User Guide

Page 8 of 8
TROUBLSHOOTING
Status Possible Cause Boiler / Control Action(s)
Boiler will not fi re
No power to LWCO
or OCP
Make sure that the LWCO is plugged into the OCP correctly and that all
wiring is correct. Make sure power to boiler is turned on.
Low water level
Make sure that the water level has reached the probe.
Air pocket at LWCO
probe
Turn off power to the boiler and slowly loosen, but do not remove
the probe. Allow any air to escape until water seeps past the probe’s
threads. Promptly re-lighten the probe and supply power to the boiler.
Dirty probe
Fluxes or oils used during the construction of the boiler or installation
of system piping can coat the probe, preventing signals from being
received by the LWCO. Add a cleaning solution, (such as water and
trisodium phosphate or consult the boiler manufacturer), to the system.
Heat and circulate this solution for at least one hour before draining and
completely fl ushing the system with clean water. Remove the probe and
thoroughly wipe it with a clean rag. Refi ll the system and test for proper
operation.
Improper ground
Make sure the probe is electrically connected to the ground connection
on the OCP.
Improper wiring
Check all wiring to the OCP and LWCO probe connection and refer to
the wiring diagrams. Using a multi-meter, verify that incoming power is
24 VAC.
Failed control
If the “Low Water” LED blinks RED, the safety circuits in the LWCO have
detected a failure in the control. To remove any temporary conditions,
turn off the power. After 30 seconds, restore the power. If the “Low
Water” LED continues to blink RED, the control must be replaced.
Boiler will not
shutdown
Shorted probe
Turn off power to the boiler and remove the probe. Verify that there is at
least ¼” clearance from all metal surfaces to the metal probe. Metal from
the boiler or piping must not come in contact with the metal probe.
Improper wiring
Check wiring to the probe and refer to the wiring diagrams. Using a
multi-meter, make sure that incoming power to the OCP is 24 VAC.
Amber “SERVICE”
LED is on
Dirty probe
Deposits form over time in the system and can coat the probe,
preventing signals from being received by the LWCO. Remove the probe
and thoroughly wipe it with a clean rag. Refi ll the system and test for
proper operation. It may be necessary to clean the boiler and piping as
noted above.
U. S. Boiler Company, Inc.
P.O. Box 3079
Lancaster, PA 17604
Manufactured by Potter Electric Signal Company, St. Louis, MO