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Fig. 15—Service Label
A99108
COMPONENT TEST
STATUS CODE EXAMPLE
11 NO FAULT IN RECENT HISTORY DISPLAY - Indicates no faults have occurred within last five cycles.
To read recent fault history put setup switch "SW-1" in the "ON" position. To clear recent fault
history, put setup switch "SW-1" in the "ON" position and jumper thermostat terminals
"R", "W/W1", and "Y/Y2" simultaneously until an "11" is flashed.
12 BLOWER CALIBRATION LOCKOUT - Indicates RPM calculated for low heat was less than 250 RPM
or greater than 1300 RPM on two successive attempts. Auto reset after three hours. Reset
power and refer to fault #44 section.
13 LIMIT SWITCH LOCKOUT - Indicates the occurrence of 10 successive limit trips during high heat
or three successive limit trips during low heat. Auto reset after three hours.
Check for: - Improper or misaligned limit and/or limit shield.
- Improper high or low heat gas input adjustment.
- Stuck high heat solenoid in gas valve.
14 IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.
21 INVALID MODEL SELECTION - Indicates model plug is missing or incorrect. See wiring diagram
for correct connector jumper location.
22 SETUP ERROR - Indicates setup switch "SW-1" or SW-6" is positioned improperly. The following
combinations will cause the fault.
- Thermostat call with "SW-1" "ON".
- Thermostat call with "SW-6" "ON".
-"SW-1" and "SW-6" both "ON" together.
23 INVALID BLOWER AIRFLOW SELECTION - Indicates improper "A/C" or "CF" switch setting. The 042
and 14 units can deliver 1-1/2 to 3-1/2 tons A/C and 600 to 1400 CFM for continuous fan. The
060 and 20 unit can deliver 2 to 5 tons A/C and 800 to 2000 CFM for continuous fan. If code is
flashing unit will default to closest allowable airflow.
24 SECONDARY VOLTAGE FUSE IS OPEN
Check for: - Short circuit in secondary voltage (24V) wiring.
31 HIGH PRESSURE SWITCH FAULT - Indicates high pressure switch is closed at call, or in low heat,
or fails to close after call, or opens in high heat.
Check for: - Plugged condensate drain.
- Water in vent piping, possibly sagging pipe.
- Improper pressure switch wiring or pressure switch tubing connections.
- Failed or "Out-of-Calibration" pressure switches.
32 LOW PRESSURE SWITCH FAULT - Indicates low pressure switch is closed at call, or fails to close
after call, or opens during operation.
Check for: - Plugged condensate drain.
- Water in vent piping, possibly sagging pipe.
- Improper pressure switch wiring or pressure switch tubing connections.
- Failed or "Out-of-Calibration" pressure switches.
33 LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN - Indicates the limit, rollout switch or auxiliary limit
switch is open or the unit is operating in high heat only mode due to two successive low heat
limit trips. Check for: - Improper or misaligned limit and/or limit shield.
- Improper low heat gas input adjustment.
- Stuck high heat solenoid in gas valve.
34 IGNITION PROVING FAULT - Control will try three more times before a lockout #14 occurs.
Check for: - Gas valve defective or gas valve turned "OFF".
- Defective Hot Surface Ignitor - Manual valve shut-off.
- Low inlet gas pressure
- Green wire MUST be connected to furnace sheet metal.
- Proper flame sense microamps (.5 microamps D.C. minimum, 4.0 - 6.0 nominal HIGH HEAT)
- Inadequate flame carryover or rough ignition.
- Oxide buildup on flame sensor (clean with fine sandpaper.)
41 BLOWER OUTSIDE VALID SPEED RANGE - Indicates the blower is not operating at the calculated
RPM. If this fault occurs in conjunction with fault #44 check wiring to motor otherwise refer to
the trouble-shooting guide.
42 INDUCER OUTSIDE VALID SPEED RANGE - Indicates the inducer is not operating at the
calculated RPM, or has not started within 10 seconds after a call for heat. Check wiring to
motor otherwise refer to the trouble-shooting guide.
43 PRESSURE SWITCH CALIBRATION FAULT - Indicates the low and high pressure switch "make"
points during high heat purge are not within the calibration range.
Check for: - Plugged condensate drain.
- Water in vent piping, possibly sagging pipe.
- Improper pressure switch wiring or pressure switch tubing connections.
- Failed or "Out of Calibration" pressure switches.
44 BLOWER CALIBRATION FAULT - Indicates the calculated blower speed is below 250 or above
1300 RPM. Unit will default to low or high heat mode if possible. If this fault occurs in conjunction
with fault #41 check wiring to motor otherwise refer to the trouble-shooting guide. If this fault
occurs by itself check for undersized ductwork, or excessive static caused by a dirty filter, or
closed registers.
=
42 FAULT
HUMGRY/Y2W/W1
C
W2
MALFUNCTION
MICROPROCESSOR
RED LED2
EMER HEAT
RED LED1
(2)
(4)
COUNT THE NO.
OF FLASHES
GREEN LED4
LOW HEAT
YELLOW LED3
HIGH HEAT
4
3
2
1
FUSE
3
21
OFF
32
1
OFF
1
2
3
45678
OFF
SETUP SW,(SW1-8)
EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT
DETERMINED BY NUMBER OF FLASHES OF THE YELLOW LED AND THE SECOND DIGIT
DETERMINED BY NUMBER OF FLASHES OF THE GREEN LED.
RED LED1 ON
Furnace is operating in emergency heat.
RED LED2 ON
The microprocessor has malfunctioned. To reset: Put setup switch "
SW-1
" in the "
ON
"
position and jumper thermostat terminals "
R
", "
W/W1
", and "
Y/Y2
" simultaneously with
the door switch pushed in and power to the unit "
ON
". Disconnect jumper and place
setup switch in the "
OFF
" position. If
LED2
reappears replace main control board.
YELLOW LED3 ON
Furnace is operating in high heat.
GREEN LED4 ON
Furnace is operating in low heat.
RED LED2 FLASHING
Line voltage polarity is reversed.
STATUS
LED CODE
SERVICE
INDUCER OUTSIDE VALID
SPEED RANGE
To initiate the component test sequence, shut "OFF" the room thermostat or disconnect the "R"
thermostat lead. Put setup switch "SW-6" in the "ON" position to start the component test sequence.
Once initiated the main board will turn "ON" the inducer motor-low speed, inducer motor-high speed,
hot surface ignitor, blower motor-low speed, and blower motor-high speed for 15-20 seconds each.
When component test is completed one or more of the following codes will flash. Gas Valve and
Humidifier will not be turned on.
CODE DESCRIPTION
11
Indicates inducer and blower motor tested OK. Visual check of hot surface ignitor required.
22 SETUP ERROR
- Same as code 22 above.
41 BLOWER OUTSIDE VALID SPEED RANGE -
Indicates blower motor failed test. Check blower, wiring,
and controlcenter.
42 INDUCER OUTSIDE VALID SPEED RANGE -
Indicates inducer motor failed test. Check inducer,
wiring and control center.
To repeat component test turn setup switch "SW-6" "OFF" and then back "ON". After component test is
completed put setup switch "SW-6" in the "OFF" position and reconnect the "R" thermostat lead.
320624-101 REV. H
OM
24 V
COUNT THE NO.
OF FLASHES
DE
DEHUM
11