79
Outlet high limit
80
DHW (Domestic Hot Water) high limit
81
Delta T limit
82
Stack limit
91
Inlet sensor fault
92
Outlet sensor fault
93
DHW (Domestic Hot Water) sensor fault
94
Header sensor fault
95
Stack sensor fault
96
Outdoor sensor fault
97
Internal Fault: A2D mismatch.
98
Internal Fault: Exceeded VSNSR
voltage tolerance
99
Internal Fault: Exceeded 28V voltage
tolerance
H or L
1. Check wiring and correct any possible errors.
2. Replace the outlet high limit.
3. If previous steps are correct and fault persists,
replace the module.
H or L
1. Check wiring and correct any possible errors.
2. Replace the DHW high limit.
3. If previous steps are correct and fault persists,
replace the module.
H or L
1. Check inlet and outlet sensors and pump
circuits for proper operation.
setting.
3. If previous steps are correct and fault persists,
replace the module.
H or L
1. Check wiring and correct any possible errors.
2. Replace the Stack high limit.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the Inlet sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the Outlet sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the DHW sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the header sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the stack sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
1. Check wiring and correct any possible errors.
2. Replace the outdoor sensor.
3. If previous steps are correct and fault persists,
replace the module.
L
Internal Fault.
L
1. Reset module.
L
2. If fault repeats, replace module.
Page 89