Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 87

MagnaTherm Boilers and Water Heaters
Code Description
155 Purge fan switch OFF
156 Combustion pressure and flame ON
157 Combustion pressure and flame OFF
158 Main valve ON
159 Main valve OFF
160 Ignition ON
161 Ignition OFF
Lockout Procedure
or Hold
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.
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.
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.
L 1. Check Main Valve terminal wiring and correct
any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
L 1. Check Main Valve terminal wiring and correct
any errors.
2. Reset and sequence the module. If fault
persists, replace the module.
L 1. Check Ignition terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault
persists, replace the module.
L 1. Check Ignition terminal wiring and correct any
errors.
2. Reset and sequence the module. If fault
persists, replace the module.
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