Algas-SDI Operation and Maintenance Manual - SH100-SH200
5-1
5. Troubleshooting
Troubleshooting Procedures
Potential Problem
Possible Cause
Proposed Solution
Cannot initiate Start-up
sequence.
Air pressure switch has not
made contact.
Check air pressure switch
adjustment. Check blower
rotation. Check loading line
pressure at the ratio regulator.
Malfunction of flame monitoring
control system, such as shorted
out flame sensor or electrical
noise in sensor line.
Have a qualified electrician
investigate and solve.
Flame safety purge cycle not
completed.
Check flame monitoring control
system or purge timing.
Main power is off.
Verify power to control system is
on.
No power to control unit.
Have qualified electrician
investigate and solve.
High gas pressure switch has
activated.
Check incoming gas pressure.
Adjust gas pressure if
necessary. Check pressure
switch setting and operation.
Low gas pressure switch has
activated.
Check incoming gas pressure.
Adjust gas pressure if
necessary. Check pressure
switch setting and operation.
Start-up sequence runs but
burner does not light.
Not enough gas: Air in the gas
line.
Check output from flame safety.
Open gas ball valve. Purge gas
line.
Not enough gas: Gas valve not
open.
Check wiring to the automatic
gas shut-off valve.
Not enough gas: Gas solenoid
valve does not open.
Check solenoid valve coil for
proper orientation. Replace if
needed.
Not enough gas: Loading line to
ratio regulator not attached.
Reconnect loading line and
verify loading pressure.
No ignition: The igniter is not
correctly grounded to burner.
Clean the threads of the igniter
and the burner. Do not apply
grease to the thread of the spark
plug.
No ignition: The igniter is fouled. Clean the igniter.
No ignition: Open circuit
between the ignition transformer
and the igniter.
Repair or replace the wiring to
the igniter.
No ignition: There is no power to
the ignition transformer.
Restore power to the ignition
transformer.
