LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 81)

MagnaTherm Boilers and Water Heaters Page 77
Code Description Lockout
or Hold
Procedure
155 Purge fan switch OFF H or L 1. Purge fan switch is off when it should be on.
2. Check wiring and correct any errors.
3. Inspect the Purge Fan switch J6 terminal 3 and
its connections. Make sure the switch is working
correctly and is not jumpered or welded.
4. Reset and sequence the relay module.
5. If the fault persists, replace the relay module.
156
Combustion pressure and flame ON
H or L
1. Check that flame is not present in the
combustion chamber. Correct any errors.
2. Make sure that the flame detector is wired to
the correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the flame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
157
Combustion pressure and flame OFF
L
1. Check that flame is not present in the
combustion chamber. Correct any errors.
2. Make sure that the flame detector is wired to
the correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the flame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
158 Main valve ON L 1. Check Main Valve terminal wiring and correct
any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
159 Main valve OFF L 1. Check Main Valve terminal wiring and correct
any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
160 Ignition ON L 1. Check Ignition terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault
persists, replace the module.
161 Ignition OFF L 1. Check Ignition terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault
persists, replace the module.