American Standard YCZ036F1/3M0B Installation Operation & Maintenance page 21

IGN LED DIAGNOSTIC INDICATOR
FLASHING SLOW NORMAL CALL FOR HEAT
CONTINUOUS ON NORMAL
CONTINUOUS OFF CHECK POWER / INTERNAL FAILURE
2 FLASHES SYSTEM LOCKOUT ( NO FLAME )
3 FLASHES PRESSURE SWITCH PROBLEM
4 FLASHES HIGH LIMIT (TCO) OPEN
5 FLASHES FLAME SENSED WITH GAS VALVE OFF
6 FLASHES FLAME ROLLOUT SWITCH (FL) OPEN
7 FLASHES W1 & W2 SWAPPED
CHECKOUT PROCEDURE
(_ TROUBLESHOOTING CHART
................. u:7 . .......................................... :....
Liquid Pressure Too high P S P S S
SP SS S
S PP SP
S SPS
SS
P SS SP
P PS
SP PS SPS
Liquid Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrigerant floodback (TXV System)
Liquid Refrig. floodback (Cap. Tube System)
I. D. Coil Frosting
Compressor Runs Inadequate or No Cooling
ELECTRICAL
Compressor & O.D. fan Do Not Start P P S P P P
CompressorWill Not Start But O.D. Fan Runs P S P P P S
O.D. Fan Won't Start p p
Compressor Hums ButWill Not Start p P P P S S
Compressor Cycles on IOL p S P P P S P S P S S S S S
I.D. BIowerWon't Start P S S P P
P-PRIMARY CAUSES S-SECONDARY CAUSES X66,€590
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