10.1 L1 POLARITY FAULT
Rapid flash LED
10.2 Refrigerant leak detected, operate blower.
12.1 “W” ON at power up – Normal operation.
Blower runs for 90 seconds, if unit is powered
up during a call for het (R-W closed) or when
(R-W opens) during the blower on-delay period.
13.1 LIMIT CIRCUIT LOCKOUT – Lockout occurs
if the limit, draft safeguard, flame rollout, or
blocked vent switch*(if used) is open longer
than 3 minutes. Control will auto-reset after
3 hours. See code 33.
14.1 IGNITION LOCKOUT – System failed to
ignite gas and prove flame in 4 attempts.
Control will auto-reset after 3 hours. See
status code 34.
14.2 FLAME LOST – 3 times after 70s of heating
14.3 LOCKOUT – 7 loss of flame events during a
heat request
14.4 LOCKOUT – 7 pressure switch open events
during a heat request
21.1 24VAC sensed on gas valve when shouldn’t
be. – Turn off power and wait 5 minutes to
retry.
Check for:
- Stuck closed gas valve relay on control.
- Miswire or short at gas valve wire.
22.1 FALSE FLAME – Flame is proved while gas
valve is de-energized. Inducer will run until
fault is cleared.
Check for:
- Stuck open or leaky gas valve.
31.6 OPEN SECONDARY PRESSURE SWITCH – HPS did
not close for one minute after gas valve closed or has
reopened.
31.7 HIGH HEAT ONLY for next cycle- HPS failed to close in
75s when transitioning from low to high heat.
Check for
- Failed to close secondary pressure switch after three
trials
- Excessive wind
- Restricted vent
- Defective inducer motor
- Low inlet gas pressure (if LGPS used)
- Inadequate combustion air supply
- Proper vent sizing
- Disconnected or obstructed pressure tubing
- Condensate drainage restricted or blocked
If it opens during blower on-delay period, blower will come on for
the selected blower off-delay.
33.1 A SWITCH HAS OPENED IN THE MAIN LIMIT –
Indicates the limit or flame rollout is open. Blower will
run for 4 minutes or until open switch remakes whichever
is longer. If open longer than 3 minutes, code changes
to lockout #13. If open less than 3 min. status code #33
continues to flash until blower shuts off. Flame rollout
switch and BVSS requires manual reset.
Check for (applies to all):
- Dirty filter or restricted duct system
- Loose blower wheel
- Defective switch or connections
- Defective blower motor
- Improper gas input adjustment
45.1 CONTROL FAILURE – flame circuit
fault, memory mismatch or sequence
error.
45.2 CONTROL FAILURE – gas valve relay
will not close.
45.3 CONTROL FAILURE – EEPROM memory
issue.
45.4 CONTROL FAILURE – Micro loss of
Comm
For code 45, cycle power, if code 45 repeats,
replace control.
Only the MAJOR flash code is seen through the sight glass on door.
32.2 OPEN MAIN PRESSURE SWITCH – If LPS is open
longer than 5 minutes or has reopened, inducer shuts off
for 15 minutes before retry. If opens during blower on-
delay period, blower will come on for the selected blower
off-delay. On two-stage furnaces, if the low-heat
pressure switch opens within five minutes after the main
gas valve input turned ON, the new heating cycle SHALL
be restricted to high-heat for the next cycle only, even if
low-heat only is selected. 32.2 will continue to be shown
during the forced high heat cycle.
See Code 31.6 and 31.7 for troubleshooting.
52.1 SAT OPEN - Supply Air Tempera ture
sensor connection is open
52.2 SAT SHORT - Supply Air Temperature
sensor wires are shorted
Check for:
- Loose connection at control board screw
terminals.
- Cut or shorted wires to the SAT.
- Damaged SAT sensor
53.1 RAT OPEN - Return Air Temperature
sensor connection is open
53.2 RAT SHORT - Return Air Tempera ture
sensor is shorted
Check for:
- RAT firmly plugged into control board.
- Damaged RAT sensor
41.1 NO BLOWER RPM - No blower rpm at
startup
41.2 NO BLOWER RPM - No blower rpm
when blower motor is running.
41.3 Failed to reach 500 rpm at startup
Check for:
- Loose blower wire connections
- Failed blower motor.
15.1 BLOWER RPM LOCKOUT - Lockout occurs
when no blower rpm is detected.
15.2 LOCKOUT - Failed to reach 500 rpm during
start up
Check for:
- Loose blower wire connections
- Failed blower motor.
43.1 HPS closed before LPS
17.1 Blue Too th Module communicating loss
51.1 OAT OPEN - Outdoor Air Temperature
sensor connection is open
51.2 OAT SHORT - Outdoor Air Temperature
sensor wires are shorted
Check for:
- Loose connection at control board screw
terminals.
- Cut or shorted wires to the OAT.
- Damaged OAT sensor
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