Table 8-1 Fault and Warning Messages
Error
Message Cause
Action
T/C
An open circuit thermocouple has been
detected and no auto-response has been
selected in the T/C Open Error column of the
SetUp page.
For immediate recovery:
• Slave that control zone to an adjacent
zone OR change to open loop control.
• When the controller is free, check to see
whether the input fuse on the control card
has ruptured.
• If the fuse is good, then check the wiring
for faults or replace the thermocouple.
TRC
If a triac fails it goes short circuit and passes
full load current.
In such a condition you have lost control of
the load and cannot switch it off from the
console. The TRC alarm flags up the fault
state which relies on operator intervention to
manually shut the system down.
Note
: The triac monitor does not function
in Auto mode. If the triac fails with the zone
in Auto mode, the only indication will be an
abnormally high zone temperature due to the
triac is passing high, uncontrolled current.
The TRC alarm is only seen if a triac fails on
a zone that is running in closed-loop manual
condition.
• If the triac has failed, return to your
supplier for repair.
Fault and Warning Messages - continued
8-4
M1 Plus Controller User Manual
TROUBLESHOOTING
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