John Wood Commercial - AJWSC - Manual (Page 26)

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IX) TROUBLESHOOTING GUIDE
Detect Conditions Alarm (ERROR) Name Control Action
Service
Suggestion (After
Error Matured)
Detection
Time
Remote
Display
Flame current lower
than threshold. FLAME_CURRENT Normal. Clean flame rod. Flame sensing
active. FlameSenseCur
rentLow
Damper END SW
failed to close
(stuck open). DAMPER_SW_CLOSE Wait until closed. Check END SW. In an IGN
cycle. alarm #
Damper END SW
failed to open (stuck
closed). DAMPER_SW_OPEN Wait until open. Check END SW. In an IGN
cycle. DamperEndSwit
chOpen
Flame rod to ground
leakage resistance
< ~200K (AC
voltage dependent). ROD_SHORT WaitForRecovery
state. Resume
normal operation
when debounced
normal. Check flame rod. Flame drive
inactive. alarm #
Line voltage power
issues, too noisy, or
frequency out of
normal range. ZERO_CROSSING WaitForRecovery
state. Resume
normal operation
when debounced
normal. Check AC input. All time. alarm #
Line voltage
low/high. AC_LINE WaitForRecovery
state. Resume
normal operation
when debounced
normal. Check AC input. All time. alarm #
Sensor 2 (averaging
sonsor) resistance
out of acceptable
range SENSOR2 WaitForRecovery
state. Resume
normal operation
when debounced
normal. Replace optional
sensor. All time. UpperSensor
Sensor 1 (limit
sonsor) resistance
out of acceptable
range SENSOR1 WaitForRecovery
state. Resume
normal operation
when debounced
normal. Replace limit
sensor. All time. LowerSensor
DCDC output
unstable. POWER WaitForRecovery
state. Resume
normal operation
when debounced
normal. Check AC input. If
stable, replace
control. When flame
sensing active. alarm #
Retry>max.
detected by IGN
state machine. SLO_RETRY Soft lockout. Check gas supply,
burner and
harness. When heating
required. SoftLockout
Recycle > max.
detected by IGN
state machine. SLO_RECYCLE Soft lockout. Check gas supply,
burner and
harness. When heating
required. SoftLockout
Table 6 Error Codes