Argo AT Series - Troubleshooting - Flowchart#3; Alarm Codes and Safety Switch Checks; High Limit and Low Water Cut-off Checks

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TROUBLESHOOTING - FLOWCHART#3
Is visual/audible alarm
ashing/pulsing once?
Is a low water cut-off
installed?
Safety Switch Fault.
Remove leads from HL-HL
terminals on control board
and test with a jumper.
Does visual/audible alarm
shut off with jumper in-
stalled?
Is visual/audible alarm
ashing/pulsing three
times?
Is visual/audible alarm
ashing/pulsing four times?
Is visual/audible alarm
ashing/pulsing twice?
Stuck/welded element relay
contact. Replace electric
boiler control board.
RTD short. Follow steps on
page 10 to check RTD and
replace if necessary.
RTD open. Follow steps on
page 10 to check RTD and
replace if necessary.
Yes Yes
Yes Yes
No
No
No
Remove jumper from
HL-HL terminals and re-
place leads.
No
OK
OK
Yes
OK
OK (See
Flowchart#4)
Remove leads from
LWC-LWC and test with a
jumper.
Replace high limit control
switches.
Is a ow switch installed?
No No
Yes
Yes
(From
Flow-
chart#1)
Yes
A
B C