90 RT-SVP011E-EN
Troubleshooting
Emergency Override
Mode Shutdown
Unit Warning Non-Latching The unit is following Emergency Override Shutdown. Local
Emergency Override
Mode Fire
Unit Warning Non-Latching The unit is following Emergency Override Fire. Local
Emergency Stop Unit
Immediate
Shutdown
Latching
Emergency stop feedback input has Opened. Time to
trip from input opening to unit stop shall be 0.1 to 1.0
seconds.
Unit operation is inhibited.
Local
Evap Lvg Air Temp
Sensor
[Single Evaporator]
Evaporator Leaving Air
Temperature EvapX
[Split Evaporator]
where X is “A” or “B”
Unit Warning Latching
The Evaporator Leaving Air Temperature sensor on
the circuit has failed out of range.
The DX cooling continues to run but reheat for
dehumidification is stopped.
Remote
Excessive Outdoor Air Unit Warning Non- Latching
The unit is in any mode that is not active economizer
co
oling. The OAD position has been greater than the
minimum ventilation command by 10% for 5
continuous minutes.
Remote
Final Filter Pressure
Sensor
Unit Warning Non-Latching
The filter pressure sensor has failed.
No unit response.
Remote
Heat Control Board
Failure Manf X Server
where X is “1” or “2”
Heat Warning Non-Latching
Staged Gas Heat control boards only.
A control board failure condition has condition has
oc
curred on the 1285’s own MODBUS
®
server control
board on the first manifold.
Does not lock out any burners associated with the
first heat control board on the manifold.
Remote
Heat Gas Valve Failure
Manf X Burner Y
where X is “1” or “2”
where Y is “1”, “2” or “3”
Heat Warning Non-Latching
Possible causes: Faulty wiring. Faulty control.
Mod Gas control boards: The Valve Actuator did not
reach a Park or Full On position. All burners on the
manifold are unavailable until the condition is
corrected. Will allow another retry 10-30 seconds
after the error condition is created, and the error
condition is cleared.
Staged Gas Control Boards:
The gas valve state is lo when it must be hi, or hi when
it mus
t be lo.
All burners on the manifold are unavailable until the
condition is corrected. Will allow another retry 10
minutes after the error condition is created, and the
error condition is cleared.
Remote
Heat Gas Valve Short
Ma
nf X Burner Y
where X is “1” or “2”
where Y is “1”, “2” or “3”
Heat Warning Non-Latching
The burner gas valve is shorted to 24VAC.
All burners on the manifold are unavailable until the
co
ndition is corrected. Will allow another retry 10
minutes after the error condition is created, and the
error condition is cleared.
Staged Gas Heat control boards only.
Possible causes: Control needs to be replaced. Faulty
wiri
ng.
Remote
Diagnostics Target Severity Persistence Condition / Response Reset Level
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