Algas-SDI Operation and Maintenance Manual - VH100-VH200
5-1
5. Troubleshooting
Troubleshooting Procedures
Potential Problem
Possible Cause
Proposed Solution
Cannot initiate Start-up
sequence.
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.
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: The gas
pressure out of the main gas
pressure regulator is too low.
Check start-up setting. Check
regulator and adjust if
necessary.
Too much gas: Gas pressure
out of the main gas pressure
regulator is too high.
Check start-up setting. If
needed, remove regulator and
investigate.
Too much gas: Manual gas
butterfly valves have been
opened too far.
Check pressure and setting
against spec sheet and adjust
accordingly.
Too much gas: Improper gas
valve train sequence.
Verify solenoid valve is down-
stream of ratio regulator.
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.
