
26
Is visual/audible alarm flashing/pulsing once?
Is a low water cut-of
f
installed?
Safety Switch Fault.
Remove leads from HL-HL
terminals on control board
and test with a jumper
.
Does visual/audible alarm
shut of
f with jumper in
-
stalled?
Is visual/audible alarm flashing/pulsing three
times?
Is visual/audible alarm
flashing/pulsing four times?
Is visual/audible alarm flashing/pulsing twice?
Stuck/welded element relay
contact. Replace electric
boiler control board.
R
TD short. Follow steps on page 10 to check R
TD and
replace if necessary
.
R
TD open. Follow steps on page 10 to check R
TD and
replace if necessary
.
Yes
Yes
Yes
Yes
N
o
N
o
N
o
Remove jumper from HL-HL
terminals and re
-
place leads.
N
o
OK
OK
Yes
OK
OK (See
Flowchart#4)
Remove leads from
LWC-L
WC and test with a
jumper
.
Replace high limit control
switches.
Is a flow switch installed?
N
o
N
o
Yes
Yes
(From Flow
-
chart#1)
Yes
A
B
C
TrouBLEsHooTing - fLoWcHArT#3