Troubleshooting
Algas-SDI Operation and Maintenance Manual - SH100-SH200
5-2
Potential Problem
Possible Cause
Proposed Solution
Start-up sequence runs but
burner does not light.
(continued)
No ignition: Attempting to ignite
at inputs greater than 40%.
Reduce start point gas flow.
Verify control circuit.
No ignition: Weak or non-
existent spark.
Verify ignition transformer is a
6000 VAC transformer.
No flame signal: Broken flame
rod or dirty UV scanner lens.
Inspect and clean flame
supervision. Replace if
necessary.
No flame signal: Flame rod
grounding out.
Verify that the flame rod is
installed correctly and is the
correct length.
Too much gas: Wrong or
missing burner fuel orifice.
Check the Phoenix SH
specification sheet for fuel
orifice for given fuel.
The low fire flame is weak or
unstable.
Low fire adjusted too low.
Increase low fire gas setting.
Not enough gas.
Check start-up settings and
adjust to increase low gas flow.
Not enough air.
Check start-up settings. Check
air plumbing, controls, and
valves for leaks.
The burner turns off when
cycling to high fire.
Fuel rich mixture.
Check start-up settings. Check
air plumbing, controls, and
valves.
Loading line to the ratio
regulator is leaking.
Repair the lead in the loading
line.
The burner is unstable or
produce soot and/or smoke.
The air/gas ratio is incorrect.
Measure all gas pressures and
air pressures. Compare to initial
start-up settings and adjust as
necessary.
The burner is not performing as
specified and does not respond
to adjustment.
Weak flame signal.
Check condition of flame
monitoring device.
Internal damage to the burner.
Parts loose or dirty within the
burner.
Contact Algas-SDI.
Cannot achieve full burner
capacity.
Air filter is blocked.
Clean or replace air filter.
Increased furnace chamber
pressures.
Re-check setup pressures and
compare to specification sheet.
Gas pressure is too low into the
main gas pressure regulator.
Adjust gas pressure.
