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ST9120B,U UNIVERSAL ELECTRONIC FAN TIMERS
No. of flashes
Condition
dim/on (heartbeat) Device works correctly.
1
Limit switch (ST9120) or burner limit switch (ST9141) is open.
2
Primary limit switch (ST9141) is open.
Pressure switch is improperly closed or pressure switch open when inducer blower has been
3
running for >30 sec.
4
Control is in lockout due to air not circulating (overheated).
5
Smart Valve II limit switch is open.
6
Twinning communication corrupted (check system transformers' phasing).
7
Wrong 24 VAC supply condition.
Replaced
Control Model
Original OEM
Number
Appliance
ST9101A1006
Rheem
ST9101A1014
Rheem
ST9101A1022
Trade
ST9120A1006
Armstrong
ST9120A2004
Armstrong
ST9120B1005
Ducane
ST9120C1012
Snyder General
ST9120C1020
Nordyne
ST9120C2002
York
ST9120C2010
Ducane
ST9120C2028
Armstrong
ST9120C3000
ICP
ST9120C3018
Bard
ST9120C4008
ICP
ST9120C4016
ICP
ST9120C4040
ICP
ST9120C4057
ICP
*ST9120C5005
ICP
*ST9120C5013
ICP
*ST9120D3009
Goodman
ST9120G2008
ICP
ST9120G2016
ICP
ST9120G2024
Skymark
ST9120G2032
Skymark
ST9120G4004
ICP
ST9120G4012
ICP
ST9120G4038
Trade
ST9120U1003
Trade
Consolidated
ST9141A1002
Industries
Consolidated
ST9141A1028
Industries
Consolidated
ST9141B1001
Industries
Consolidated
ST9150A1003
Industries
*Heat fan off delay setting may need adjustment based on performance. See Fig. 10 to adjust timings.
69-2252EF—07
Table 2. LED Diagnostic Troubleshooting Codes.
Table 3. Recommended Default Dip Switch Settings.
Legacy Timing
Heat
Heat
Cool
On
Off
On
sec
sec
sec
30
100
4
30
100
4
30
100
4
30
100
4
30
140
4
30
60
4
60
100
4
60
100
4
30
100
4
30
100
4
30
100
4
30
140
30
60
100
4
30
140
30
30
140
30
30
140
30
30
140
30
30
140
4
30
140
4
30
140
4
60
100
30
30
100
30
30
60
30
30
60
4
30
140
30
30
140
30
30
140
30
30
140
4
30
140
6
30
140
6
75
180
6
36
168
7
Cool
Off
Heat On
Heat Off
sec
1
sec
2
0
off
30
off
0
off
30
off
0
off
30
off
0
off
30
off
0
on
30
off
0
off
30
on
0
on
60
off
0
on
60
off
30
off
30
off
30
off
30
off
60
off
30
off
30
off
30
off
60
on
60
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
60
off
30
off
0
on
60
off
30
off
30
off
30
off
30
on
100
off
30
on
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
60
off
30
off
60
off
30
off
60
on
60
on
72
off
30
on
4
New ST9120B,U
Cool On
3
sec
4
sec
off
120
off
4
off
120
off
4
off
120
off
4
off
120
off
4
on
150
off
4
off
60
off
4
off
120
off
4
off
120
off
4
off
120
off
4
off
120
off
4
off
120
off
4
on
150
on
30
off
120
off
4
on
150
on
30
on
150
on
30
on
150
on
30
on
150
on
30
on
150
off
4
on
150
off
4
on
150
off
4
off
120
on
30
off
120
on
30
off
60
on
30
off
60
off
4
on
150
on
30
on
150
on
30
on
150
on
30
on
150
off
4
on
150
off
4
on
150
off
4
on
180
off
4
on
180
off
4
Cool Off
5
sec
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
off
30
on
60
off
30
on
60
off
30
off
30
off
30
off
30
off
30
off
30
on
60
off
30
off
30
off
30
on
60
off
30
off
30
off
30
off
30
on
60
on
60
on
60
on
60
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