Specifications

48
stcudorP retaW htimS .O .A Service Workbook
Ashland City, Tennessee 2005© Training Department
FAULT CONDITIONS CATEGORIZED BY BOILER
No Gas Valve Power Sensed: After detecting the failure, the blower associated with the stage in
which the failure occurred will proceed to a 15 second (nominal) inter-purge. The stage will then retry
for ignition. If the failure continues after one or three attempts (depending on the trial configuration), all
active blowers will proceed to a 25 second (nominal) post-purge, and the pump will function per the
programmed post-circulate time. The Control will proceed to a hard lockout. The display will show an
error code corresponding to the stage on which the failure occurred. The appropriate LED(s) will
remain illuminated until manual rese
t.
Temperature Probe Fault: If the control detects an open or shorted temperature sensor in the
controlling temperature probe, or in the Appliance Max. Temperature Probe (Outlet Probe), the control
will enter the lockout mode. The appropriate LED will illuminate and an error code is displayed. The
appropriate LED(s) will remain illuminated until the Control receives a manual reset. Unused
temperature probes are not monitored.
POST PURGE
Limit String Fault: During post purge, if the Control senses a limit string fault, the Control will enter the
lockout mode. The appropriate LED will illuminate and an error code is displayed. If applicable, the
Red stage LED will illuminate. The appropriate LED will remain illuminated until the Control receives a
manual reset, or if a soft lockout has occurred, one hour after the fault occurred.
Temperature Probe Fault: if the control detects an open or shorted temperature sensor in the controlling
temperature probe, or in the Appliance Max. Temperature Probe (Outlet Probe), the control will enter
the lockout mode. The appropriate LED will illuminate and an error code is displayed. The appropriate
LED(s) will remain illuminated until the Control receives a manual reset. Unused temperature probes
are not monitored.
flame failure fault condition is written to nonvolatile memory within 4 seconds. The red Flame Failure
LED will illuminate and the display will show an error code corresponding to the stage on which the
failure occurred. The appropriate Red stage LED will also illuminate. The appropriate LED(s) will
remain illuminated until manual reset.