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Page 118
Fault
Fault
Fault Description
Category
SV2 Fault Codes (continued)
Number
Fuel/Air
52
Fuel/Air Correction Curve
Min not defined
Fuel/Air
54
Fuel/Air motor driver
Fuel/Air
55
Fuel/Air Control Valve
Fuel/Air
56
FARMOD fuel sensor is
stuck
Fuel/Air
60
FARMOD light-off not
commissioned
Fuel/Air
61
Burner load maximum
threshold
Fault
Fault
Fault Description
Category
Number
Fuel/Air
70
FARMOD rough target
(S2a) not reached
Fuel/Air
71
FARMOD EEPROM
image revision
Fuel/Air
72
Motor connection
Fuel/Air
73
FARMOD EEPROM write Fuel/Air Ratio Module EEPROM write error has occurred
Fuel/Air
79
FCV Failure
Fuel/Air
83
FARMOD flow sensor
(S2b) out of range
Fuel/Air
84
FARMOD EEPROM
(commissioning) data
corrupted
Fuel/Air
86
FARMOD Factory
Calibration data invalid
Fuel/Air
88
Control Valve Full Stroke
Undefined
Detailed Description
This fault is ignored when the Installer or OEM are logged
into the valve.
If the curve minimum was not defined during commissioning
and commissioning mode is exited, the valve will lockout on
this fault.
Fuel/Air stepper motor fault signal is active due to possible
overheat or electrical short.
Fuel/Air Control valve is stuck. This means that gas
regulation does not work correctly.
The Fuel/Air Ratio Module flow sensor returns a fixed value
to the valve electronics. During normal operation the signal
is fluctuating. The missing fluctuation of the signal indicates
a fault in the sensor.
No values were recorded for the Fuel/Air Ratio pre-ignition
air proving values.
This fault is ignored during commissioning if the Record Ign.
Air Level box is checked on the Ignition Setup screen.
During curve commissioning, the S1 threshold is hard-coded
at 6000. If S1 rises above 6000, this fault occurs, but does
not cause a lockout.
During normal run mode, the S1 threshold is programmed
as Y (or at least 25 counts) above the S1 maximum
commissioned Installer Correction Curve value.
Y is programmed in the OEM Setup parameters via the S1
Detailed Description
maximum threshold (%) parameter. The default is 120%.
The Fuel/Air Ratio Module redundant gas pressure signal
was not within the control setpoint rough window within the
specified time of 10 seconds.
This fault can occur independently or in combination with
fault 35.
Fuel/Air Ratio Module EEPROM image revision does not
match valve firmware.
Stepper motor is not connected, or motor current is outside
its specified range.
unexpectedly.
Fuel Control Valve has failed to calibrate.
Fuel/Air Ratio Module flow S2b sensor value out of range
Fuel/Air Ratio Module EEPROM (commissioning) data
corrupted
Fuel/Air Ratio Module does not contain valid factory
calibration data.
The full stroke of the control valve is not defined.
LAARS Heating Systems
Remediation Steps
Commission the Fuel/Air curve, ensuring the minimum firing rate is entered.
1.) Remove power from valve and allow fuel/air stepper motor to cool down for a minimum of 5 minutes in
case of an overheat situation.
2.) Reset valve and burner management system, observing valve / burner operation.
Remove power and shut-off gas supply as necessary.
3.) Remove valve front electrical enclosure and verify the stepper motor terminating connector is fully
inserted in the socket labeled 'MOTOR' in the electrical enclosure. Replace electrical enclosure.
5.) Reset valve and burner management system, observing valve / burner operation.
6.) If fault persists, replace valve main electronics.
7.) If fault persists, replace valve and re-commission.
Remove power and shut-off gas supply.
1.) Remove valve front electrical enclosure and inspect Motor connection for wire engagement, seating,
pin engagement and cleanliness. Correct any errors. Replace electrical enclosure.
2.) Verify ambient temperature meets valve specifications.
3.) Restore power and gas supply. Reset valve and burner management system, monitoring for proper
operation.
4.) If fault persists, replace valve and re-commission.
5.) If fault persists, replace valve electronics.
1.) Replace Fuel/Air Module.
2.) Reset valve and burner management system.
3.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
4.). Recommission partially or fully as desired.
1.) Commission the light-off sequence by logging in as OEM or Installer. Record new pre-ignition air
proving values by checking the Record Ign. Air Level box on the Ignition Setup page once system is
stabilized.
2.) Reset valve and burner management system.
1.) Check that air duct is clear free of any foreign bodies and pollution.
2.) Check that blower is running at a proper rate.
3.) Check Fuel/Air Module signal connections for proper engagement.
4.) Reset valve and burner management system.
5.) Recommission Fuel/Air curve.
6.) If fault persists, replace Fuel/Air Module.
7.) Reset valve and burner management system.
8.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
9.) Recommission partially or fully as desired.
Remediation Steps
10.) Reset valve and burner management system, monitoring for proper operation.
If this fault occurs directly after commissioning:
1.) Recommission the 4 points of the correction curve and/or add additional points to the correction curve.
If the fault persists or if it occurs with fault 35 (FARMOD rough target (S2a) not reached), it is an
indication the modulation speed is too high.
1.) Check gas supply pressure to appliance.
2.) Check Fuel/Air Module signal connections for proper engagement.
3.) Reset valve and burner management system,
4.) Check/lower appliance/burner modulation speed (by decreasing fan control P factor or limiting its RPM
change per time unit).
5.) If fault persists, replace Fuel/Air Module.
6.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
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7.) Recommission partially or fully as desired.
8.) Reset valve and burner management system, monitoring for proper operation.
9.) If fault persists, replace valve and re-commission.
1.) Replace Fuel/Air Ratio Module with a correct version.
2.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
3.) Recommission partially or fully as desired.
1.) Check the stepper motor and valve main electronics board connection.
2.) Reset the valve and the burner management system, monitoring for proper operation.
3.) If fault persists, replace valve main electronics board. Perform Valve Production Cloning procedure
first, accessed via Setup & Tests menu.
4.) If fault persists replace the valve and re-commission.
1.) Reset the valve, monitoring for proper operation
2.) If fault persists replace Fuel/Air Ratio Module.
3.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface..
4.).Recommission partially or fully as desired.
Remove power and shut-off gas supply.
1.) Remove valve front electrical enclosure and inspect Motor connection for wire engagement, seating,
pin engagement and cleanliness. Correct any errors. Replace electrical enclosure.
2.) Restore power and gas supply.
3.) Reset valve and burner management system, monitoring for proper operation.
4.) If fault persists, replace valve and re-commission.
1.) Reset valve and burner management system, monitoring for proper operation.
2.) Check system filter for clogging and replace as necessary.
3.) If fault persists, replace Fuel/Air Ratio Module.
4.) Reset valve and burner management system.
5.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
6.). Recommission partially or fully as desired.
1.) Attempt a complete Fuel/Air valve commissioning.
2.) If fault persists, replace Fuel/Air Module.
3.) Reset valve and burner management system.
4.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
5.) Recommission partially or fully as desired.
6.) Reset valve and burner management system, monitoring for proper operation.
1.) Replace Fuel/Air Ratio Module.
2.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
3.) Recommission partially or fully as desired.
4.) Reset valve and burner management system, monitoring for proper operation.
Replace the valve and re-commission.
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