LAARS NeoTherm NTV1000 - Install and Operating Manual - Manual (Page 114)

LAARS Heating Systems
Page 110
Code Description L or
H
Procedure
153 Combustion Pressure Off H or
L
1. Check wiring and correct any errors.
2. Inspect the Combustion Pressure Switch to
make sure it is working correctly.
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure
the voltage between J6 terminal 5 and L2 (N).
Supply voltage should be present. If not, the
lockout switch is defective and needs replacing.
5. If the fault persists, replace the relay module.
154 Purge Fan switch On 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 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.
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.