Laars MagnaTherm MGH1600 Installation And Operation Instructions For page 98

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149 Flame detected
150 Flame not detected
154 Purge Fan switch On
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
164 Block intake ON
165 Block intake OFF
172 Main relay feedback incorrect
174 Safety relay feedback incorrect
175 Safety relay open
176 Main relay ON at safe start check
178 Safety relay ON at safe start check
H or L Holds if flame detected during Safe Start check up
to Flame Establishing period.
H Sequence returns to standby and restarts
sequence at the beginning of Purge after the HF
switch opens if flame detected during Safe Start
check up to Flame Establishing period.
H or L 1. Purge fan switch is on when it should be off.
2. Check wiring and correct any errors.
3. Inspect the Purge Fan switch J6 terminal 3
and its connections. Make sure the switch
H or L
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
L
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.
L
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
L
persists, replace the module.
L 1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure it
is working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the
L
voltage across the switch. Supply voltage
should be present. If not, the Block Intake
Switch is defective and needs replacing.
5. If the fault persists, replace the relay module.
L
L Internal Fault.
L 1. Reset module.
L 2. If fault repeats, replace module.
L
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