Kenmore K90-150 Owner's Manual page 38

TROUBLESHOOTING CHART #6
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CHART5
YES
F
+
SET THERMOSTAT BELOW ROOM
TEMPERATURE TO END CALL FOR
HEAT
YES
DOES CIRCULATOR PUMP STOP?
¶LYES
VALE LIGHT IS OFF
_YES
DOES DRAFT BLOWER
STOP AFTER 30
SECOND POST PURGE?
_YES
SYSTEM OK
CHART 5
NO #3
CHART5
I NO #2
RUNS FOR 25-_ SECONDS,
THEN TURNS OFF.
CHECK FIRING RATE OF UNIT.
IS UNIT FIRING AT THE CORRECT RATE?
¶L YES
CHECK BURNER FOR ANY DETERIORATION
IN THE FLAME PORTS, ARE BURNER PORTS
IN GOOD CONDITION,
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REPLACE GAS CONTROL. i
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YES
CHECK GAS ORFICICE SIZE.
IS GAS ORIFICE SIZE CORRECT
CHECK REPAIR PARTS LIST
FOR CORRECT SIZE, IS GAS ORIFICE
CLEAR OF BLOCKAGE,
rYES
DOES THE UNIT USE LP GAS
NO
ADJUST RATE AS DESCRIBED IN THE
CHECK OUT PROCEDURE AND
ADJUSTMENT SECTION
OF THE MANUAL.
REPLACE WITH CORRECT
AIR BAFFLE.
_P
BOILER SHUTS OFF BEFORE END OF
CALL FOR HEAT ARE HI LIMIT
AQUASTAT CONTACTS CLOSED?
YES
SEE TROUBLESHOOTING PATH I
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#2 ABOVE
YES
CHECK FLAME SIGNAL • 0.6uA? 'sO=INI-"_ _
CONSULT BOILER MFGR. FOR
SPECIFIC INSTRUCTIONS. REQUIRES
SPECIFIC TOOLS.
BOILER OFF ON HIGH LIMIT. IS
ACTUAL BOILER WATER TEMP.
GREATER THAN HI LIMIT SET POINT
MINUS 30°F CONTROL DIFFERENTIAL?
REPLACE BURNER
REPLACE IBC
NNNo_ REPLACE
AQUASTAT
OK
ARE THERMOSTAT CONTACTS OPEN? I_
_YES
I REPLASE,SC I
REMOVE WIRING HARNESS ___
CONNECTION CN9 FROM GAS
CONTROLDOESGASCONTROL
CLOSE?
_YES
REPLACE IBC I
REPLACE THERMOSTAT
REPLACE GAS CONTROL
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