37
Table A7 - Troubleshooting Error Codes
Error
Code
Number
Definition
Error Display clearing ( once error condition has disappeared)
Clears itself
when root
problem is
solved
Cycle
Power
OFF
Push
any
key
Up/down
key when
status is
displayed
Explanation
Things to look for
4
Flame current lower
than threshold
Control requires a strong
enough signal to verify flame
is present. Signal too low.
1. Check pilot flame sense is clean.
2. Check for proper ground
3. Check wiring
4. Check for correct pilot orifice
5. Check there are no gas leaks in pilot
tubing
6
Flame sensed out of
normal sequence
Control circuit is sensing
flame rectification when there
should be none.
1. Check gas valve
2. Check all electrical connections are tight
18
Electronic failure
Control believes it is defective 1. Try reset by cycling power or push any
key
2. Check wiring to pilot and main valve
3. Control requires replacement
23
Flame sensed
during Pre-purge
Primarily for induced draft
models although present in
vent damper software. Pilot
is being sensed to soon in
ignition sequence.
1. Check gas valve
2. Check all electrical connections are tight
24
Flame sensed
during Post-purge
Primarily for induced draft
models although present in
vent damper software. Pilot
is being sensed to late in
shutdown sequence.
1. Check gas valve
2. Check all electrical connections are tight
32
Temperature sensor
failure
Temperature sensor is not
providing expected reading.
1. Check sensor is plugged into control
board
2. Check sensor wiring is not damaged
3. Scroll display reading to "bt" and hold
sensor bulb securely in you hand. It
should read a temperature close to body
temperature. If not, replace sensor.
55
Damper end switch
failed to close
Vent damper must confirm it
is open (switch closes to do
this). Control did not receive
this signal after waiting one
minute, and is still waiting.
1. Check vent damper harness is securely
connected to both vent damper and
control board.
2. Check vent damper harness is not
damaged.
3. Check vent damper mechanism is
operating freely.
4. See Appendix B
56
Damper end switch
failed to open
Vent damper must confirm
it is closed (switch opens
to do this) after a heat call.
The control did not receive
this signal after waiting one
minute, and is still waiting.
1. Check vent damper harness is
connected to both vent damper and
control board.
2. Check vent damper harness is not
damaged.
3. Check vent damper mechanism is
operating freely.
4. See Appendix B
57
Flame rod shorted
to burner ground
Control did not detect a
voltage difference between
flame sense wire and ground.
1. Check flame sense wire on pilot
assembly is not frayed or damaged. If
so, replace pilot assembly.
Note! These are high temperature wires.
DO NOT attempt field repair.
2. Check there is no moisture collecting on
the control board.
58
AC line frequency
error
AC frequency is incorrect or
noisy.
1. Some electric or electronic devices may
generate electromagnetic interference.
Verify none is present.
2. Check thermostat connection.
APPENDIX A - CONTROL MODULE
PN 240012807, Rev. C [11/15/2020]
