RT-SVP011E-EN 35
TD7 Display
Heat Air Pressure Reading Low Manf 1
Pressure switch failed to open or insufficient air/blocked vent. Includes
air switch failure to open during pre-purge switch check. All burners on
all manifolds are unavailable. Will allow another retry in 10 - 30 seconds
after the error condition is created, and the error condition is cleared.
Modulating Gas Heat only.
Heat Air Pressure Reading High Manf 1
Includes air switch failure to close during pre-purge switch check. All
b
urner
s are unavailable. Will allow another retry in 10 - 30 seconds after
the error condition is created, and the error condition is cleared.
Modulating Gas Heat only.
Heat Air Sensor Out Of Tolerance Manf 1
The Air Pressure sensor zero reading appears to be out-of-tolerance.
Modulating Gas Heat only.
Heat Derate - Insuff Comb Air Manf 1
Blocked vent with actuator position derated by >20% from FRI setting.
Modulating Gas Heat only.
Heat Failed Ignite Delay Manf X Burner Y
The number of failed burner ignition attempts exceeds a certain
thr
eshold.
Burner is temporarily unavailable. Any subsequent burners
on that manifold are also temporarily unavailable. Any prior burners
that exist on that manifold may continue running. Will allow another
retry 60 minutes after the error condition is created, and the error
condition is cleared.
Possible causes: Insufficient gas line pressure. Faulty gas valve. No
sp
ark from s
park igniter. Improper flame rod connection. Improper
placement of spark igniter/flame rod.
Heat Ignite Attempt Fail Manf 1 Burner 1
Ignition attempt was unsuccessful. Control board will attempt to
reignite if
number of re-ignition attempts has not been exceeded.
Modulating Gas Heat only.
Heat Lost Flame Delay Manf X Burner Y
The number of lost flame conditions exceeds
a certain threshold. Burner
is temporarily unavailable. Any subsequent burners on that manifold
are also temporarily unavailable. Any prior burners that exist on that
manifold may continue running. Will allow another retry 60 minutes
after the error condition is created, and the error condition is cleared.
Staged Gas Heat only.
Possible causes: Dirty/faulty flame rod. Improper burner component
in
stallation.
Low gas pressure.
Heat Lost Flame Manf 1 Burner 1
Ignition was successful but then flame disappeared. Control board will
attempt to r
eignite.
Modulating Gas Heat only.
Heat Primary Limit Open Manf X
Primary limit is open. Could be due to
the Roll ou
t switch or an over-
temp condition on the Tstat. All burners on all manifolds are unavailable
until all elements on the primary limit are closed.
Modulating Gas Heat: Mode will clear 10 - 30 seconds after the error
condition
is created, and the error condition is cleared.
Staged Gas Heat: Mode will clear 10 minutes after the error condition
is created,
and the error condition is cleared.
Possible causes: Air flow filters. Duct sizing. Faulty blower.
Heat Primary Limit Open Manf 1 Server
Primary limit condition has occurred on a g
as heat control board, which
is a MODBUS
®
server to another gas heat control board. Mode will clear
10 minutes after the error condition is created, and the error condition
is cleared.
Table 7. Unit operation - top level mode - auto (continued)
Unit Description
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