Led Fault Codes; Troubleshooting Tips - ICM Controls ICM2812ж ICM2812-KIT Installation, Operation & Application Manual

ICM2812 Timing
Input
Ignition Activation Period
Ignitor Warmup
Inducer Inter-purge
Inducer Post-Purge
Inducer Pre-purge
Trial for Ignition
Trials
Cool Blower OFF delay
Cool Blower ON delay
Heat Blower OFF delay
Heat Blower ON delay
Lockout
LED
Status Description
ON Normal operation
OFF Control board failure
1 Ignition failure (soft lockout)
2 Pressure switch stuck closed
3 Pressure switch stuck open
4 Limit switch fault
5
Flame out of sequence
6 Roll out switch fault
7
Weak flame
8 Mis-wired gas valve
9 Unused
10 Hot and neutral reversed
11 Brownout
18-30 VAC, 60Hz
3 seconds
19 seconds
60 seconds
25 seconds
30 seconds
4 seconds
3
45 seconds
6 seconds
100/150 seconds
30 seconds
60 minutes

LED Fault Codes

N/A
Check for proper input voltage and check the fuse; if not resolved replace the control.
Clean or replace the flame sensor, check the igniter for proper operation & input voltage,
check the transformer's common is grounded to earth ground.
Check for contaminated or defective pressure switch.
Check for obstructed pressure switch tubing or defective pressure switch. Check for
oxidation on terminals, broken wires, or defective inducer motor .
Checked for blocked airflow, blocked ductwork, and dirty filter. Check or replace high limit
switch if defective.
Check for intermittent or defective gas valve and check for dirty or defective flame sensor.
Check for a cracked heat exchanger, defective rollout switch , broken wires on the roll out
switch, or replace roll out switch if required.
Weak flame is caused by carbon build up on the flame sensor, poor grounds, or improper
placement of the flame sensor . Clean or replace the flame sensor, reassure grounds,
ensure the flame sensor is fully enveloped in the flame.
Check for shorted or mis-wired gas valve, check harness wires for any shorts or breaks,
and check the pressure switch for proper operation.
N/A
Check for proper polarity of the incoming voltage on the primary and secondary sides of the
transformer.
A brownout fault indicates a low voltage condition. Check the voltage on the primary
and secondary sides of the transformer and ensure there is no excessive load on the
transformer.
Fault Recall Button
To review the fault history; press and hold the Fault Recall
button and release once the LED goes out. The previous
five fault codes will be displayed. The LED will turn off
momentarily and then go solid after the last fault has been
displayed.
The ICM2812 will not respond to thermostat calls while the
fault history is being displayed.
To clear the fault history; press and hold the Fault Recall
button and release once the LED starts flashing. The LED will
turn off momentarily and then go solid after the fault history
has been cleared.
The fault history will not erase while the ICM2812 is
performing a heating or cooling call.
Trouble Shooting Tips