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11 NO PREVIOUS CODE – Stored codes
are erased
after 72 hours. On RED LED
boards stored status codes can also be
erased whenever power (115V or 24V)
is interrupted. Run system through a
low-heat, high-heat, or cooling cycle to
chec
k system.
12 BLOWER ON AFTER PO
WER UP –
(115V OR 24V) – Normal operation.
Blower runs for the selected bl
ow
er off-
delay, if unit
is powered up during a cal
l
for heat (R-W/W1 closed) or when (R-
W/W1 opens)
during t
he
blower on-delay
per
iod.
13 LIMIT CIRCUIT LOCKOUT – Lo
ck
out
occurs if the limit or flame rollout switch
is open longer than 3 minutes. Control
will auto-reset after 3 hours
. See code 33.
Flame rollout switch requires manual reset.
14 IGNITION LOCKOUT – System failed to
ignite gas and prove flame in 4 attempts.
Control will auto-reset after 3 hours. See
status code 34.
21 GAS HEATING LOCK
OUT –
Tu rn off
power and wait 5 minutes to retry.
Chec
k for:
- Stuck closed gas v
alve relay on
control.
- Miswire or short to gas valve wire.
22 ABNORMAL FLAME-PROV
I
NG SIGNAL
Flame is prov
ed while gas valve is de-
energized. Inducer will run until
fault is
cleared. Check for:
-Stuck open or leaky gas valve
.
23 PRESSURE SWITCH DID NOT OPEN
Check f
or
:
- Obstructed pressure tube.
- Pressure switch stuck closed.
24 SECONDARY VOLTAGE FUSE IS
OPEN Check for:
- Short circuit in secondary voltage
(24V) wiring including thermostat
leads.
Disconnect thermostat leads
to isolate short circuit.
31 HIGH-HEAT PRESSURE SWITCH OR
RELAY DID NOT CLOSE OR
REOPENED - Chec
k for:
-C
ontrol relay may be defective.
- Gas valve is miswired.
-See status code 32.
32 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
bl
ower off-
delay. Check for:
-Proper vent sizing.
- Low inducer v
oltage (115V).
-Low i
nlet gas pressure (if LGPS used).
- Inadequate combustion air supply.
- Disconnected or obstructed pressure
tubing.
- Defective inducer motor.
-Def
ective pressure switch.
- Excessive wind.
- Restricted vent.
33 LIMIT CIRCUIT F
AU
LT – Indicates the
limit or flame rollout switch is open.
Bl
ow
er will run for 4 minutes or until
open s
witch remakes whichever is
longer. If open longer than 3 minutes,
code changes to lo
ckout #13. If open
less than 3 min. status code #33
continues to flash until blower shuts off
.
Flame rollout switch requires manual
reset. Check for:
-D
irty filter or restricted duct system.
- Loose bl
ower wheel.
-Defective switch or co
nnections
.
- Defective b
l
ow
er motor or capacitor.
- Inadequate combustion air supply
(flame rollout switch open).
- Restricted vent.
- Proper v
ent sizing.
- Excessiv
e wind.
34 IGNITION PROVING FAILURE
– If flame
is not sensed dur
ing the tr
ial f
or ignition
per
iod, the control
will repe
at the
ignition
sequence 3 more times before lo
ck
out
#14 occurs. If flame sign
al is lost during
the blower on-delay period, blower will
come on for
the selected
bl
ower off-delay.
Check the f
ollowing items first bef
ore
proceeding to the ne
xt step
.
-G
as valve turned off.
-M
anual shut-off valve.
- Green/Yell ow wire MUST be connected
to furnace sheet metal.
- Flame sensor must not be grounded.
To determine whether the problem is in
the gas v
alve, igniter, or flame sensor
the system can be operated in the
component test mode to check the igniter.
First
remove the R thermostat connection
from the control and initiate the
component test sequence
.
Does the
igniter glow orange/white by the
end of
the 15 second warm-up period?
43 LOW-HEAT PRESSUR
E SWITCH OPEN
WHILE HIGH-HEA
T PRESSURE
SWITCH IS CLOSED - Check for:
- Low-heat pressure switch stuck open.
-D
isconnected or obstr
ucted pressure
tube.
-M
iswired pressure s
witches.
-Low inlet gas pressure (if LGPS
used).
Unplug igniter harness from control and
initiate another component test sequence.
Chec
k for 115V between pin 1 and
NEUTRAL-L2 on the co
ntrol. Was 115V
present for the 15 second period?
Reconnect the R ther
mostat lead and set
therm
ostat
to call for heat. Connect voltmeter
across gas valve connections. Does gas
valve receive 24V?
Does gas valve open and allow gas to flow?
Do the main bur
ners ignite?
Do the main burners stay on?
Repeat call for heat and check flame sensor
current during trial for ignition period. Is the
DC microamps below 0.5?
Clean flame sensor with fine steel wool and
recheck current. Nominal current is 4.0 to
6.0 microamps.
Fixed.
45 CONTROL CIRCUITRY LOCKOUT Auto-
reset after 1 hour lockout due to:
- Flame circuit failure.
- Gas valve relay stuck open.
- Software check error.
Reset power to clear lockout. Replace
control if code repeats
.
Replace fur
nace control.
Check
f
or
continuity in the harness and igniter.
Replace defective component.
Check connections.
If OK, replace control.
Check that all gas valves are turned on.
Replace valve.
Check for:
- Inadequate flame carryover or rough
ignition.
- Low inlet gas pressure.
-P
roper fir
ing rate.
Allow b
lower to come
on and repeat te
st to
check for intermittent operation.
Chec
k connectio
ns and retry. If current is
near typica
l value (4.0-6.0 nominal) and
bu
rners will not stay on, repeat check in hi
gh-
heat. If burners will still not st
ay on replace
control. If burners operate in high-heat then
switch
to low-heat
, chec
k mani
fo
ld pr
essure.
If OK, check burner carr
yov
er and flame
sensor location.
NO
YES
YES
YES
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
NO
NO
Replace el
ectrode.
Is current near typical value?
NO
Replace furnace control.
Will main burners ignite
and stay on?
A05095
Copyright2009Ca rrierCorp.S 7310W.Morris St.S Indianapolis,IN 46231 Printed inU.S.A. EditionDate:09/09
Manufacturer reserves therighttochange,at anyti me, specifications anddesigns withoutnotice andwithout obligations.
Catalog No: 58MEC---01SM
Replaces:NEW
58MEC