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Table 2: 7-Segment Display Codes
Condition
Call for Heat (W) with Pre-Purge Active
Call for Heat (W) with Inter-Purge Active
Call for Heat (W) with Post-Purge Active
Call for Heat (W) Trial for Ignition
Period Active
Call for Heat (W) after flame is active –
with Integrated Thermostat OFF
Weak Flame Signal Sensed
Internal Control Error
Gas Valve On (GV) Error
Flame Sensed Out of Sequence
Vent Damper Error
Loss of IRQ signal
Fuse Open
No Flame During TFI
Flame Out During Run
Gas Valve Off Error
Gas Valve Off Lockout
Air Temperature Sensor Error
Wrong 24VAC Supply
Pressure Switch Open
Pressure Switch Stuck Closed
NFC Connectivity Error
Bluetooth Connectivity Error
Control
Operation
Status
Fault
Hold OPTION
Code
Standby
and SELECT
Recall
Fault
Hold OPTION
Code
Standby
and SELECT
Reset
Hold OPTION
Unlock
Standby
and SELECT
Settings
Note: heat call is ignored when control is in Error Code Recall, Reset or Unlock Settings menu
explained above
LED
LED
1
2
h
h
P P
h
h
I I
h
h
P P
t
t
F F
h h
t t
F
F
L L
E
E
1 1
E
E
0 0
E
E
0 0
E
E
0 0
E
E
0 0
E
E
0 0
E
E
0 0
E
E
1 1
E
E
2 2
E
E
1 1
E
E
0 0
E
E
0 0
E
E
0 0
e
e
C C
e
e
C C
Duration
LED
Action
of
Display
Action
F L T
F L T
2-5
after 2
seconds
together
seconds
Alternates
between
C L r
C L r
5-10
seconds
together
F L T
F L T
after 5
seconds
U n L
U n L
10-20
after 10
seconds
together
seconds
LED
Comment/Troubleshoot Step
3
Pre-purge is the delay during a heat call before a spark
r r
Inter-purge is the delay during a heat call in between spark ignition
P P
o o
Post-purge is the delay immediately after a heat call has ended
I I
TFI is the time period in which the control attempts to spark for ignition
Appears when flame is active during normal heat call; Toggles
with Weak Flame Signal (if applicable)
o o
Check flame probe, clean or replace probe if needed
LEDs will be blank, wait for control to reset;
if problem persists, replace control
1 1
GV is on when it shouldn't be, check GV
“4”
“4”
Check ignition source, gas valve or flame probe
“5”
“5”
Check Vent Damper and Vent Damper connections
0 0
Recycle power and replace control if problem persists
“6”
“6”
“2”
“2”
Check ignition source, gas valve or flame probe
“3”
“3”
Check ignition source, gas valve or flame probe
2 2
Gas Valve off when it shouldn't be, check GV
Excessive GV off error, control will go into auto-restart delay
2 2
0 0
Check Air Temperature Sensor and AirT connection
8 8
Check supply voltage source. Must be >18VAC and <30VAC
1 1
Check Pressure Switch connection
9 9
Check Pressure Switch connection
1 1
2 2
• A maximum of 5 error codes are stored in the sequence they occur
• Press OPTION button < 1 second to advance to next fault code
• When OPTION button is pressed after last error code, LEDs return
to current status of unit
• E N o
will be displayed if there are no error codes stored
E N o
• Once both OPTION and SELECT are released after holding them
together for 5-10 seconds, the LEDs will flash C L r
indicate the error codes have been successfully erased, control will
and
then return to current status
• Error codes are stored in the control's memory for up to 14 days
(error codes stored in systems powered by TH-W will have no
expiration)
•
All settings on the control will lock after 10 consecutive calls for heat
•
Once both OPTION and SELECT are released after holding them
together for 10-20 seconds, the LEDs will flash U n L
indicate the settings have been unlocked
Troubleshooting
ignition attempt
attempts
Replace 5 amp ATC fuse (F1)
and then reset
Recycle power
Recycle power
Extra Notes
C L r
U n L
3 times to
3 times to
7
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