6
TROUBLESHOOTING
TESTING
Problem:
1. Burner does not shut off on low water.
a.
Cause:
Float chamber is loaded with mud or
sediment.
Test:
With water level below the control
check if terminals C and N.C. are open.
If not, remove switch and manually test
if terminals C and N.C. can be opened.
Solution:
Open float chamber and clean. At this
time, check for a build-up of scale or
sediment between corrugations of the
bellows.
b.
Cause:
Contacts are fused together.
Test:
Remove switch and operate manually to
verify proper switch operation.
Solution:
Replace switch. Check electrical load
and make sure it is within the ratings
of the switch.
CUT OFF
LEVEL
TEST
OPENING
• Control can be tested on a hot water
boiler by gently inserting a screwdriver
or similar tool in the test opening below
the switch (see drawing) and lifting linkage
to cause float to drop, thereby simulating a
low water condition.