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CHECK THAT CIRCUIT BREAKERS IS ON OR
FUSES ARE OK AT THE ELECTRICAL PANEL
CHECK THAT SERVICE SWITCH IS ON
OK
ON
NO
CHART 1
CHECK CASTING TEMPERATURE SAFETY
SWITCH. PUSH RESET BUTTON ON SWITCH.
CONTACTS OPEN (BUTTON UP) OR CLOSED
(BUTTON DOWN)?
CLOSED
CHECK WIRING TO IBC. I20 VAC BETWEEN
TERMINALS 1 AND 3 AT WIRING HARNESS
PLUG CN7?
YES
120 VAC BETWEEN TERMINALS 1 AND 3 AT
CONNECTOR CN3 OR IBC?
YES
120 VAC AT TRANSFORMER PRIMARY
TERMINALS?
YES
24 VAC AT TRANSFORMER SECONDARY
TERMINALS?
YES
YES
24 VAC AT WIRING HARNESS PLUG CN2?
REPLACE IBC
NO
NO
NO
NO
REPLACE IBC
REPAIR WIRING TO TRANSFORMER
REPLACE TRANSFORMER
PUSH RESET BUTTON ON CASTING TEMP
SAFETY SWITCH. CHECK CONTINUITY OF
CASTING TEMP. SAFETY SWITCH CONTACTS.
CONACTS OPEN OR CLOSED?
CLOSED
OPEN
REPLACE CAST. TEMP.
SAFETY SWITCH.
REPLACE/REPAIR WIRING FROM
TRANSFORMER TO IBC
REPLACE IBC
REPLACE/REPAIR WIRING FROM IBC TO
CIRCULATOR
NO
NO
YES
YES
NO
CHART 1
CHECK FOR 120 VAC BETWEEN TERMINALS 1
AND 3 AT CONNECTOR CN5 ON IBC?
CHECK FOR 120 VAC AT CIRCULATOR
REPAIR/REPLACE CIRCULATOR
TROUBLESHOOTING CHART 2
NO
OPEN
REPLACE/REPAIR WIRING FROM SERVICE
SWITCH TO IBC
CHECK WATER LEVEL IN BOILER. CHECK
FOR AIR TRAPPED IN TOP OF BOILER.
CONTACTS WILL NOT STAY CLOSED UNTIL
BOILER COOLS OFF.
TROUBLESHOOTING
A99352
Fig. 28
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Troubleshooting Chart No. 2