Alarms and Troubleshooting
OAU-SVX006E-EN 69
Table 14. Diagnostic values
Name Manual or Auto Reset Possible Causes
BV-01 Diagnostic: Supply Fan Failure
Manual Reset. Occurs when the
sup
ply fan is commanded on but
the proving switch does not close
after two minutes
• VFD not operating OA and/or RA dampers not operating
properly
• Indoor Fan Motor Failure
• Indoor Fan Failure Switch IFFS (pressure) failure
• IFFS tubing damaged or not properly connected
BV-02
Diagnostic: Discharge Air
H
umidity Source Failure
Auto Reset. Occurs when the
di
scharge air humidity sensor falls
outside of range
• BAS communication down
• Failed sensor or improper sensor installation
• Humidity Wiring Polarity sensitive
BV-03
Diagnostic: Outdoor Air Damper
End
Switch
Auto Reset. Occurs when there is a
call
for the two-position outdoor air
damper but the end switch has no
made for 180 seconds
• No voltage on actuator
• Failed OAD power transformer
• No continuity thru end switch ( check at UC)
BV-06
Diagnostic: Discharge Air
T
emperature Source Failure
Auto Reset. Occurs when the
di
scharge air temperature sensor
falls outside of range
• BAS Communication Down
• Failed sensor or improper sensor installation
BV-08 Diagnostic: Fire Shutdown
Auto Reset. Diagnostic from BAS
communi
cation. Unit resets once
this returns to normal
•BAS only
BV-10
Diagnostic: Low Discharge Air
Te
mp Lockout
Manual Reset. Occurs when the
di
scharge air temperature is below
35°F for five minutes, or ten
minutes during heat pump defrost
mode
• Heat Overridden OFF
• Compressor(s) Overridden ON
• Setpoint Failures Incorrect
• DAT sensor malfunction
BV-11
Diagnostic: Space Temperature
Sou
rce Failure
Auto Reset. Occurs when the space
temperature active falls outside of
ra
nge
• BAS communication down
• Failed sensor or improper sensor installation
BV-13
Diagnostic: Outdoor Air
T
emperature Source Failure
Auto Reset. Occurs when the
outd
oor air humidity active falls
outside of range
• BAS Communication Down
• Failed sensor or improper sensor installation
BV-14
Diagnostic: Outdoor Air Humidity
Sou
rce Failure
Auto Reset. Occurs when the
outd
oor air temperature active falls
outside of range
• BAS communication down
• Failed sensor or improper sensor installation
• Humidity Wiring Polarity sensitive
BV-15
Diagnostic: High Discharge Air
Te
mp Lockout
Manual Reset. Occurs when the
di
scharge air temperature is above
130°F for five minutes
• Heat Overridden ON
• Low discharge air volume
• Dirty Air filters
• High gas heater manifold pressure
• OA/RA damper position incorrect
• High temp limit not properly installed or wired
• DAT sensor malfunction
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