A.O. Smith XB-1000 Instruction Manual page 70

CODE
Fan Parameter Errors
74 Periodic Forced Recycle
75 Absolute max fan speed was out of range
76 Absolute min fan speed was out of range
77 Fan gain down was invalid
78 Fan gain up was invalid
79 Fan minimum duty cycle was invalid
80 Fan pulses per revolution was invalid
81 Fan PWM frequency was invalid
82-83 RESERVED
Modulation Parameter Errors
84 Lead Lag CH 4-20 mA water temperature setting
85 No Lead Lag add stage error threshold was
configured
86 No Lead Lag add stage detection time was
configured
87 No Lead Lag drop stage error threshold was
configured
88 No Lead Lag drop stage detection time was
configured
89 RESERVED
90 Modulation output type was invalid
91 Firing rate control parameter was invalid
92 Forced rate was out of range vs. min/max
modulation
93 Forced rate was invalid, % vs. RPM
94 Slow start ramp value was invalid
95 Slow start degrees value was invalid
96 Slow start was ended due to outlet sensor fault
97 Slow start was end due to reference setpoint fault
98 CH max modulation rate was invalid, % vs. RPM
99 CH max modulation rate was > absolute max rate
100 CH modulation range (max minus min) was too
small (< 4% or 40 RPM)
101 DHW max modulation rate was invalid, % vs.RPM
102 DHW max modulation rate was > absolute max
rate
103 DHW modulation range (max minus min) was too
small (< 4% or 40 RPM)
104 Min modulation rate was < absolute min rate
105 Min modulation rate was invalid, % vs. RPM
106 Manual rate was invalid, % vs. RPM
107 Slow start enabled, but forced rate was invalid
108 Analog output hysteresis was invalid
109 Analog modulation output type was invalid
110 IAS open rate differential was invalid
111 IAS open step rate was invalid
112 MIX max modulation rate was invalid, % vs. RPM
113 MIX max modulation rate was >absolute max or <
absolute min rates
DESCRIPTION CODE
114 MIX modulation range (max minus min) was too
small (< 4% or 40 RPM)
Modulation Operation Faults
115 Fan was limited to its minimum duty cycle
116 Manual rate was > CH max modulation rate
117 Manual rate was > DHW max modulation rate
118 Manual rate was < min modulation rate
119 Manual rate in Standby was > absolute max rate
120 Modulation commanded rate was > CH max
modulation rate
121 Modulation commanded rate was > DHW max
modulation rate
122 Modulation commanded rate was < min
modulation rate
123 Modulation rate was limited due to outlet limit
124 Modulation rate was limited due to Delta-T limit
125 Modulation rate was limited due to stack limit
126 Modulation rate was limited due to
anticondensation
127 Fan Speed out of range in RUN
128 Modulation rate was limited due to IAS was open
129 Slow start ramp setting of zero will result in no
modulation rate change
130 No forced rate was configured for slow start ramp
CH parameter Errors
131 CH demand source was invalid
132 CH P-gain was invalid
133 CH I-gain was invalid
134 CH D-gain was invalid
135 CH OFF hysteresis was invalid
136 CH ON hysteresis was invalid
137 CH sensor type was invalid
138 CH hysteresis step time was invalid
139 CH remote control parameter was invalid
140 CH ODR not allowed with remote control
141 Steam P-gain was invalid
142 Steam I-gain was invalid
143 Steam D-gain was invalid
144 Steam OFF hysteresis was invalid
145 Steam ON hysteresis was invalid
CH Operation Faults
146 CH control was suspended due to fault
147 CH header temperature was invalid
148 CH outlet temperature was invalid
149 CH steam pressure was invalid
CH Parameter errors (continued)
150 Steam setpoint source parameter was invalid
151 Minimum water temperature parameter was
greater than setpoint
70
DESCRIPTION