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Weak or intermittent spark
Flame Loss
No flame/Ignition failure
Flame out of sequence
Furnace does not ignite and main blower runs
continuously
Y
G
W2
W1
R
C
B (COM)
Make sure the furnace frame is grounded to earth ground. Ensure the common of the 24 VAC is grounded to Earth ground. Check or replace the spark
igniter. Check the primary and secondary voltage of the transformer for proper voltage.
• Check for bad or dirty flame sensor
• Check thermostat
• Check for proper flame sense signal at flame sense test pins
• Check for proper earth ground on furnace.
• 4 flame losses in a single heat call will put the control into a one-hour lockout.
• Check the thermostat
• Check the pressure switch
• Check gas valve operation
• Check for good spark & check for good earth ground
Flame out of sequence represents a scenario where flame is sensed while the gas valve is closed. The control goes into a lockout state when flame is out
of sequence and the indicator LED blinks the appropriate code (see "lockout" section).
• Check and replace flame sensor
Check the high temperature limit switch for open circuit. Check all safeties. Clean or replace air filter. Check duct work and return air ducts for blockages.
ICM2915
Y
MADE IN THE USA
G
W2
W1
F1
R
B
CONNECTION DIAGRAM
K1
K2
K3
LO
HI
PS (IN)
ROS
GV
PS
LEGEND
24 VAC common
B
LIM
24 VAC common
C
PRI
Electonically commuted motor
ECM
PS
Fuse
F1
R
Flame sensor
FS
ROS
Ground
GND
SEC
Gas valve
GV
Induced draft motor
IDM
K1, K2, K3 Gas valve relays
WIRING DIAGRAM
0 45
STATUS
COOL
HEAT
60
90
LED1
NC
NO
LIM (OUT)
LIM (IN)
FS
Flame
Sensor
ROS
LIM
Limit switch
Transformer primary
Pressure switch
24 VAC
Roll out switch
Transformer secondary
R
B
IDM
L1
PRI
230 VAC
SEC
R
24 VAC
Spark
Electrode
Earth
Ground
SEC
(C)
24 VAC
PRI
230 VAC
Chassis
Earth
Ground
Ground
9-PIN CONNECTION
1. Stage two of gas valve (HI)
2. Stage one of gas valve (LO)
3. Pressure switch in
4. Flame sensor
5. N/A
6. Fusible link (Roll out switch)
7. Common (24 VAC), B
8. Limit switch (out)
9. Limit switch (in)
L2
C
Earth
Ground
(R)
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