP: first take a picture or two for
reference.
3. 50F06-843 can be mounted in any orientation. Select a
location that will not damage, obstruct or place any stress
on the terminations or harnesses.
4. Mount 50F06-843 in the unit using one of the two
mounting tray options noted below. Be certain not to
damage any components such as transformers, wire
harness or blower wheels when drilling or installing
screws.
5. Refer to Table 1 and select the proper wire adapter(s)
or jumper needed to replace the existing control board
(if applicable).
6. Adjust Cool ON, Cool OFF, Heat ON, and Heat OFF
delay dipswitches if needed per Table 1 and “Dipswitch
Configuration” section.
7. Reconnect all wires to 50F06 control board referencing
“Adapter Harnesses, Jumper Plug, and Wiring Notes”,
“Wiring Diagram”, and “Blower, Accessory, and
System Operation” sections as needed.
8. Ensure all wires are secure to the control board and
unused blower speed wires are attached to the M1, M2,
M3 / Unused terminals. Apply wire ties as needed to
secure wiring.
9. Install provided Troubleshooting Label in a suitable
location for easy viewing.
10. Reinstall unit access panels and reconnect electric power
and gas supply to the unit.
11. Verify unit operation in Heat, Cool, and Fan modes.
Corner Holes will match many existing OEM locations with no drilling
required. Use 4 x 1” screws. Tray can also be used as template for
drilling new locations if needed.
Universal Tab Drill Holes. Use tray as template and 2 x ½” screws for
mounting.
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INDUCER
MOTOR
UNUSED MOTOR
LEADS
120VAC
HUMIDIFIER
HOT / L1NEUTRAL / L2
FUSE
115 / 230 VAC
INPUT
AIR CLEANER
2
120VAC
OPTIONAL CONTINUOUS (LOW)
1
BLOWER
MOTOR
115 / 230 VAC
24 VAC CLASS II
TRANSFORMER
24 VAC
3
1
4
5
2
3
6
3
WIRING DIAGRAM
1
4
2
5
3
6
3
ACC MAY BE CONNECTED IN ST9101 SYSTEMS HAVING
1
ONE FAN SPEED FOR BOTH HEAT AND COOL
FOR 230 VAC INSTALLATIONS THE VOLTAGE READING
2
BETWEEN L1 AND APPLIANCE CHASIS MUST BE 115 VAC
3
REMOVE PROTECTIVE CAP TO USE
OPTIONAL TERMINALS
THERMOSTAT
INPUTS
Additional Notes:
- ST9101 systems (also ICM270/RS 695) have INDUCER MOTOR, HOT / L1, and NEUTRAL / L2 connected through adapter harness
- ST9141 systems have Limit and Pressure Switch connected through adapter harness to E24 (LIM) and E30 (PRSW) terminals
- ST9160 systems have INDUCER MOTOR connected to Gas Valve control
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SELF-TEST
NOTE
50F06-843 is equipped with a self-test routine that checks the
functionality of the control, blower, and inducer to verify they
are in proper working order. Ensure thermostat is turned OFF
or thermostat wires are disconnected to enable.
ENTER SELF-TEST BY:
• Turn on power and/or manually close blower door switch
• Wait 1 second
• Slowly double-click “FAU LT ” button within ~3 seconds
SEQUENCE IS AS FOLLOWS:
• LED will flash in red the five last stored fault codes
• Afterward, the LED will slowly flash alternate colors (red,
amber, green) to indicate Self-Test is active and continue
until Self-Test is complete
• For ST9160 furnaces using E38 primary connector:
1. Blower operates HEAT speed for 10 seconds
Self-Test is available after power up and until a solid green
LED is present (5 seconds after power up). During this
time, the control will ignore all active calls. If a solid
green LED is present, disconnect power for 10 seconds
before starting Self-Test routine.
2. Blower operates COOL speed for 10 seconds
3. Blower shuts off and control goes to Standby
• For all ST9101, ST9120, and ST9141 Furnaces using J1
primary connector:
1. Inducer operates for 7 seconds
2. Blower operates HEAT speed for 10 seconds, inducer
continues to run
3. Blower operates COOL speed for 10 seconds, inducer
is off
4. Blower shuts off and control goes to Standby
BLOWER, ACCESSORY, AND SYSTEM OPERATION DETAILS
Action System & Control Response - All Models
"Y" call for cool from thermostat
"Y" call for cool removed
"G" call for fan from thermostat
"G" call for fan removed - Blower is de-energized without delay
CONT continuous blower fan - option
to connect blower low speed tap
EAC electronic air cleaner - optional
line voltage accessory
HUM humidifier - optional line voltage
accessory
ACC single speed blower
Action System & Control Response – ST9101 & ST9120 Models
"W" call for heat from thermostat
"W" call for heat removed
- Contactor is energized
- Cool ON delay timer, then blower energized at COOL speed
- Contactor is de-energized
- Cool OFF delay timer, then blower is de-energized
- Blower is energized without delay at HEAT speed (default) or at COOL speed
(optional - if selected by dipswitch)
- If a call for heat occurs, blower runs at HEAT speed
- If a call for cool occurs, blower runs at COOL speed
- Always energized with no call for HEAT "W", COOL "Y", or FAN "G"
- If blower operation is required for HEAT, COOL, or FAN then control switches to
appropriate speed
- EAC terminal is energized with blower HEAT or COOL output, EAC is not energized
when CONT blower terminal is energized
- HUM terminal is energized with inducer output
- ACC terminal is energized with "Y" or "W" and is a convenience terminal for ST9101
systems using the same blower speed for HEAT and COOL
- Inducer energized
- Pressure switch makes
- Ignition system energized
- Gas valve opens, main burner lights
- Heat ON delay timer, then blower energized at HEAT speed
- Ignition system de-energized, gas valve closes
- 5 second postpurge timer, then inducer is de-energized
- Heat OFF delay timer, then blower is de-energized
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BLOWER, ACCESSORY, AND SYSTEM OPERATION DETAILS
Action System & Control Response – ST9101 & ST9120 Models cont.
- Ignition system is de-energized
Limit switch string opens
Limit switch string remakes
Action System & Control Response - ST9141 Models
"W" call for heat from thermostat
"W" call for heat removed
Primary limit switch string opens
Primary limit switch string closes
Primary limit string open >150
seconds for 3 consecutive cycles
Burner limit switch string opens
Burner limit switch string remakes
- Gas valve closes
- Inducer energized, blower energized at HEAT speed
- Red fault LED flashes once
- Inducer energized for 5 second postpurge timer
- Blower remains energized for dipswitch selected HEAT off delay timer
- Normal operation resumes
- Pressure switch confirmed in no airflow position, otherwise Red fault LED flashes
three times
- Inducer energized
- Pressure switch makes. If pressure switch shows no airflow >30 seconds Red fault
LED flashes three times
- Ignition system energized
- Gas valve opens, main burner lights
- Heat ON delay timer, then blower energized at HEAT speed
- Ignition system de-energized
- Gas valve closes
- 5 second postpurge timer, then inducer is de-energized
- Heat OFF delay timer, then blower is de-energized
- Ignition system is de-energized
- Gas valve closes
- Inducer de-energized, blower energized at HEAT speed
- Red fault LED flashes twice
- Blower de-energized after HEAT off delay timer
- Normal operation resumes
- Inducer, blower, and ignition system de-energized. Control lockout until 24VAC reset
>10 seconds. Red fault LED flashes four times
- Ignition system de-energized
- Gas valve closes
- Inducer energized, blower energized at HEAT speed
- Red fault LED flashes once
- Inducer energized for 5 second postpurge timer
- Blower remains energized for dipswitch selected HEAT off delay timer
- Normal operation resumes
Action System & Control Response - ST9160 Models
"W" call for heat from thermostat
"W" call for heat removed
Limit switch opens at SVll system
control (gas valve)
Limit switch open condition removed
at SVll system control (gas valve)
8
- 50F06-843 control detects SVll system via data line at power up
- Request for HEAT passed to SVll system control (gas valve) on data line
- Main burner lights
- Heat ON delay timer, then blower energized at HEAT speed
- Request for HEAT removed from SVll system control (gas valve) on data line
- Heat OFF delay timer, then blower is de-energized
- Blower will remain energized at HEAT speed. Valve green LED flashes 4 times
- Blower remains energized for dipswitch selected HEAT off delay timer. Normal
operation resumes. Valve green LED displays bright/dim heartbeat
Page 9
TROUBLESHOOTING, FAULT AND STATUS CODES
The LED will indicate fault or status codes as shown in the table below:
TROUBLESHOOTING
GREEN
LED
FLASH
AMBER
LED
FLASH
RED
LED
FLASH
ERROR / CONDITION
Up to 5 ash codes stored in memory (auto-erased after 14 days)
1 Limit switch, burner limit switch, or fuse is open
2 Primary limit switch is open
SYSTEM
TYPE
ST9101
ST9120
X X
ST9141
X
ST9160
Pressure switch improperly closed, or open when inducer has been
3
running >30 seconds
Overheated due to air not circulating (lockout). Three consecutive
4
primary limit open events >150 seconds.
Wrong 24VAC supply condition <18VAC or >30VAC for more than
7
10 seconds. Not detected with fault 9. Operation resumes with 120
seconds proper voltage.
8 Gas valve sensed energized when it should be off
9 Reversed 120VAC polarity / grounding
Other Additional codes displayed on gas valve LED
Flash codes NOT stored in memory
Solid ST9160 jumper missing, plug into connector J1 X
OFF OFF OFF Check power / internal control fault
Alternate Alternate Alternate Self-test mode active
Rapid Control power up
Solid Standby
Continuous Fan only call (G)
1 Call for cool (Y)
2 Call for heat (W)
6 Twinning error
SELF-TEST - Power cycle control, press FAULT button 2x during rapid green ash
FAULT RECALL - In standby, hold FAULT button < 5 seconds
FAULT ERASE - In standby, hold FAULT button > 5 seconds but < 10 seconds
CONTROL LOCKOUT RESET - Remove 24VAC power > 10 seconds
X
X
X X X
X
X X X
X
ALL
FAULT RECALL
When the control is in Standby mode (no call for heat or cool),
press the fault button for approximately 2 to 5 seconds or until
the diagnostic LED turns off. Up to 5 fault codes are stored.
NOTE: While displaying the stored fault codes, the control will
ignore any new call for heat, cool or fan.
FAULT CODE ERASE & RESET
When the control is in Standby mode (no call for heat or
cool), press the fault button for 5 to 10 seconds or until the
diagnostic LED begins to rapid flash.
NOTE: If the button is pressed for over 10 seconds the rapid
flash will stop and the control will return to Standby.
CONTROL LOCKOUT RESET
Control automatically resets after 1 hour in lockout. Removing
24VAC power to the control for greater than 10 seconds will
reset the control.
TWINNING
• Connect Twin/Z1/Z2 terminal between two boards using
an 18ga wire. Boards must be from same manufacturer.
• Board with thermostat connected has full functionality
including LED and dipswitch settings. Twinned board
will operate blower only simultaneously (LED showing
Standby) unless “W” or “Y” are powered to it.
• Twinned unit can be wired for Heat by utilizing the “W”
terminal either with the 1st unit or as a 2nd stage.
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Page 10
Emerson and White-Rodgers are
trademarks of Emerson Electric
Co. ©2019 Emerson Electric Co.
All rights reserved.
TECHNICAL SUPPORT: 1-888-725-9797
emerson.com/white-rodgers
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