10.1 L1 POLARITY FAULT - Rapid flash LED.
Polarity of incoming 115V power is reversed.
Check for:
- Correct line voltage (115V) wiring polarity at each
junction.
- If units are twinned, check for proper low-voltage
(24V) transformer phasing.
12.1 “W” ON at power up – Normal operation.
Blower runs for 90 seconds, if unit is powered
up during a call for heat (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.
23.1 STUCK MAIN pressure switch
Check for:
- Obstructed pressure tube.
- Pressure switch stuck closed.
31.6 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT
CLOSE OR REOPENED
31.7 HIGH HEAT ONLY FOR NEXT CYCLE - High pressure
switch failed to close in 75s when transitioning from low
to high heat.
Check for:
- Control relay may be defective.
- Gas valve is miswired.
- See status code 32.2
33.1 A SWITCH HAS OPENED IN THE MAIN LIMIT –
Indicates the limit, draft safeguard, flame rollout, or
blocked vent shutoff switch* (if used) 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.
33.2 LOCKOUT - High Heat Only for current cycle.
Check for:
- Dirty filter or restricted duct system
- Loose blower wheel
- Defective switch or connections
- Defective blower motor or capacitor
- Inadequate combustion air supply (flame rollout switch
open)
- Restricted vent
- Proper vent sizing
- Excessive wind
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 - Loss of
communications
For code 45, cycle power, if code 45 repeats,
replace control.
Only the MAJOR flash code is seen through the sight glass on door.
* Blocked vent shutoff switch used in Chimney Adapter Kit
46.1 MOMENTARY LOSS of power –
Heating operation will stop and will
restart once the power fluctuation is
resolved.
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 34.1.
14.2 FLAME LOST LOCKOUT – Flame signal was
lost 3 times after heating blower on delay.
Control will auto-reset after 3 hours. See status
code 34.6 to 34.8.
14.3 FLAME LOST LOCKOUT – Flame signal was
lost 7 times during a single heat request. See
status code 34.6 to 34.8.
14.4 LPS OPEN LOCKOUT – LPS open 7 times
during a single heat request. See status code
34.1
Check for (applies to all):
- Correct manifold pressure and gas firing rate
- Gas inlet pressure fluctuations
- See Code 34 for additional help
32.2 LOW-HEAT PRESSURE SWITCH DID NOT CLOSE OR
REOPENED - If open longer than 5 minutes, 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.
Check for:
- Proper vent sizing
- Low inducer voltage (115V)
- Low inlet gas pressure (if LGPS used)
- Inadequate combustion air supply
- Disconnected or obstructed pressure tubing
- Defective inducer motor
- Defective pressure switch
- Excessive wind
- Restricted vent
43.1 LOW-HEAT PRESSURE SWITCH
OPEN WHILE HIGH-HEAT
PRESSURE SWITCH IS CLOSED
Check for:
- Low-heat pressure switch stuck open.
- Disconnected or obstructed pressure
tube.
- Low inlet gas pressure (if LGPS used).
15.1 BLOWER RPM LOCKOUT - Lockout occurs
when no blower rpm is detected.
Check for:
- Loose blower wire connections
- Failed blower motor.
41.1 NO BLOWER RPM - No blower rpm at
startup
41.2 NO BLOWER RPM - No blower rpm
when blower motor is running.
Check for:
- Loose blower wire connections
- Failed blower motor.
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