Sv2 Fault Codes - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual

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Fault Fault Fault Description
13.B SV2 Fault Codes
Category Number
Data Error 23 EEPROM corrupt
Data Error 24 EEPROM lockout code
mis-match
Data Error 48 Valve body parameter
missing
Fuel/Air 18 Air flow sensor (S1) out
of range
Fuel/Air 25 FARMOD communication
fault
Fuel/Air 26 Air flow sensor (S1)
frozen
Fuel/Air 27 FARMOD flow sensor
(S2a) frozen
Fuel/Air 28 FARMOD flow sensor
(S2a) out of range
Fuel/Air 30 FARMOD control valve
has reached its lower
limit
Fault Fault Fault Description
Category Number
Fuel/Air 31 FARMOD control valve
has reached its upper
limit
Fuel/Air 32 FARMOD sensor - drift of
flow sensors
Fuel/Air 33 FARMOD mismatch
Fuel/Air 34 FARMOD target (S2b)
not reached
Fuel/Air 35 FARMOD rough target
(S2b) not reached
Detailed Description
Main electronics EEPROM is corrupted.
Main electronics EEPROM lockout code storage value
incorrect.
Valve body parameters not defined in electronics memory.
This may occur when the valve main electronics have been
replaced in the field.
The airflow sensor signal is/was outside the sensor
measuring range (-8000 to 8000).
The bus communication between the Fuel/Air Module and
the valves electronics was/is interrupted.
The air flow sensor returns a fixed value to the valve
electronics. During normal operation the signal is fluctuating.
The missing fluctuation of the signal indicates an fault in the
sensor.
The Fuel/Air flow sensor returns a fixed value to the valve
electronics. During normal operation the signal is fluctuating.
The missing fluctuation of the signal indicates an fault in the
sensor.
The S2a airflow sensor signal is/was outside the sensor
measuring range (-8000 to 8000).
The stepper motor position has reached zero position during
run mode. This can happen if the inlet pressure is relatively
high for the requested minimum gas volume.
Lower the gas inlet pressure to SV2 Series valve or increase
minimum capacity. Practically, the stepper motor position
Detailed Description
should be above 80 steps for the 1.5in and 2in valves and
above 50 steps for the 1in valve. Below these values the gas
flow will change very little with changing motor position.
The Fuel/Air Ratio stepper motor position has reached
maximum open position during run mode. This can happen if
the inlet pressure is relatively low for the requested
maximum gas volume.
Increase the gas inlet pressure to SV2 Series valve or
decrease maximum capacity. Practically, the stepper motor
position should be below 1100 steps for the 1.5in and 2in
(DN40-50) valves and below 550 steps for the 1in (DN25)
valve. Above these values the gas flow will change very little
with changing motor position.
The safety check on the Fuel/Air Ratio Module sensor
signals has failed. If this fault occurs shortly after
commissioning adding points to the correction curve of 4
points or recommissioning the 4 points can help to improve
the performance of the safety check.
The Fuel/Air Module has been replaced by a used Fuel/Air
Module that already contains commissioning data.
NOTE: If this FARMOD is Accepted and used, any
existing data in it will be over-written with the Base
Curve and stepper motor full stroke data from valve.
The Correction Curve and Ign. Air Level will be erased
and must be re-commissioned.
The Fuel/Air Ratio controlled gas pressure was not within
the control setpoint window within the specified time of 30
seconds. Lower the modulation speed of the
appliance/burner to avoid this fault.
This fault can occur independently or in combination with
fault 38.
The Fuel/Air Ratio controlled gas pressure was not within
the control setpoint rough window within the specified time of
10 seconds. Lower the modulation speed of the
appliance/burner to avoid this fault.
This fault can occur independently or in combination with
fault 70.
Remediation Steps
1.) Reset valve and burner management system then cycle power.
2.) If fault persists replace main electronics.
3.) Recommission all valve parameters.
1.) Reset valve and burner management system then cycle power.
2.) If fault persists replace main electronics.
Set valve body parameters by accessing the valve guided setup screens.
1.) Reset valve and burner management system.
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.
Remove power and shut-off gas supply.
1.) Remove valve front electrical enclosure and inspect Fuel/Air module wiring connections for wire
engagement, seating, pin engagement and cleanliness.
2.) Replace cover and reset valve and burner management system when corrected.
3.) Check for a nearby source of strong electro-magnetic interference. Reset valve and burner
management system when corrected.
4.) If fault persists, replace Fuel/Air module.
5.) Reset valve and burner management system.
6.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
7.).Recommission partially or fully as desired.
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.) 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.) Reset valve and burner management system.
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.
Fault indicates gas supply pressure is too high and minimum load is too low.
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.
Remediation Steps
6.) Recommission partially or fully as desired.
7.) Reset valve and burner management system, monitoring for proper operation.
8.) If fault persists, replace valve and re-commission.
If this occurs with fault 34 (FARMOD target (S2b) not reached), its an indication the gas supply
pressure is too low and the maximum load 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, monitoring for proper operation.
4.) If fault persists, replace Fuel/Air Ratio 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.
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7.) Reset valve and burner management system, monitoring for proper operation.
8.) If fault persists, replace valve and re-commission.
1.) Check Fuel/Air Module reference signal connection for proper engagement.
2.) Reset valve and burner management system, monitoring for proper operation.
3.) If fault persists, replace Fuel/Air 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.
7.) Reset valve and burner management system, monitoring for proper operation.
1.) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
Any data in the attached FARMOD will be over-written by data from the valve main electronics.
2.) Recommission partially or fully as desired.
If this occurs with fault 38 (FARMOD target (S2a) not reached), it is an indication the gas supply
pressure is too low.
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.) 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 Ratio Module
6) Accept new Fuel/Air Ratio Module on the FARMOD tab in the Setup & Tests menu of user interface.
7.) Recommission partially or fully as desired.
8.) Reset valve and burner management system, monitoring for proper operation.
8.) If fault persists, replace valve and re-commission.
If this fault occurs with fault 70 (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, monitoring for proper operation.
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.
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.
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