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O
T
The
MNI
HERM
Fault
Fault
Fault Description
Category
Number
Fuel/Air
38
FARMOD target (S2a)
not reached
Fuel/Air
39
FARMOD EEPROM
communication
Fuel/Air
42
FARMOD S1 pre-ignition
air level
Fault
Fault
Fault Description
Category
Number
Fuel/Air
43
FARMOD light-off S2a
level
Fuel/Air
44
FARMOD light-off S2b
level
Fuel/Air
45
FARMOD EEPROM
factory data corrupted
Fuel/Air
50
Fuel/Air Correction Curve
Max not defined
Detailed Description
The Fuel/Air Ratio redundant gas pressure signal was not
within the control setpoint window within the specified time of
30 seconds.
This fault can occur independently or in combination with
fault 34.
Fuel/Air Module has separate storage which is does not
respond to read request. Storage contains module-specific
calibration data essential for correct device operation. This
can be caused by incorrect wiring or Fuel/Air Module
damage.
The S1 pre-ignition air level is below or above the Recorded
Ign. Air Level by the threshold values.
The S1 pre-ignition threshold values are programmed as X%
below and Y% above the Recorded Ign. Air Level on the
OEM Setup screen.
X%=S1 pre-ignition lower threshold. Default=80%.
Y%=S1 pre-ignition upper threshold. Default=120%.
This can be caused by a change in ignition load, change in
ignition fan speed, wind attack or blockage of the appliance
air supply.
Detailed Description
The Fuel/Air Ratio Module S2a value was outside the
commissioned window.
This can be caused by a change in ignition load or ignition
fan speed.
The Fuel/Air Ratio Module S2b value was outside the
commissioned window.
This can be caused by a change in ignition load or ignition
fan speed.
The factory stored data inside the Fuel/Air Module is
corrupted, contact your OEM for advice.
This fault is ignored when the Installer or OEM are logged
into the valve.
If the curve maximum was not defined during commissioning
and commissioning mode is exited, the valve will lockout on
this fault.
Remediation Steps
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 in combination with fault 34 (FARMOD target (S2b) not reached),
it indicates low gas supply pressure for the asked capacity.
1.) Check gas supply pressure to appliance.
2.) Check Fuel/Air Module signal connections for proper engagement..
3.) Reset valve and burner management system, monitoring for proper operation.
4.) If fault persists, replace Fuel/Air Module.
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.
7.) Reset valve and burner management system, monitoring for proper operation.
If this fault occurs independently, the Fuel/Air Module is corrupt:
1.) Replace Fuel/Air Module.
2.) Accept new Fuel/Air Module on the FARMOD tab in the Setup & Tests menu.
3.) Recommission partially or fully as desired.
4.) Reset valve and burner management system, monitoring for proper operation.
If fault persists, replace valve and re-commission.
1.) Check the electrical connection of main and Fuel/Air modules.
2.) Reset the valve and the burner management system.
3.) If fault persists replace Fuel/Air Ratio module.
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.
If ignition load has changed:
1.) Recommission light off sequence.
2.) If fault persists, perform steps below.
If ignition fan speed change is known/suspected:
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.) If fault persists, recommission light off sequence. Record new pre-ignition air proving values by
checking the Record Ign. Air Level box on the Ignition Setup page once system is stabilized.
6.) If fault persists, replace Fuel/Air Ratio Module.
7.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
Remediation Steps
8.).Recommission partially or fully as desired.
9.) If fault persists, replace valve and re-commission.
When combined with fault 42 and/or 44 its an indication the fan speed is wrong or there are flue
system issues.
High values=fan speed wrong or flue disconnected
Low values=fan speed too low, HX blocked or flue blocked
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.) If fault persists, recommission light off sequence. Record new pre-ignition air proving values by
checking the Record Ign. Air Level box on the Ignition Setup page once system is stabilized.
6.) If fault persists, replace Fuel/Air Module.
7.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
8.).Recommission partially or fully as desired.
9.) If fault persists, replace valve.
If fault appears independently, the likely cause is a corrupt S2a sensor inside the FARMOD.
1.) Reset valve and burner management system.
Page 3 of 13
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.
5.) If fault persists, replace valve and re-commission.
When combined with fault 42 and/or 44 its an indication the fan speed is wrong or there are flue
system issues.
High values=fan speed wrong or flue disconnected.
Low values=fan speed too low, HX blocked or flue blocked.
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.) If fault persists, recommission light off sequence. Record new pre-ignition air proving values by
checking the Record Ign. Air Level box on the Ignition Setup page once system is stabilized.
6.) If fault persists, replace Fuel/Air Ratio Module.
7.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
8.).Recommission partially or fully as desired.
9.) If fault persists, replace valve.
If fault appears independently, the likely cause is a corrupt S2b sensor inside the FARMOD.
1.) Reset valve and burner management system.
2.) If fault persists, replace Fuel/Air 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.
5.) If fault persists, replace valve and re-commission.
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.
Commission the Fuel/Air curve, ensuring the maximum firing rate is entered.
Page 4 of 13
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