Specifications

46
stcudorP retaW htimS .O .A Service Workbook
Ashland City, Tennessee 2005© Training Department
FAULT CONDITIONS CATEGORIZED BY BOILER
CALL-FOR-HEAT/PRE-CIRCULATE STATE
Limit String Fault: During call-for-heat/pre-circulate, if the Control senses a limit string fault, the
Control will wait 60 seconds (nominal) for the fault to clear. If after 60 seconds the Control still senses
a limit string fault, the Control will determine the exact fault condition, and then enter the lockout mode.
The appropriate LED will illuminate and an error code is displayed. If applicable, a Red stage LED will
illuminate. The appropriate LED(s) will remain illuminated until the Control receives a manual reset, or
if a soft lockout has occurred, one hour after the fault occurred. [ Ex: circulation (Flow Switch) LED
"ON". Circulation fail LOCO 030 - on display.]
Temperature Probe Fault: During call-for-heat/pre-circulate, 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 wait 60 seconds (nominal) for the fault to clear. If after 60 seconds the
Control still senses a temperature probe fault, the Control will determine the exact fault condition, and
then 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.
PRE-PURGE STATE
Limit String Fault: During pre-purge, if the Control senses a limit string fault, the Control will wait 5
minutes (nominal) for the fault to
clear. If after 5 minutes the Control still senses a limit string fault, the
Control will determine the exact fault condition, and then enter the lockout mode. The appropriate LED
will illuminate and an error code is displayed. If applicable, a Red stage LED will illuminate. The
appropriate LEDs) 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: During pre-purge, if the Control senses an open or shorted temperature
sensor in the controlling temperature probe, or in the Appliance Max, Temperature Probe (Outlet Probe),
the Control will wait 5 minutes (nominal) for the fault to clear. If after 5 minutes the Control still senses
a temperature probe fault, the Control will determine the exact fault condition, and then
enter the lockout
mode. The appropriate LED(s) 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.
IGNITER WARM-UP STATE
Limit String Fault: During igniter warm-up, 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,
a Red stage LED will illuminate. The appropriate LED(s) will remain illuminated until the Control receives
a manual reset, or if a soft lockout has occurred, one hour after the fault occurred.
Igniter Failure: After detecting a failure, the blower associated with the stage in which the failure
occurred will remain running. The stage will 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 seconds (nominal)
post-purge, and the pump will function per the programmed post-circulate time. The Control will proceed
to a hard lockout. The red igniter Failure LED will illuminate and the display will show an error code