LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 77)

MagnaTherm Boilers and Water Heaters Page 73
Code Description Lockout
or Hold
Procedure
79 Outlet high limit 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.
80 DHW (Domestic Hot Water) high limit 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.
81 Delta T limit H or L 1. Check inlet and outlet sensors and pump
circuits for proper operation.
2. Recheck the Delta T Limit to confirm proper
setting.
3. If previous steps are correct and fault persists,
replace the module.
82 Stack limit 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.
91 Inlet sensor fault 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.
92 Outlet sensor fault 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.
93 DHW (Domestic Hot Water) sensor fault 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.
94 Header sensor fault 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.
95 Stack sensor fault 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.
96 Outdoor sensor fault 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.