84 RT-SVP011E-EN
Troubleshooting
Comm Loss: External
Auto Stop
Unit
Immediate
Shutdown
Latching
Continual loss of communication between the
Symbio™ 800 and the LLID/Hex IO has occurred for
a 30 second period.
Unit operation is terminated immediately.
Circuit X is inhibited.
Remote
Comm Loss: EXV 1
CktX
where X = “1” or “2”
Circuit
Immediate
Shutdown
Latching
Continual loss of communication between the
Symbio™ 800 and the EXV has occurred for a 30
second period, or EXV Steps Maximum Position has
not been received.
If EXV Steps Maximum Position has not been
re
ceived, the controller will periodically request EXV
Steps Maximum Position, since it is only transmitted
upon request.
Remote
Comm Loss: Final Filter
Pr
essure Sensor
Unit Warning Non-Latching
Continual loss of communication between the
Symbio™ 800 and the LLID/Hex IO has occurred for
a 30 second period.
No unit response.
Remote
Comm Loss: Heat
Control Board Manf X
where X = “1” or “2”
Heat Warning Non-Latching
Continual loss of communication between the
Symbio™ 800 and the MODBUS
®
Server (heat
control board) has occurred for a 30 second period.
All burners on the manifold are locked out.
Remote
Comm Loss: Heat Ctrl
Board Manf 1 Server
Heat Warning Non-Latching
Staged Gas Heat control boards only.
No serial communication with the 1285’s own
MODBUS
®
server control board the manifold.
Any subsequent burners on that manifold are also
locked out. Any prior burners that exist on that
manifold are allowed to continue running.
Remote
Comm Loss: Hot Gas
Bypass Valve Ckt1
Circuit
Immediate
Shutdown
Latching
Continual loss of communication between the
Symbio™ 800 and the LLID/Hex IO has occurred for
a 30 second period, OR Hot Gas Bypass Valve Steps
Maximum Position has not been received.
If Hot Gas Bypass Valve Steps Maximum Position has
not
been received, the controller will periodically
request Hot Gas Bypass Valve Steps Maximum
Position, since it is only transmitted upon request.
Remote
Comm Loss: Local BAS
Inte
rface
Unit Warning Non-Latching
Continual loss of communication between the
Symbio™ 800 and the LLID/Hex IO has occurred for
a 30 second period.
Use last valid BAS setpoints.
Diagnostic is cleared when successful communication
is established with the LonTalk
®
LLID (LCIC) or
BACnet
®
LLID (BCIC).
Remote
Diagnostics Target Severity Persistence Condition / Response Reset Level
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