© 2022 Staheli West
142
Faults
Fault 200: High Pressure Limit Switch (HPLS) Is Tripped
The
high pressure limit switch shuts off the burner anytime it is tripped; it trips anytime boiler pressure is
over 15 psi.
Causes
Troubleshooting
Fixes
• Wet Layup (causes more than
15 psi in the boiler).
• Have you performed a Wet
Layup recently? (Wet Layup fills
the boiler completely full of
water)
• Manually reset
switch.
• 1 or more pigtail valves are
open.
• Steam can be seen coming out
of the front supply water tanks.
• Close the open pigtail valves
(don’t forget the one behind the
manual psi gauge).
• High pressure limit switch faulty
or out of calibration.
• Perform “Test 8”.
• Adjust the calibration nut to 15
psi.
• Replace high pressure limit
switch.
• Operating pressure control
switch faulty or out of calibration.
• Perform “Test 9”.
• Adjust the calibration nut to
14.5 psi.
• Replace operating pressure
control switch.
• Faulty SR-4 relay (Panel 1) Fault
243.
• Swap SR-4 with spare 120 V relay (Panel 1).
• Faulty wiring.
• Inspect the wiring for ground,
continuity, and proper voltage.
• Replace/Repair wiring.